Aerogenerator blade apex lightning protection device

Technical Field

The utility model relates to a lightning protection device of a wind power generator, in particular relates to a lightning protection device of a wind generator blade tip.

Background Art

Wind power generator is generally arranged in the field on the highlands, fan blade is very easy to lightning strike. Currently, general lightning protection technology will be in focus on the how to rapidly when lightning strikes the lightning into the ground, as much as possible and to reduce the current of the device, maximum protection for equipment and personnel safety, the loss is reduced to the minimum. Mainly in the design the lightning by the blade, the blade internal mine-channel, a ground path of the whole machine. As the wind-power unit the increase of the capacity of a single machine, also increased the blade length, some blade diameter and long reach 150 remaining meters, plus fan increase the height of the tower, the blade is more far away from the ground. Although most manufacturers lightning by increasing the number of the blade, or in a whole of the vane is disposed on a plurality of lightning receptor is used for lightning protection, however, because the blade structure limits, there is a certain distance from the lightning receptor and the blade tip, in the actual use, blade affected by the lightning strike leaf point of serious damage, therefore, how to solve the problem of the blade lightning protection leaf point, in wind power generation industry is the urgent need to solve a technical problem. In some technical literature is also arisen in the design of some lightning protection, but there are still high cost, inconvenient installation and maintenance, individual design is not reasonable defect.

Content of the utility model

The utility model the technical problem to be solved is to provide a lightning protection device of a wind generator blade tip in order to overcome the deficiencies in the prior art.

The utility model to solve the technical problems, the invention adopts the technical scheme is:

Lightning protection device of a wind generator blade tip, including the installation of the structure on the fan blade, the fan blade is provided with a metal protective cover leaf point, the rear part of the metal protective sleeve is provided with a 1st through hole, which passes through the lightning is meets dodges the pole 1st through hole with the metal sleeve in the conductive connection, the leaf point the metal protective jacket and corresponding to the through hole is provided with a 2nd, 2nd metal protective sleeve is which passes through a through hole of the fastening leaf point is connected with the fastener, the fastener is a two bolts and the sleeve, the sleeve of the openings at both ends of the structure, 2nd leaf point sleeve is embedded in the through hole of the inner wall of the through hole and tightly connected, two bolts are arranged opposite to the disc and the structure, the screw portion of the bolt and is arranged inside the sleeve with the screw thread of the sleeve.

Preferably, the thickness of the metal protective sleeve A, 1 mm _AOMARKENCODEGTX0AO _ A ≥ 0.5 mm, the material of the metal sleeve is made of copper, aluminum, stainless steel.

Further, the metal on the leaf point on the contact surface of the protective sleeve, is provided with an annular groove, the cross section of the annular groove is V-shaped, the adhesive is filled in the trench, with the inner surface of the metal protective sleeve leaf point bonding the outer surface.

As preferred, along the annular groove and axially spaced leaf pointleaf point is along the radial direction, to the distance between the annular groove 15 - 25mm, the width of the annular groove 2 - 4mm, groove deeply 1 - 2mm.

The utility model is characterized in that the technical progress achieved by:

1. because the leaf point of the fan blade is provided with a metal protective jacket of the, metal of the protective jacket and lightning receptor conductive connection, the increase on the basis of the area of the mine leaf point, reducing the blade tip to accumulate charge and the thunderclouds charge effect, when the lightning strike leaf point, the lightning can be through the protective jacket and lightning current, electrical current is introduced into the release of the blade lightning current to the ground wire channel, and the damage of the leaf point, can make the leaf point withstand greater impact of the lightning current, at the same time, due to the larger instantaneous speed leaf point, after the protective sleeve to avoid the increase of the air direct friction leaf point, improves the service life of the leaf point, leaf point can play the role of certain enhanced; because the metal protective jacket and is provided with a corresponding leaf point of the 2nd through hole, which passes through a metal sleeve arranged in the through holes is connected with the fastening leaf point the fastener, the fastener is composed of two bolts and the sleeve, the protective jacket and leaf point firm installation, safety and reliability; the two end openings of the sleeve structure, the through hole of the sleeve and embedded in the leaf point firmly connected with the inner wall of the through hole, since the vane is a hollow membrane structure, the bolt is difficult to be directly fixed on the protective sleeve leaf point of the blade, such as the connection means of the in the prior art, since the concentrated stress, with the blade centrifugal force produced by the high-speed rotation, the blade structure will be damaged, which in turn may produce protective cover remove the security risks, such as, the utility model first portion of the bushing is fixed on the blade tip, and then the bolt is fixed in the casing, the structure is simple, which can effectively improve the effect of fixing the fastening of the bolt, when in high-speed rotation to prevent leaf point thrown out of the protective sleeve; two bolts are arranged opposite to the pan head structure and, the screw portion of the bolt and is arranged inside the sleeve with the screw thread of the sleeve, two bolts to the fixed, reasonable structure, the thickness of the vanes visible different specifications, to adjust the length of the fastening bolts, universal is good.

