Fan blade and wind driven generator comprising same

Abstract

The utility model provides a fan blade and a wind driven generator comprising the same. The fan blade comprises a main blade close to the main machine and a tail blade away from the main machine, the main blade and the tail blade are detachably connected, the safety coefficient of the joint of the main blade and the tail blade is a, the safety coefficient of the part, close to the tail blade, of the main blade is b, and a is smaller than b. The main blade and the tail blade are detachably connected, and the safety coefficient of the joint of the main blade and the tail blade is smaller than that of the part, close to the tail blade, of the main blade, so that the fan blade can be disconnected at the joint of the main blade and the tail blade when hitting a fan tower drum in the running process; and the safety coefficient of the part, close to the tail blade, of the main blade is large, so that the main blade is not damaged in the collision process. In the subsequent repairing process, only the tail blade needs to be replaced, the material cost and the mechanical cost for repairing are reduced, the construction period is shortened, and the normal power generation loss caused by blade maintenance is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field, especially a fan blade and contain its wind driven generator. BACKGROUND

[0002] Wind power generation as a new type of energy, is more and more widely used.In recent years, with the development of wind power technology, the power of unit is more and more big, corresponding blade is more and more long, the required tower height is more and more high, the diameter of tower is more and more big.Due to the imperfection of fan control system, when the blade is deformed by wind, the blade control reaction delay, overreaction etc., blade sweep tower situation often occurs.As a kind of thin-walled structure, the diameter of steel tower is generally 4m~5m, wall thickness is 15mm~40mm, when sweep tower occurs, tower collapse accident is prone to occur.Even if the blade rotation speed is low, when sweep tower occurs, tower collapse accident does not occur, also will break the blade, needs to replace the blade as a whole.In the replacement of the blade, in addition to the cost of the blade itself, 1000t level main hoist is needed to enter the field, the cost is extremely high, therefore the loss is very big. SUMMARY

[0003] The utility model wants to solve the technical problem to overcome the defect that the loss is very big when fan blade sweeps tower in prior art, provide a fan blade and contain its wind driven generator.

[0004] The utility model solves the above technical problem by the following technical scheme:

[0005] A fan blade, the fan blade includes main blade and tail blade, the main blade and the tail blade are detachably connected, and the tail blade is located at the tail of the fan blade, the safety factor of the connecting place of the main blade and the tail blade is a, the safety factor of the part of the main blade close to the tail blade is b, a < b.

[0006] In the technical solution, the main blade and the tail blade are detachably connected, and the safety factor of the connection between the main blade and the tail blade is smaller than the safety factor of the part of the main blade close to the tail blade, so that when the fan blade hits the fan tower drum during operation, the fan blade can be disconnected at the connection between the main blade and the tail blade, and since the safety factor of the part of the main blade close to the tail blade is large, that is, the part of the main blade close to the tail blade is reinforced, the main blade is not damaged during the impact. In the subsequent repair process, only the tail blade needs to be replaced, reducing the material cost of repair. At the same time, the length of the tail blade is relatively small, and the tail blade is relatively low from the ground, so a main crane with a large tonnage is not required for maintenance, and only a car crane with a small tonnage is required, further reducing the mechanical cost of repairing the fan blade, greatly reducing the repair period, and reducing the normal power generation loss caused by blade repair.

[0007] Preferably, a is in the range of a>1.

[0008] Preferably, a is in the range of a≤1.03.

[0009] In the technical solution, by setting the safety factor a of the connection between the main blade and the tail blade to be between 1 and 1.03, the connection strength of the main blade and the tail blade is ensured to meet the normal operation requirements of the fan blade, while the connection between the main blade and the tail blade is disconnected as soon as possible when the tail blade hits the tower drum, thereby reducing the impact energy of the fan blade on the tower drum, and further reducing the risk of tower collapse.

[0010] Preferably, b is in the range of b≥1.1.

[0011] In the technical solution, by setting the safety factor of the part of the main blade close to the tail blade to be greater than or equal to 1.1, the structural strength of the part of the main blade close to the tail blade is large enough to further ensure that the main blade is not damaged by the impact when the tail blade of the fan blade hits the tower drum.

