A wind power blade inner cavity air pressure balancing device

Abstract

This invention provides a wind turbine blade internal pressure balancing device. It is mounted on and passes through the rear cover or manhole cover of the wind turbine blade, and includes a first breather and a second breather. The first and second breathers are internally connected. One end of the first breather is located outside the rear cover or manhole cover, and the other end extends through the rear cover or manhole cover into the blade. The second end of the first breather is connected to the second breather. Ventilation holes are provided on both the first and second breathers, forming a ventilation structure. A first sieve plate is fitted onto the first end of the first breather, and a second sieve plate is installed at the end of the second breather furthest from the first breather. With the outside atmosphere connected, this effectively prevents adhesive particles or internal water from entering the generator set. The device is simple in structure and quick and convenient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power blade equipment, in particular to a wind power blade internal cavity air pressure balancing device. BACKGROUND

[0002] With the continuous development and reduction of high-quality wind resources on land, offshore wind power has become the main development direction in the field of wind power. The development of offshore wind power leads to the increasing length and volume of wind power blades, which results in the increasing deformation of the internal cavity of the blade during operation, and the internal air pressure changes constantly with the deformation of the blade, which has a certain adverse effect on the fatigue life and power generation efficiency of the blade. Therefore, the inside of the blade needs to be connected with the outside air to balance the internal air pressure. However, the common air pressure balancing means for the blade at present is to use the blade tip drain hole to communicate with the outside atmosphere or to make an opening on the root rear cover plate. However, the wind power blade is mainly made of half pieces which are bonded, and it is inevitable to perform polishing and bonding operations. The dust and adhesive inside the blade gradually increase with the operation of the blade, which easily causes the blockage of the blade tip drain hole. Drainage hole dredging is also a common maintenance content of wind power blades. Making an opening on the root rear cover plate easily causes the falling and flowing out of internal adhesive particles and water, which will cause major safety hazards to the generator set if they fall into the blade generator set during the operation of the blade. Therefore, how to set a wind power blade internal cavity air pressure balancing device to ensure the normal and stable operation of the wind power blade is a problem to be solved in the field. SUMMARY

[0003] Therefore, the present application aims to provide a wind power blade internal cavity air pressure balancing device to solve the problems of the blockage of the blade tip drain hole, the falling and flowing out of internal adhesive particles and water, the influence on the operation stability of the generator set, and the major safety hazards caused by the opening of the blade tip or the root rear cover plate in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The application discloses a kind of wind power blade inner cavity air pressure balancing device, air pressure balancing device is arranged on the back cover plate or manhole cover of wind power blade and passes through the back cover plate or manhole cover, the air pressure balancing device includes first breather and second breather, the first breather and second breather are communicated, the first end of the first breather is located outside the back cover plate or manhole cover, the second end of the first breather is inserted into the blade inside by the back cover plate or manhole cover, and the second end of the first breather is connected with the second breather, first air hole is arranged on the first end of the first breather, second air hole is arranged on the end of the second breather away from the first breather, first sieve plate is sleeved on the first end of the first breather, the first sieve plate is arranged as loop structure, the first sieve plate is wrapped outside the first air hole, the two ends of the first sieve plate form closed structure, the second sieve plate is arranged on the end of the second breather away from the first breather, the second sieve plate is arranged as loop structure, the second sieve plate is wrapped outside the second air hole, and the first air hole, first breather and second breather inside, second air hole form air structure.

[0006] Further, the first breather includes first air pipe, the first air pipe is arranged as tubular structure, one end of the first air pipe is provided with first air hole, the first air hole is provided with a plurality of, a plurality of the first air hole is arranged on the outer circumferential axis of the first air pipe, the first sieve plate is arranged on the one end of the first air pipe corresponding to first air hole, and the first sieve plate is coaxially arranged with the first air pipe.

[0007] Further, the two ends of the first sieve plate are connected with the first air pipe by first baffle, and the first baffle is arranged as closed plate structure.

[0008] Further, first connecting thread is arranged on the end of the first air pipe away from first air hole, and the first breather is connected with the second breather by the first connecting thread.

[0009] Further, the second breather includes second air pipe, the second air pipe is arranged as tubular structure, one end of the second air pipe is provided with second air hole, the end of the second air pipe away from the second air hole is connected with the first air pipe of the first breather, the second sieve plate is arranged on the one end of the second air pipe corresponding to the second air hole, and the second sieve plate is coaxially arranged with the second air pipe.

[0010] Further, the two ends of the second sieve plate are connected with the second air pipe by second baffle, and the second baffle is arranged as closed plate structure.