2. because the thickness of the metal protective sleeve A, 1 mm _AOMARKENCODEGTX0AO _ A ≥ 0.5 mm, the protective jacket forming is easy, convenient installation, compared with the prior art, good pastes attaching of the blade, the blade tip will not impact on the blade profile, and light weight, the blade load is small, the maximum extent of the reduction of the influence on the operation of the blade.

3. leaf point on the on the contact surface of the metal sleeve, is provided with an annular groove, the cross section of the annular groove is V-shaped, the adhesive is filled in the trench, with the inner surface of the metal protective sleeve leaf point bonded on the outer surface of the, reasonable structure, the protective jacket and leaf point increase the mutual adhesion, compact and firm connection of the two, because the blade effectively overcomes the strong centrifugal force produced by the high-speed rotation of the role of, safety performance is improved.

4. because the annular the groove and the axially spaced leaf pointleaf point is along the radial direction, to the distance between the annular groove 15 - 25mm, the slot width is 2 - 4mm, groove deeply 1 - 2mm, through repeated experiment, parameter reasonable design, effective operating requirements, firm adhesion of the protective jacket and leaf point, to avoid the assembly between the two causes of the blade vibration and the like, has a small influence on the operating condition of the blade.

Description of drawings

Figure 1 is schematic view of the overall structure of the utility model.

Figure 2 is the [...] - [...] to the cutaway view of Figure 1.

In the Figure the Figure mark is as follows:

1. metal protective cover; 2, bolt; 3, an annular groove; 4, leaf point; 5, fan blade; 6, the lightning meets dodges the pole; 7, sleeve.

Mode of execution

The following will combine the Figure and in the embodiment detailed further in the utility model is:

Embodiment 1: as shown in Figure 1-2, vane blade tip lightning protection device of a wind power generator, including the installation of the fan blade 5 a lightning receptor on, the fan blade 5 leaf point of 4 is sleeved on the metal protective cover 1, in the metal protective cover 1 is provided with a 1st the rear part of the through hole, which passes through the lightning is meets dodges the pole 1st through hole 6 and the metal protective cover 1 conductive connection, in the metal protective cover 1 and leaf point 4 are respectively provided with a corresponding arrangement of the 3 groups of 2nd through hole, metal protective cover 1 is arranged which passes through the 2nd through hole leaf point the fastener and 4 are tightly connected, by two bolts of the fastener 2 and the sleeve 7, wherein, the sleeve 7 of the openings at both ends of the structure, the sleeve 7 is embedded in leaf point 4 of the 2nd through hole and bonding the inner wall of the through hole, two bolts 2 are ten word pan head structure and arranged opposite to the, bolt 2 is arranged inside the casing of the screw part 7 and the sleeve 7 is matched with the screw thread. Metal protective cover 1 A to the thickness of 0.5 mm, the metal protective cover 1 is of the material of the copper. In leaf point 4 with metal protective cover 1 on the contact surface of the, is evenly distributed with an annular groove 3, an annular groove 3 of the V-shaped cross section, the groove is filled with adhesive, metal protective cover 1 and the inner surface of leaf point 4 is adhered on the outer surface of the. An annular groove 3 along the leaf point 4 and axially spaced along the leaf point 4 is provided in the radial direction, the annular groove 3 between the distance of 15 mm, an annular groove 3 is the width of 2 mm, groove deeply 1 mm.

Embodiment 2: metal protective cover as shown in Figure 1-2, 1 A to the thickness of 0.7 mm, metal protective cover 1 of the material made of aluminum. The annular groove 3 between the distance of 20 mm, an annular groove 3 of the width of 3 mm, groove deeply 1.5 mm. The embodiment of the remaining structure, such as 1 stated.

Embodiment 3: as shown in Figure 1-2, metal protective cover 1 for A thickness of 0.9 mm, metal protective cover 1 for selection of the material of the stainless steel. The annular grooves 3 for the spacing between the 25 mm, an annular groove 3 of the width of 4 mm, groove deeply 2 mm. The embodiment of the remaining structure, such as 1 stated.

The above embodiment should not be understood as to limit of the utility model, the protection of this utility model is to record of the claim, any according to the Patent specification the replacement of the equivalent technical means, are not separated from the scope of protection of this Patent.