[0012] Preferably, the part of the main blade close to the tail blade extends from the tail of the main blade to the head of the main blade by a length L, and L≥1m.

[0013] Preferably, the part of the main blade close to the tail blade extends from the tail of the main blade to the head of the main blade by a length L, and L≤5m.

[0014] In the technical solution, the length of the part of the main blade close to the tail blade is greater than or equal to one meter, so that the size of the part of the main blade that is reinforced is not too small, and the part of the main blade close to the tail blade is not damaged when the tail blade hits the tower. The length of the part of the main blade close to the tail blade is less than or equal to five meters, so that the size of the part of the main blade that is reinforced is not too large, and the weight and other parameters of the fan blade are not greatly affected.

[0015] Preferably, the fan blade further comprises a first flange, a second flange and a bolt at the connection between the main blade and the tail blade, the first flange is arranged on the main blade, the second flange is arranged on the tail blade, the first flange is provided with a first through hole, the second flange is provided with a second through hole, the first through hole and the second through hole are arranged correspondingly, and the bolt is arranged in the first through hole and the second through hole to connect the first flange and the second flange.

[0016] In the technical solution, a connection mode of the main blade and the tail blade is provided, the main blade and the tail blade are connected by using the flange and the bolt, so that the safety factor of the main blade and the tail blade can be adjusted by changing the specifications and the number of the bolts, and the controllability of the safety factor of the connection between the main blade and the tail blade is improved.

[0017] Preferably, the main blade has a first cavity inside, the first flange is arranged in the first cavity, and the first flange is connected with the main blade by a screw;

[0018] And / or, the tail blade has a second cavity inside, the second flange is arranged in the second cavity, and the second flange is connected with the tail blade by a screw.

[0019] In the technical solution, the first flange and the second flange are arranged in the first cavity and the second cavity respectively, the screw can connect the first flange and the second flange with the fan blade from the direction of the outer surface of the fan blade, and the screw does not penetrate to the outer surface of the fan blade, so that the shape of the outer surface of the fan blade for wind is not affected by the first flange and the second flange, and the outer surface of the fan blade remains streamlined for wind.

[0020] Preferably, the outer circumferential side of the first flange at least partially abuts against the side wall of the first cavity;

[0021] And / or, the outer circumferential side of the second flange at least partially abuts against the side wall of the second cavity.

[0022] In the technical solution, the outer periphery of the first flange and the outer periphery of the second flange are arranged to at least partially abut the side walls of the first cavity and the second cavity respectively, so that the force borne by the fan blade can be directly transmitted to the first flange and the second flange, and the connection of the first flange and the second flange with the fan blade is more reliable.

[0023] Preferably, the number of the first through holes and the second through holes is multiple, and the multiple first through holes and the multiple second through holes are arranged in one-to-one correspondence.

[0024] Preferably, the first through holes are uniformly arranged along the circumference of the first flange, and the second through holes are uniformly arranged along the circumference of the second flange.

[0025] Preferably, the number of the first through holes, the second through holes and the bolts is c, and 10≤c≤30, and each bolt is arranged in a group of first through holes and second through holes in one-to-one correspondence.

[0026] Preferably, the part of the main blade close to the tail blade is coated with two more layers of glass fiber material or carbon fiber material than other parts of the main blade.

[0027] Preferably, after the main blade and the tail blade are connected, a layer of sealant is applied outside the joint, and the width of the sealant covers at least 5cm on both sides of the joint.

[0028] Preferably, the shape of the first flange is the same as the shape of the fan blade, and a circular arc transition is adopted close to the trailing edge of the fan blade; the shape of the second flange is the same as the shape of the fan blade, and a circular arc transition is adopted close to the trailing edge of the fan blade.

[0029] A wind turbine, the wind turbine comprising a tower;

[0030] The fan blade as described above.