[0011] Further, the second ventilation pipe is provided with a second connecting thread at one end away from the second ventilation hole, and the second respirator is connected with the first respirator through the second connecting thread.

[0012] Further, a connecting structure is arranged at the connecting part of the first respirator and the rear cover plate or manhole cover, and the connecting structure is arranged on the side of the rear cover plate or manhole cover facing the second respirator.

[0013] Further, a waterproof structure is arranged at the connecting part of the first respirator and the rear cover plate or manhole cover, and the waterproof structure is arranged as a sealing assembly.

[0014] Further, the length of the first respirator is greater than the length of the second respirator.

[0015] Compared with the prior art, the wind power blade inner cavity air pressure balancing device has the following advantages:

[0016] In the case of communicating with the outside atmosphere, the adhesive particles or internal water accumulation into the generator set is effectively avoided, and the structure is simple, quick and convenient to install; the present application can be modified and processed by using the drainage cap on the market, and the rest is composed of standard parts, which is low in cost; it has strong applicability and can be applied to wind power blades of different specifications, and the installation position can be selected flexibly according to actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The long respirator axial view according to the embodiment of the present application;

[0018] Fig. 2 The long respirator side view according to the embodiment of the present application;

[0019] Fig. 3 The long respirator cross-sectional view according to the embodiment of the present application;

[0020] Fig. 4 The short respirator axial view according to the embodiment of the present application;

[0021] Fig. 5 The short respirator side view according to the embodiment of the present application;

[0022] Fig. 6 The short respirator cross-sectional view according to the embodiment of the present application;

[0023] Fig. 7 The air pressure balancing device and the rear cover plate assembly schematic view according to the embodiment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1a. First sieve plate; 1b. Second sieve plate; 2a. First vent pipe; 2b. Second vent pipe; 3. First connecting thread; 4. Second connecting thread; 5a. First vent hole; 5b. Second vent hole; 6. First respirator; 7. Rear cover plate; 8. Flat washer; 9. Spring washer; 10. Self-locking nut; 11. Second respirator; 12. Rubber washer; 13. Sealing silicone; 14. First baffle; 15. Second baffle. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] like Figs. 1-7 As shown, a pressure balancing device for the inner cavity of a wind turbine blade is disclosed. The pressure balancing device is installed on and passes through the rear cover plate 7 of the wind turbine blade. The pressure balancing device includes a first breather 6 and a second breather 11, which are internally connected. The first end of the first breather 6 is located outside the rear cover plate 7, and the second end of the first breather 6 extends through the rear cover plate 7 into the interior of the blade. The second end of the first breather 6 is connected to the second breather 11. A first vent 5a is provided on the first end of the first breather 6. The second breather 11 is located away from the second breather 11. A second vent 5b is provided at one end of the first breather 6. A first sieve plate 1a is fitted onto the first end of the first breather 6. The first sieve plate 1a is configured as a loop structure, covering the outside of all the first vents 5a. The two ends of the first sieve plate 1a form a closed structure. A second sieve plate 1b is provided at the end of the second breather 11 away from the first breather 6. The second sieve plate 1b is configured as a cylindrical loop structure, covering the outside of all the second vents 5b. The first vents 5a, the interior of the first breather 6 and the second breather 11, and the second vents 5b form a ventilation structure. The ventilation structure allows the blade cavity to communicate with the outside atmosphere, balancing the internal air pressure of the blade. The first sieve plate 1a and the second sieve plate 1b effectively protect the vents, preventing adhesive particles from entering the blade or clogging the vents, thus fully ensuring the operational stability of the blade and the generator set.

[0028] The first respirator 6 includes a first ventilation tube 2a, which is configured as a tubular structure. One end of the first ventilation tube 2a has a first ventilation hole 5a, and multiple first ventilation holes 5a are axially arranged around the outer circumference of the first ventilation tube 2a. A first sieve plate 1a is disposed on the first ventilation tube 2a corresponding to one end of the first ventilation hole 5a. The first sieve plate 1a is coaxially arranged with the first ventilation tube 2a. Both ends of the first sieve plate 1a are connected to the first ventilation tube 2a via a first baffle 14. The first baffle 14 is configured as a sealed plate structure, ensuring that both ends of the first sieve plate 1a form a sealed structure, preventing adhesives and accumulated water from entering the interior of the first respirator 6 through the first sieve plate 1a.

[0029] In this embodiment, the first sieve plate 1a can be configured as a cylindrical or cuboid-shaped loop structure to protect the first vent 5a.

