WO2024114063A1 - Blade, impeller and wind power generation device - Google Patents

Abstract

A blade, an impeller and a wind power generation device. The blade comprises a blade root (1) and several connecting assemblies (2) arranged at intervals. The blade root comprises an outer laying layer (11) and an inner laying layer (12) which are formed on the blade root, wherein a mounting cavity is provided between the outer laying layer and the inner laying layer, the mounting cavity being annular; one end of each connecting assembly is inserted into the mounting cavity, and the other end thereof is adapted to be connected to a hub of a wind turbine. Each connecting assembly comprises a connecting rod (21), a connecting sleeve (22) and a limiting member (23), wherein the connecting rod is provided with a first portion (211) and a second portion (212), the first portion being mounted in the mounting cavity, the second portion protruding out of the mounting cavity and being adapted to be connected to the hub of the wind turbine, the connecting sleeve being sleeved on the second portion, and the limiting member being arranged between adjacent connecting rods and abutting against the adjacent connecting rods. The connecting rods in the blade are connected, at a position where the connecting rods are in connection with the blade root, to both the blade root and the limiting members, one part of loads transmitted from the blade root to the connecting rods are directly transmitted to the connecting rods, and the other part of loads are transmitted to the connecting rods by means of the limiting members, such that the problem of relatively low interface strength at the blade root is alleviated.

Description

Blade, impeller and wind power generation device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Chinese Patent Application No. 202211530876.8, filed on December 1, 2022, entitled “A Blade, an Impeller and a Wind Power Generation Device”, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to the technical field of wind power generation, and in particular to a blade and an impeller wind power generation device.

Background technique

Wind is one of the most pollution-free energy sources. It is inexhaustible. For coastal islands, grassland pastoral areas, mountainous areas and plateau areas that are short of water, fuel and have inconvenient transportation, it is very suitable to use wind power generation in accordance with local conditions. There is a lot of potential for this. Offshore wind power is an important area for the development of renewable energy, an important force to promote the advancement of wind power technology and industrial upgrading, and an important measure to promote the adjustment of energy structure.

As wind turbine power and wind turbine blade size increase, blade root load also increases, so the industry has put forward higher requirements on blade root connection strength. At present, the main blades in the industry include T-bolt connection, embedded bolt sleeve connection and adhesive bolt sleeve connection. All three methods require stud bolts to install the blades on the wind turbine.

However, wind turbine blades are mostly made of composite materials. The interface strength at the connection between the bolt sleeve and the blade root is low. The low interface strength will cause a sudden change in the bearing capacity of the connection, making it easy for stress concentration and fatigue to occur at the connection after the wind turbine runs for a long time. Ultimately, the service life of the impeller assembly will be greatly limited by the interface strength between the blade root and the bolt sleeve, which is not conducive to the high-power development of the fan.

Summary of the invention

Therefore, the technical problem to be solved by the present invention is that the connection between the blade root and the bolt sleeve in the prior art is prone to stress concentration and fatigue defects due to low interface strength.

To this end, the present invention provides a blade, comprising:

A blade root, comprising an outer layer and an inner layer formed on the blade root, wherein a mounting cavity is provided between the outer layer and the inner layer, and the mounting cavity is annular;

A plurality of connection components arranged at intervals, one end of each connection component is inserted into the installation cavity, and the other end is suitable for connecting to the fan, and each connection component includes a connection rod, a connection sleeve and a stopper;

The connecting rod has a first part and a second part, the first part is installed in the installation cavity, the second part protrudes out of the installation cavity and is suitable for connecting with the fan, and the connecting sleeve is arranged on the second part; the limiting member is arranged between adjacent connecting rods and abuts against adjacent connecting rods.

Optionally, in the above-mentioned blade, the connecting rod and the blade root are made of the same material.

Optionally, in the above-mentioned blade, the connecting rod and the blade root are made of fiber-reinforced composite material.

Optionally, in the above-mentioned blade, the connecting rod has a circular cross-section, and the limiting member has at least a portion close to the outer layer and a portion close to the inner layer, which are respectively in contact with adjacent connecting rods.

Optionally, in the above-mentioned blade, the limiting member is an I-shaped member, and two adjacent limiting members enclose a cylindrical cavity.

Optionally, the blade further comprises a connecting piece, wherein the connecting sleeve and the connecting rod are connected to each other. A clearance gap is formed, and the connecting member is arranged in the clearance gap, so that the connecting member drives the connecting sleeve and makes it have a movement tendency in the radial outward direction of the connecting sleeve.

Optionally, in the above blade, the clearance gap is arranged to be gradually reduced along the direction from the blade root to the blade tip; and/or

The connecting piece is arranged to be tapered along the direction from the blade root to the blade tip.

Optionally, in the above-mentioned blade, the cross-section of the first portion is gradually tapered along the blade root toward the blade tip.