[0031] The positive progress effect of the utility model lies in: by setting the main blade and the tail blade as detachable connection, and the safety factor of the connection between the main blade and the tail blade is less than the safety factor of the part of the main blade close to the tail blade, so that when the fan blade hits the fan tower in the running process, the fan blade can be disconnected at the connection between the main blade and the tail blade, and the main blade is not damaged in the impact process. In the subsequent repair process, only the tail blade needs to be replaced, which reduces the material cost of repair. At the same time, the length of the tail blade is small, and it is low from the ground, so a main crane with large tonnage is not needed for maintenance, only a car crane with small tonnage is needed, the mechanical cost of repairing the fan blade is further reduced, the construction period of repair is greatly reduced, and the normal power generation loss caused by blade repair is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the side view structure schematic drawing of main blade of one embodiment of the utility model.

[0033] Figure 2 It is the side view structure schematic drawing of tail blade of one embodiment of the utility model.

[0034] Figure 3 It is the cross section structure schematic drawing of the connecting place of main blade and tail blade of one embodiment of the utility model.

[0035] Figure 4 It is the structure schematic drawing of fan blade of one embodiment of the utility model.

[0036] Mark explanation:

[0037] Main blade 1

[0038] First cavity 101

[0039] Tail blade 2

[0040] Second cavity 201

[0041] First flange 3

[0042] First through hole 301

[0043] Second flange 4

[0044] Second through hole 401

[0045] Bolt 5 Specific implementation

[0046] The utility model will be explained more clearly and completely in combination with the attached drawing by taking a preferred embodiment.

[0047] As Figures 1-4As shown, the embodiment provides a wind turbine, which includes a tower (not shown in the figure) and a wind turbine blade. The wind turbine blade includes a main blade 1 close to the main machine and a tail blade 2 away from the main machine, the main blade 1 and the tail blade 2 are detachably connected, the safety factor of the connection between the main blade 1 and the tail blade 2 is a, and the safety factor of the part of the main blade 1 close to the tail blade 2 is b, a < b. By setting the main blade 1 and the tail blade 2 to be detachably connected, and the safety factor of the connection between the main blade 1 and the tail blade 2 is less than the safety factor of the part of the main blade 1 close to the tail blade 2, so that when the wind turbine blade hits the wind turbine tower during operation, the wind turbine blade can be disconnected at the connection between the main blade 1 and the tail blade 2, and because the safety factor of the part of the main blade 1 close to the tail blade 2 is larger, that is, the part of the main blade 1 close to the tail blade 2 is strengthened, the main blade 1 is not damaged during the impact process. In the subsequent repair process, only the tail blade 2 needs to be replaced, reducing the material cost of repair, at the same time, the length of the tail blade 2 is smaller, and it is lower from the ground, so it does not need a main crane with a large tonnage for maintenance, only a car crane with a smaller tonnage is needed, the mechanical cost of repairing the wind turbine blade will be further reduced, the repair period will be greatly reduced, and the normal power generation loss caused by the repair of the instrument will be reduced.

[0048] Specifically, in the wind turbine, the diameter of the tower is generally gradually reduced from bottom to top, and during the operation of the wind turbine blade, the tip of the wind turbine blade and the part close to the tip, that is, the tail blade 2 in the embodiment, is the part closest to the tower, that is, the part most likely to hit the tower. When the wind turbine blade hits the tower, generally speaking, as long as the part that is easy to hit the tower is broken, the blade will not appear secondary tower hitting. The specific situation of the wind turbine blade hitting the tower is known in the art, and will not be described here. Therefore, in the embodiment, if the wind turbine blade hits the tower, the first position affected by the impact is the tail blade 2, and when the impact is transmitted to the connection between the main blade 1 and the tail blade 2 in the direction of the main blade 1, the connection between the main blade 1 and the tail blade 2 will be disconnected, and after the connection between the main blade 1 and the tail blade 2 is disconnected, the main blade 1 will not have the risk of secondary tower hitting.

[0049] Wherein, the distance from the connection between the main blade 1 and the tail blade 2 to the tip, that is, the length of the tail blade 2, will be determined according to the size of the entire wind turbine blade and the diameter of the tower. Generally, the length of the tail blade 2 can be between 3m and 10m. The specific value of the length of the tail blade 2 can be confirmed by referring to the breaking condition of the wind turbine blade when the wind turbine blade hits the tower in the prior art, which will not be described here.

