CN213175920U

CN213175920U - Punching type bolt connecting structure for wind turbine blade

Info

Publication number: CN213175920U
Application number: CN202022264660.4U
Authority: CN
Inventors: 陆凡; 陈程; 管彩文; 俞志强; 李丹; 徐杰
Original assignee: Wuxi Wind Power Institute Co ltd
Current assignee: Wuxi Wind Power Institute Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-05-11
Anticipated expiration: 2030-10-12

Abstract

The utility model relates to a wind energy conversion system blade technical field discloses a type bolted connection structure that punches for wind energy conversion system blade, including blade root section, blade root section is the hollow cylinder shape, and a plurality of perpendicular holes have been seted up to blade root section bottom, and the screw has been seted up at the top of perpendicular hole to the lateral wall of blade root section, erects hole and screw intercommunication, the utility model relates to a novelty can place the nut in the screw of blade root section lateral wall earlier when in-service use, then uses the bolt to pass the become oar bearing of wind energy conversion system in proper order, erects hole and nut for the firm reliable installation of blade, in addition, the load of blade root section when wind energy conversion system is great, when the intensity of nut can not satisfy the requirement, the length of the mid portion of adjustable screw increases its bending resistance section coefficient, makes its static strength and fatigue strength can satisfy standard design requirement.

Description

Punching type bolt connecting structure for wind turbine blade

Technical Field

The utility model relates to a wind energy conversion system blade technical field, concretely relates to type of punching bolted connection structure for wind energy conversion system blade.

Background

With the exploitation and use of non-renewable energy sources such as coal, oil and natural gas, the total storage amount of the non-renewable energy sources gradually decreases. In order to deal with the energy crisis, renewable energy sources such as wind energy, water energy, ocean energy, solar energy, biomass energy and the like are gradually replacing non-renewable energy sources. Because of the wide regions, the regions are endangered by sea areas and the difference of the north and south altitudes is large in China, wind driven generators are installed in many places for wind power generation.

In the whole wind driven generator equipment, a wind turbine blade is the most core component of a wind turbine, and the good design, the excellent performance and the good connection of the wind turbine blade are key factors for ensuring the normal and stable operation of the whole unit. However, as the capacity of a single machine of the wind turbine is increased and the length of the blade is increased, the load at the position of the blade root is also gradually increased, the reliable connection of the blade root is also important, and the cost is greatly increased if only the pitch circle diameter of the bolt is increased to meet the requirement of the connection strength.

Patent document CN207363818U discloses a rear-perforated bolt connection structure for a large wind turbine blade, which increases the maximum load that the blade root can bear by opening two rows of through holes at the bottom of the blade root. However, the amount of bolts used is increased, so that the installation time and the installation workload required for installing the wind turbine blade with the structure are also increased, and inconvenience is brought to the actual operation.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of background art, the utility model provides a type bolted connection structure that punches for wind energy conversion system blade, the technical problem that solve is that prior art sets up two rows of slot holes and installs the bolt for the joint strength who increases wind energy conversion system blade bottom blade root section, has increased installation time and installation work load, brings inconvenience for actual operation.

For solving the technical problem, the utility model provides a following technical scheme: the utility model provides a type of punching bolted connection structure for wind turbine blade, includes blade root section, and blade root section is the hollow cylinder shape, and a plurality of perpendicular holes have been seted up to blade root section bottom, and the screw has been seted up at the top of perpendicular hole to the lateral wall of blade root section, erects hole and screw intercommunication.

Further, the vertical holes are evenly distributed at the bottom of the blade root section.

Wherein, the screw runs through the lateral wall of blade root section.

In addition, a nut is installed in the screw hole, a bolt is installed in the vertical hole, one end of the bolt is in threaded connection with the nut, and the other end of the bolt is connected with a variable pitch bearing of the wind turbine.

Furthermore, both ends of the cross section of the screw hole in the vertical direction are semicircular, and the middle of the cross section of the screw hole in the vertical direction is square.