[0030] Furthermore, a first connecting thread 3 is provided at the end of the first ventilation tube 2a away from the first ventilation hole 5a, and the first respirator 6 is connected to the second respirator 11 through the first connecting thread 3.

[0031] The second respirator 11 includes a second ventilation tube 2b, which is a tubular structure. One end of the second ventilation tube 2b has a second ventilation hole 5b, and the end of the second ventilation tube 2b away from the second ventilation hole 5b is connected to the first ventilation tube 2a. Multiple second ventilation holes 5b are provided, axially arranged around the outer circumference of the second ventilation tube 2b. A second sieve plate 1b is disposed on the second ventilation tube 2b corresponding to one end of the second ventilation hole 5b. The second sieve plate 1b is coaxially arranged with the second ventilation tube 2b. Both ends of the second sieve plate 1b are connected to the second ventilation tube 2b via a second baffle 15. The second baffle 15 is a sealed plate structure, ensuring that both ends of the second sieve plate 1b form a sealed structure, preventing adhesives and accumulated water from entering the first respirator through the second sieve plate 1b and the second ventilation tube 2b.

[0032] Furthermore, a second connecting thread 4 is provided at the end of the second ventilation tube 2b away from the second ventilation port 5b, and the second respirator 11 is connected to the first respirator 6 through the second connecting thread 4.

[0033] Preferably, the first vent pipe 2a is provided with an external thread and the second vent pipe 2b is provided with an internal thread, thereby connecting the first and second breathers together, facilitating the installation and disassembly of the first breather, and enabling the cleaning and maintenance of the interior of the first and second breathers, improving the service life of the air pressure balancing device, and reducing the overall operation and maintenance burden of the wind turbine blades and generator sets.

[0034] In this embodiment, a connecting structure is provided at the connection between the first respirator 6 and the rear cover plate 7. The connecting structure is located on the side of the rear cover plate 7 facing the second respirator 11. The connection structure increases the connection stability between the first respirator and the rear cover plate 7 and prevents the first and second respirators from becoming loose.

[0035] A waterproof structure is also provided at the connection between the first breather 6 and the rear cover plate 7. The waterproof structure is a sealing component used to seal the gap between the connection between the first breather 6 and the rear cover plate 7, preventing water inside the blade from flowing to the blade generator through the connection between the first breather 6 and the rear cover plate 7.

[0036] Furthermore, the connection structure includes a flat washer 8, a spring washer 9, and a self-locking nut 10. The flat washer 8, spring washer 9, and self-locking nut 10 are all fitted onto the first ventilation tube 2a of the first respirator 6. The flat washer 8 is located on the side closer to the rear cover plate 7, the self-locking nut 10 is located on the side away from the rear cover plate 7, and the spring washer 9 is located between the flat washer 8 and the self-locking nut 10. The connection structure fixes the first respirator to the root of the blade, and all the connecting parts are common standard parts, reducing costs and improving installation and disassembly efficiency.

[0037] Furthermore, the waterproof structure includes a rubber gasket 12 and a sealing silicone 13. The rubber gasket 12 is disposed between the flat gasket 8 and the rear cover plate 7, and the sealing silicone 13 is disposed around the rubber gasket 12 and the flat gasket 8 to seal the gap between the rear cover plate and the first breather 6, thus fully preventing water leakage.

[0038] In this embodiment, preferably, the length of the first respirator 6 is greater than the length of the second respirator 11, that is, the first respirator 6 can be configured as a long respirator and the second respirator 11 can be configured as a short respirator.

[0039] The air pressure balancing device of this invention connects the inside of the blades to the outside atmosphere through the setting of two breathers. The breathers are divided into two parts and connected by bolts for easy installation. The dustproof mechanism prevents adhesive particles from entering through the screen plate of the small gap and the circuit mechanism. The screen plate and baffle can be modified from common drainage caps on the market to reduce costs. The waterproof mechanism uses rubber gaskets and sealing silicone to seal and prevent water from entering. Even if there is water inside the blades, it is not easy to enter the generator set through the vent pipe.

[0040] As one embodiment of the present invention, the air pressure balancing device can also be installed on the manhole cover of the blade as needed, as long as it can enable the air inside the blade to communicate with the outside air.