[0050] Specifically in the embodiment, as shown in the figure, Figure 4 The length L1 of the wind turbine blade is 90m, and the length L2 of the tail blade 2 is 5m.

[0051] Similarly, the length L of the part of the main blade 1 close to the tail blade 2, which is the length of the part of the main blade 1 extending from the tail of the main blade to the head of the main blade, can also be determined according to the specific size of the fan blade. Generally, the length L can be any value within the range of 1 m to 5 m (including 1 m and 5 m). By setting the length L of the part of the main blade 1 close to the tail blade 2 to be greater than or equal to 1 m, the size of the part of the main blade 1 that is reinforced is prevented from being too small, thereby ensuring that the part of the main blade 1 close to the tail blade 2 is not damaged by the impact when the tail blade 2 hits the tower. By setting the length L of the part of the main blade 1 close to the tail blade 2 to be less than or equal to 5 m, the size of the part of the main blade 1 that is reinforced is prevented from being too large, thereby preventing the weight and other parameters of the fan blade from being greatly affected.

[0052] In this embodiment, the length L of the part of the main blade 1 close to the tail blade 2 is 3 m.

[0053] The safety factor a of the connection between the main blade 1 and the tail blade 2 can be any value within the range of 1 to 1.03 (1 is not included, but 1.03 is included). The safety factor is the ratio of the maximum breaking load of the component to the design load. That is, the safety margin d of the connection between the main blade 1 and the tail blade 2 can be any value within the range of 0 to 0.03 (0 is not included, but 0.03 is included). The safety margin is the ratio of the part of the maximum breaking load of the component that exceeds the design load to the design load. By setting the safety factor a of the connection between the main blade 1 and the tail blade 2 to be within the range of 1 to 1.03, i.e., setting the safety margin d of the connection between the main blade 1 and the tail blade 2 to be within the range of 0 to 0.03, the connection strength between the main blade 1 and the tail blade 2 is ensured to meet the normal operation requirements of the fan blade, while the connection between the main blade 1 and the tail blade 2 is broken as soon as possible when the tail blade 2 hits the tower, thereby reducing the impact energy of the fan blade on the tower and further reducing the risk of the tower collapsing.

[0054] At the same time, the safety factor b of the part of the main blade 1 close to the tail blade 2 is not less than 1.1, i.e., the safety margin e of the part of the main blade 1 close to the tail blade 2 can be not less than 0.1. By setting the safety factor b of the part of the main blade 1 close to the tail blade 2 to be not less than 1.1, i.e., setting the safety margin e of the part of the main blade 1 close to the tail blade 2 to be not less than 0.1, the structural strength of the part of the main blade 1 close to the tail blade 2 is large enough to further ensure that the main blade 1 is not damaged by the impact when the tail blade 2 of the fan blade hits the tower.

[0055] Specifically in the embodiment, the safety factor a of the joint of the main blade 1 and the tail blade 2 is 1.02, and the safety factor b of the part of the main blade 1 close to the tail blade 2 is 1.12, that is, the safety margin d of the joint of the main blade 1 and the tail blade 2 is 0.02, and the safety margin e of the part of the main blade 1 close to the tail blade 2 is 0.12.

[0056] In the embodiment, as shown in the figure, Figure 3 The fan blade further comprises a first flange 3, a second flange 4 and a bolt 5, the first flange 3 is arranged on the main blade 1, the second flange 4 is arranged on the tail blade 2, the first flange 3 is provided with a first through hole 301, the second flange 4 is provided with a second through hole 401, the first through hole 301 and the second through hole 401 are correspondingly arranged, and the bolt 5 is arranged in the first through hole 301 and the second through hole 401 to connect the first flange 3 and the second flange 4. That is, in the embodiment, the main blade 1 and the tail blade 2 are connected by the first flange 3, the second flange 4 and the bolt 5. By using the flange and the bolt 5 to connect the main blade 1 and the tail blade 2, the safety factor of the main blade 1 and the tail blade 2 can be adjusted by changing the specifications and the number of the bolt 5, the controllability of the safety factor of the joint of the main blade 1 and the tail blade 2 is improved, and it is ensured that the joint of the main blade 1 and the tail blade 2 can be disconnected as soon as possible when the tail blade 2 hits the tower.