Compared with the prior art, the utility model beneficial effect who has is: the utility model discloses a set up the screw at the top of erecting the hole, at the screw in mounting nut, mounting bolt and be connected the both ends of bolt with the change oar bearing of nut and wind turbine respectively in erecting the hole, blade root section can bear more loads, and then has reduced the installation time and the work load of offering quantity and wind turbine blade of the slot hole of blade root section bottom.

Drawings

The utility model discloses there is following figure:

FIG. 1 is a schematic structural view of a blade root section in an embodiment;

FIG. 2 is a schematic view of a bottom portion of a blade root section in an embodiment;

FIG. 3 is a schematic structural view of a blade root section provided with vertical holes and screw holes in an embodiment;

FIG. 4 is a schematic view of a blade root section of an embodiment being connected to a pitch bearing of a wind turbine by bolts;

fig. 5 is a schematic sectional view of a screw hole in the embodiment in the vertical direction.

In the figure: 1. the blade comprises a blade root section, 2 vertical holes, 3 screw holes, 4 variable pitch bearings of a wind turbine, 5 bolts.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1-4, a punching type bolt connection structure for a wind turbine blade comprises a blade root section 1, wherein the blade root section 1 is in a hollow cylinder shape, a plurality of vertical holes 2 are formed in the bottom of the blade root section 1, a screw hole 3 is formed in the top of each vertical hole 2 on the side wall of the blade root section 1, and the vertical holes 2 are communicated with the screw holes 3.

Alternatively, the vertical holes 2 are evenly distributed at the bottom of the blade root section 1.

Optionally, the screw hole 3 penetrates through the sidewall of the blade root section 1.

Optionally, a nut is installed in the screw hole 3, a bolt 5 is installed in the vertical hole 2, one end of the bolt 5 is in threaded connection with the nut, and the other end of the bolt 5 is connected with a variable pitch bearing 4 of the wind turbine.

As shown in fig. 5, both ends of the cross section of the screw hole 5 in the vertical direction are semicircular, and the middle of the cross section of the screw hole 5 in the vertical direction is square.

In a practical use process, a nut is placed in a screw hole 3 in the side wall of a blade root section 1, and then a bolt 5 sequentially penetrates through a variable-pitch bearing 4, a vertical hole 2 and the nut of a wind turbine, so that the blade is firmly and reliably mounted, and the optional nut can be an I-shaped nut. In addition, when the load of the blade root section 1 of the wind turbine is large and the strength of the I-shaped nut cannot meet the requirement, the length of the middle part of the screw hole 3 can be adjusted, and the bending-resistant section coefficient of the screw hole is increased, so that the static strength and the fatigue strength of the screw hole can meet the standard design requirement. Meanwhile, the strength of the laminated plate of the blade root section 1 cannot be influenced by axially improving the I-shaped nut, the connection strength of the blade root section 1 can be higher without changing the pitch circle size of the blade root section 1 and the size of a variable pitch bearing 4 of a wind turbine, the worse load working condition can be matched, the modification cost is reduced, and the like.

In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a type of punching bolted connection structure for wind turbine blade, includes blade root section, blade root section is the hollow circular cylinder shape, its characterized in that: the blade root section is provided with a plurality of vertical holes at the bottom, the side wall of the blade root section is provided with screw holes at the top of the vertical holes, and the vertical holes are communicated with the screw holes.

2. The perforated bolt connecting structure for a wind turbine blade according to claim 1, wherein: the vertical holes are uniformly distributed at the bottom of the blade root section of the blade.

3. The perforated bolt connecting structure for a wind turbine blade according to claim 1 or 2, wherein: the screw hole penetrates through the side wall of the blade root section of the blade.

4. The perforated bolt connecting structure for a wind turbine blade according to claim 3, wherein: the wind turbine pitch control device is characterized in that a nut is installed in the screw hole, a bolt is installed in the vertical hole, one end of the bolt is in threaded connection with the nut, and the other end of the bolt is connected with a pitch bearing of a wind turbine.

5. The perforated bolt connecting structure for a wind turbine blade according to claim 1, wherein: the screw hole is semicircular at two ends of the cross section in the vertical direction, and the middle of the cross section of the screw hole in the vertical direction is square.