Optionally, in the above blade, the connecting rod further has a third portion suitable for being arranged close to the blade tip, and the third portion is installed in the installation cavity, and the third portion is arranged on a side of the first portion away from the second portion;

In a direction from the blade root to the blade tip, the cross section of the third portion is gradually reduced, and the cross sections of the first portion are equal.

An impeller comprises a hub, a plurality of flanges, and the above-mentioned blades. The flanges are distributed on the hub along the circumferential direction of the hub, and a connecting sleeve is connected to the flanges.

A wind power generation device comprises a power generation unit and the above-mentioned impeller, wherein the power generation unit is electrically coupled to the hub, and the power generation device has a working state in which the impeller rotates under the drive of wind force and drives the power generation unit to generate electricity through the flange.

The technical solution provided by the present invention has the following advantages:

1. The blade provided by the present invention comprises a blade root and a plurality of spaced connection components. The blade root comprises an outer layer and an inner layer formed on the blade root, and a mounting cavity is provided between the outer layer and the inner layer. The mounting cavity is annular. One end of the connection component is inserted into the mounting cavity, and the other end is suitable for connecting to the fan. The connection component comprises a connecting rod, a connecting sleeve and a stopper. The connecting rod has a first part with a and a second part, wherein the first part is installed in the installation cavity, the second part protrudes out of the installation cavity and is suitable for connecting with the fan, the connecting sleeve is arranged on the second part, and the limiting member is arranged between adjacent connecting rods and abuts against the adjacent connecting rods.

The blade is formed by arranging an outer layer and an inner layer formed on the blade root, forming an annular installation cavity between the outer layer and the inner layer, and arranging a limit piece between adjacent connecting rods installed in the installation cavity, so that the connecting rod is firmly installed in the installation cavity. At the same time, a part of the load transmitted from the blade root to the connecting rod is directly transmitted to the connecting rod, and the other part is transmitted to the connecting rod through the limit piece. The connecting rod is connected to the blade root and the limit piece at the connection with the blade root, so that the limit piece bears the load along the axial direction of the blade root cross section among the loads transmitted from the blade root to the connecting rod, thereby reducing the interaction force between the blade root itself and the connecting rod, and further alleviating the problem of low interface strength at the blade root when the traditional connection method of directly embedding the bolt sleeve in the blade root and combining it with the bolt is adopted.

2. The blade provided by the present invention has the same connecting rod and blade root material. By making the connecting rod and blade root of the same material, under the premise of ensuring the strength of the blade root and the connecting rod, since the interface strength between the same materials is greater than the interface strength between different materials, the blade of this structure further improves the interface strength between the blade root and the connecting rod, improves the structural stability of the blade at the connection between the blade root and the connecting rod, and prolongs the service life.

3. The blade provided by the present invention also includes a connecting piece, and a clearance gap is formed between the connecting sleeve and the connecting rod. The connecting piece is arranged in the clearance gap so that the connecting piece drives the connecting sleeve and makes it have a tendency to move radially outward along the connecting sleeve. The blade of this structure is provided with a connecting piece in the clearance gap, so that after the connecting piece is inserted in the clearance gap, it applies pressure to the connecting rod and the connecting sleeve at the same time, thereby enhancing the reliability between the connecting rod and the connecting sleeve. At the same time, the connecting sleeve has a tendency to move outward after being subjected to the force applied by the connecting piece, and the sleeve body has an increased diameter. The sleeve body is installed on the external device. After being placed in the hole, it can fit more closely with the installation environment, improve the reliability of the connection between the connecting sleeve and the external device, and indirectly improve the stability of the blade after installation.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a cross-sectional view of a blade root provided in Embodiment 1 of the present invention;

FIG2 is an enlarged view of point A in FIG1 ;

FIG3 is a cross-sectional view of the connection assembly provided in Embodiment 1 of the present invention;

FIG4 is a structural cross-sectional view of another deformation mode of the connection assembly provided in Embodiment 1 of the present invention;

FIG5 is a side cross-sectional schematic diagram of FIG3 ;

FIG6 is a schematic side cross-sectional view of a protrusion 4;

FIG7 is a front view of a blade provided in Embodiment 1 of the present invention;

FIG8 is a top view of a blade provided in Embodiment 1 of the present invention;

Description of reference numerals:

1- blade root; 11- outer layer; 12- inner layer;

2-connecting assembly; 21-connecting rod; 211 first part; 212-second part; 213-third part; 22-connecting sleeve; 23-limiting member;

3-Connectors.

Detailed ways

The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a blade, as shown in Figures 1 to 8, including a blade root 1 and a plurality of spaced connection components 2. The blade root 1 includes an outer layer 11 formed on the blade root 1 and an inner layer 12 formed on the blade root 1. Layer 12, there is an installation cavity between the outer layer 11 and the inner layer 12, the installation cavity is annular, one end of the connecting component 2 is inserted in the installation cavity, and the other end is suitable for connecting with the fan, the connecting component 2 includes a connecting rod 21, a connecting sleeve and a limit member 23, the connecting rod 21 has a first part and a second part, the first part is installed in the installation cavity, the second part protrudes out of the installation cavity and is suitable for connecting with the fan, the connecting sleeve is arranged on the second part, and the limit member 23 is arranged between adjacent connecting rods 21 and abuts against adjacent connecting rods 21.