[0057] That is, the number of the first through hole 301 and the second through hole 401 can be adjusted according to the required safety factor, and the number of the first through hole 301 and the second through hole 401 can be multiple. When the number of the first through hole 301 and the second through hole 401 is multiple, the first through hole 301 and the second through hole 401 should be uniformly distributed along the circumferences of the first flange 3 and the second flange 4 respectively to disperse stress, which will not be described here.

[0058] Specifically in the embodiment, the thickness of the first flange 3 and the second flange 4 is 200mm, the width is 250mm, the number c of the first through hole 301 and the second through hole 401 is 23, the hole diameter is 39mm, and the specification of the bolt 5 is M36. That is, 23 M36 bolts 5 are used for connecting the main blade 1 and the tail blade 2 for each fan blade. It has been verified that the bearing capacity of the 23 bolts 5 can meet the requirements under various operating conditions, and the safety factor a is 1.02.

[0059] At the same time, the inside 3m range of the first flange 3 of the main blade 1 is appropriately strengthened, the fan blade in the embodiment is made of glass fiber material, so the strengthening method is to add two layers of glass fiber material on the inside of the main blade 1, that is, the part of the main blade close to the tail blade is provided with two more layers of glass fiber material than other parts of the main blade, so that the safety factor b is 1.12.

[0060] Of course, in other embodiments, the number and specifications of the bolts can also be set according to actual needs. Generally, the number of bolts c can be set between 10 and 30. When the part of the main blade close to the tail blade is strengthened, the same material as the fan blade should be used for strengthening, for example, when the fan blade is made of carbon fiber material, two more layers of carbon fiber material should be laid on the part of the main blade close to the tail blade than other parts of the main blade, so that the safety factor is 1.12. Here, it is not described again

[0061] In the embodiment, the first cavity 101 is arranged in the main blade 1, the first flange 3 is arranged in the first cavity 101, and the first flange 3 is connected with the main blade 1 by screws. At the same time, the second cavity 201 is arranged in the tail blade 2, the second flange 4 is arranged in the second cavity 201, and the second flange 4 is connected with the tail blade 2 by screws. Compared with the first flange 3 and the second flange 4 being sleeved on the outer surfaces of the main blade 1 and the tail blade 2 respectively, by arranging the first flange 3 and the second flange 4 in the first cavity 101 and the second cavity 201 respectively, the screws can be connected with the first flange 3 and the second flange 4 and the fan blade from the first cavity 101 and the second cavity 201 to the outer surface of the fan blade. The screws can not penetrate to the outer surface of the fan blade, so that the shape of the outer surface of the fan blade for windward is not affected by the first flange 3 and the second flange 4, and the outer surface of the fan blade remains the streamlined shape conducive to wind.

[0062] Further, as shown in Figure 1 and Figure 2 In the embodiment, a part of the outer periphery of the first flange 3 abuts against the side wall of the first cavity 101, and a part of the outer periphery of the second flange 4 abuts against the side wall of the second cavity 201. Specifically, in the embodiment, the shape of a part of the first flange 3 and a part of the second flange 4 matches the cross-sectional shape of a part of the fan blade, and specifically as shown in Figure 1 and Figure 2 The first flange 3 and the second flange 4 match the cross-sectional shape of the thicker part of the fan blade, and near the thinner part of the fan blade, the first flange 3 and the second flange 4 no longer match the cross-sectional shape of the fan blade, but are treated with a circular arc. By abutting the outer periphery of a part of the first flange 3 against the side wall of the first cavity 101 and abutting the outer periphery of a part of the second flange 4 against the side wall of the second cavity 201, the connection between the first flange 3 and the main blade 1 and the connection between the second flange 4 and the tail blade 2 are more convenient. At the same time, the force received by the fan blade can be directly transmitted to the first flange 3 and the second flange 4, so that the connection between the first flange 3 and the second flange 4 and the fan blade is more reliable.