[0041] As part of the embodiments of the present invention, an installation procedure for a wind turbine blade internal cavity air pressure balancing device is also provided, as follows:

[0042] Make holes in the manhole cover or rear cover plate according to actual needs;

[0043] Insert the long respirator through the outside of the blade into the opening;

[0044] Insert rubber sealing rings, flat washers, and spring washers respectively, and tighten them with self-locking nuts to prevent the long breather from falling outside the blades;

[0045] Connect the threads of the short and long breathers and apply thread-locking adhesive to prevent the short breather from falling into the blades.

[0046] Use silicone sealant to seal the gaps and prevent water from seeping in.

[0047] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A wind turbine blade inner cavity air pressure balancing device, the air pressure balancing device is arranged on the back cover plate (7) or manhole cover of the wind turbine blade and passes through the back cover plate (7) or manhole cover, characterized in that, The air pressure balancing device comprises a first breather (6) and a second breather (11), the first breather (6) and the second breather (11) are internally communicated, the first end of the first breather (6) is located outside the back cover plate (7) or manhole cover, the second end of the first breather (6) penetrates into the blade inside through the back cover plate (7) or manhole cover, and the second end of the first breather (6) is connected with the second breather (11), a first air hole (5a) is arranged on the first end of the first breather (6), a second air hole (5b) is arranged on the end of the second breather (11) away from the first breather (6), a first sieve plate (1a) is sleeved on the first end of the first breather (6), the first sieve plate (1a) is arranged in a loop structure, the first sieve plate (1a) is wrapped outside the first air hole (5a), the two ends of the first sieve plate (1a) form a closed structure, a second sieve plate (1b) is arranged on the end of the second breather (11) away from the first breather (6), the second sieve plate (1b) is arranged in a loop structure, the second sieve plate (1b) is wrapped outside the second air hole (5b), the first air hole (5a), the first breather (6) and the second breather (11) inside and the second air hole (5b) form an air hole structure.

2. The wind turbine blade internal cavity air pressure equalization device of claim 1, wherein, The first breather (6) comprises a first air pipe (2a), the first air pipe (2a) is arranged in a tubular structure, one end of the first air pipe (2a) is provided with a first air hole (5a), the first air hole (5a) is arranged in a plurality of forms, a plurality of first air holes (5a) are arranged on the outer circumferential axis of the first air pipe (2a), the first sieve plate (1a) is arranged on one end of the first air pipe (2a) corresponding to the first air hole (5a), and the first sieve plate (1a) is coaxially arranged with the first air pipe (2a).

3. The wind turbine blade internal cavity air pressure equalization device of claim 2, wherein, The two ends of the first sieve plate (1a) are connected with the first air pipe (2a) through a first baffle (14), and the first baffle (14) is arranged in a closed plate structure.

4. The wind turbine blade internal cavity air pressure equalization device of claim 2, wherein, A first connecting thread (3) is arranged on the end of the first air pipe (2a) away from the first air hole (5a), and the first breather (6) is connected with the second breather (11) through the first connecting thread (3).

5. The wind turbine blade internal cavity air pressure equalization device of claim 1, wherein, The second breather (11) comprises a second air pipe (2b), the second air pipe (2b) is arranged in a tubular structure, one end of the second air pipe (2b) is provided with a second air hole (5b), the end of the second air pipe (2b) away from the second air hole (5b) is connected with the first air pipe (2a) of the first breather (6), the second sieve plate (1b) is arranged on one end of the second air pipe (2b) corresponding to the second air hole (5b), and the second sieve plate (1b) is coaxially arranged with the second air pipe (2b).

6. The wind turbine blade internal cavity air pressure equalization device of claim 5, wherein, The two ends of the second screen plate (1b) are connected with the second air pipe (2b) through the second baffle (15), and the second baffle (15) is arranged as a closed plate structure.

7. The wind turbine blade internal cavity air pressure equalization device of claim 5, wherein, The second air pipe (2b) is provided with a second connecting thread (4) at the end away from the second air hole (5b), and the second breather (11) is connected with the first breather (6) through the second connecting thread (4).

8. The wind turbine blade internal cavity air pressure equalization device of claim 1, wherein, A connecting structure is arranged at the connecting part of the first breather (6) and the back cover plate (7) or manhole cover, and the connecting structure is arranged on the side of the back cover plate (7) or manhole cover facing the second breather (11).

9. The wind turbine blade internal cavity air pressure equalization device of claim 1, wherein, A waterproof structure is further arranged at the connecting part of the first breather (6) and the back cover plate (7) or manhole cover, and the waterproof structure is arranged as a sealing assembly.

10. The wind turbine blade internal cavity air pressure equalization device of claim 1, wherein, The length of the first breather (6) is greater than the length of the second breather (11).

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