[0063] Of course, in other embodiments, the shapes of the first flange 3 and the second flange 4 can also completely match the cross-sectional shape of the fan blade, so that the outer peripheral sides of the first flange 3 and the second flange 4 respectively abut against the side wall of the first cavity 101 and the side wall of the second cavity 201. Or in more embodiments, the first flange 3 and the second flange 4 can also be made into a circular ring, which will not be described here.

[0064] In the present embodiment, after the main blade 1 and the tail blade 2 are connected, a layer of sealant is applied outside the joint, and the width of the sealant covers at least 5 cm on both sides of the joint. Of course, appropriately widening the coverage width of the sealant can also improve the sealing effect.

[0065] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A wind turbine blade, c h a r a c t e r i s e d in that The fan blade comprises a main blade and a tail blade, the main blade and the tail blade are detachably connected, and the tail blade is located at the tail of the fan blade, the safety factor of the connection between the main blade and the tail blade is a, the safety factor of the part of the main blade close to the tail blade is b, and a < b.

2. The fan blade of claim 1, wherein The value range of a is a > 1; And / or, the value range of a is a ≤ 1.

03.

3. The fan blade of claim 1, wherein The value range of b is b ≥ 1.

1.

4. The fan blade of claim 1, wherein The extension length of the part of the main blade close to the tail blade from the tail of the main blade to the head of the main blade is L, and L ≥ 1 m; And / or, the extension length of the part of the main blade close to the tail blade from the tail of the main blade to the head of the main blade is L, and L ≤ 5 m.

5. The fan blade of claim 1, wherein The fan blade further comprises a first flange, a second flange and a bolt at the connection between the main blade and the tail blade, the first flange is arranged on the main blade, the second flange is arranged on the tail blade, the first flange is provided with a first through hole, the second flange is provided with a second through hole, the first through hole and the second through hole are correspondingly arranged, and the bolt is arranged in the first through hole and the second through hole to connect the first flange and the second flange.

6. The fan blade of claim 5, wherein The inside of the main blade has a first cavity, the first flange is arranged in the first cavity, and the first flange is connected with the main blade through a screw; The inside of the tail blade has a second cavity, the second flange is arranged in the second cavity, and the second flange is connected with the tail blade through a screw.

7. The fan blade of claim 6, wherein The outer circumferential side of the first flange at least partially abuts against the side wall of the first cavity; And / or, the outer circumferential side of the second flange at least partially abuts against the side wall of the second cavity.

8. The fan blade of claim 5, wherein The number of the first through hole and the second through hole is multiple, and the multiple first through holes and the multiple second through holes are one-to-one correspondingly arranged; and / or: The first through hole is uniformly arranged along the circumference of the first flange, and the second through hole is uniformly arranged along the circumference of the second flange.

9. The fan blade of claim 5, wherein The first through hole is uniformly arranged along the circumference of the first flange, and the second through hole is uniformly arranged along the circumference of the second flange, the number of the first through hole, the second through hole and the bolt is c, 10 ≤ c ≤ 30, and each bolt is arranged in a group of one-to-one corresponding first through holes and second through holes.

10. The fan blade of claim 5, wherein The part of the main blade close to the tail blade is coated with an increased film layer compared with other parts on the main blade, and the increased film layer at least comprises two layers of glass fiber material layers or carbon fiber material layers; And / or, after the main blade and the tail blade are connected, a layer of sealant is applied outside the joint, and the width of the sealant covers at least 5 cm on each side of the joint; And / or, the shape of the first flange is the same as the shape of the fan blade, and a circular arc transition is adopted close to the trailing edge of the fan blade; The shape of the second flange is the same as the shape of the fan blade, and a circular arc transition is adopted close to the trailing edge of the fan blade.

11. A wind driven electric power generator, characterised in that, The wind turbine comprises a tower; The fan blade according to any one of claims 1-10.

Images