The blade is provided with an outer layer 11 and an inner layer 12 formed on the blade root 1, an annular installation cavity is formed between the outer layer 11 and the inner layer 12, and a limiter 23 is provided between adjacent connecting rods 21 installed in the installation cavity, so that the connecting rod 21 is firmly installed in the installation cavity. At the same time, the connecting rod 21 is simultaneously connected to the blade root 1 and the limiter 23 at the connection with the blade root 1. A part of the load transmitted from the blade root 1 to the connecting rod 21 is directly transmitted to the connecting rod 21, and the other part is transmitted to the connecting rod 21 through the limiter 23, so that the limiter 23 bears the load transmitted from the blade root 1 to the connecting rod 21, the load along the circumferential direction of the cross section of the blade root 1, thereby reducing the interaction force between the blade root 1 itself and the connecting rod 21, and further alleviating the problem of low interface strength at the blade root 1 when the traditional connection method of directly embedding the bolt sleeve in the blade root 1 and combining it with the bolt is adopted.

In the blade provided in this embodiment, the connecting rod 21 and the blade root 1 are made of the same material. By making the connecting rod 21 and the blade root 1 with the same material, while ensuring the strength of the blade root 1 and the connecting rod 21 themselves, because the interface strength between the same materials is greater than the interface strength between different materials, the blade of this structure further improves the interface strength between the blade root 1 and the connecting rod 21, improves the structural stability of the blade at the connection between the blade root 1 and the connecting rod 21, and extends the service life. Specifically, in this embodiment, the connecting rod 21 and the blade root 1 are fiber-reinforced composite materials. Fiber-reinforced composite materials are composed of reinforcing fiber materials, such as glass fiber, carbon fiber, aramid fiber, etc., and a matrix material. The composite material formed by winding, molding or pultrusion has the advantages of high specific strength, large specific modulus, good corrosion resistance and durability, etc. Preferably, the fiber-reinforced composite material is a resin-based glass fiber-reinforced composite material or a resin-based carbon fiber-reinforced composite material.

The blade provided in this embodiment, as shown in FIG. 1 and FIG. 2 , has a connecting rod 21 with a circular cross-section, and the limiting member 23 has at least a portion close to the outer layer 11 and a portion close to the inner layer 12, which respectively abut against the adjacent connecting rods 21. As an implementable embodiment of this embodiment, the limiting member 23 is an I-shaped member, and two adjacent limiting members 23 enclose a cylindrical cavity. There are semicircular concave cavities on both sides of the limiting member 23, and a cylindrical cavity is formed between the two limiting members 23 when the top and bottom ends of the adjacent limiting members 23 are close to each other. The connecting rod 21 is inserted into the cylindrical cavity and has a good fit with the side wall of the cavity. Of course, this embodiment is not the only limitation on the specific shape of the I-shaped member, as long as it has a top and a bottom, it can abut against the connecting rod 21 to achieve the effect of fixing the connecting rod 21.

The blade provided in this embodiment, as shown in Figures 3 to 6, also includes a connector 3, a clearance gap is formed between the connecting sleeve and the connecting rod 21, and the connector 3 is arranged in the clearance gap so that the connector 3 drives the connecting sleeve and has a tendency to move radially outward along the connecting sleeve. The blade of this structure is provided with the connector 3 in the clearance gap, so that after the connector 3 is inserted in the clearance gap, pressure is applied to the connecting rod 21 and the connecting sleeve at the same time, thereby enhancing the reliability between the connecting rod 21 and the connecting sleeve. At the same time, the connecting sleeve has a tendency to move outward after being subjected to the force applied by the connector 3, and the diameter of the sleeve body increases. After the sleeve body is installed in the hole of the external device, it can fit more closely with the installation environment, thereby improving the reliability of the connection between the connecting sleeve and the external device, and indirectly improving the stability of the blade after installation.

The blade provided in this embodiment, as shown in Figures 3 to 6, has a clearance gap that is gradually reduced along the blade root 1 toward the blade tip, and a connecting member 3 that is gradually reduced along the blade root 1 toward the blade tip. In the embodiment, the connecting member 3 is a wedge-shaped friction block, and the connecting member 3 is arranged to be gradually reduced along the blade root 1 toward the blade tip, which is convenient for installation in the clearance gap. After the wedge-shaped friction block is inserted into the clearance gap, it applies pressure toward the connecting rod 21 and the connecting sleeve at the same time, and the connection between the connecting rod 21 and the connecting sleeve is more reliable. In another practicable manner, the connecting member 3 is a filling glue, and after the filling glue is injected into the clearance gap, it can be fully filled into the clearance gap to achieve filling.

The blade provided in this embodiment, as shown in FIG3 or FIG4, has a first portion whose cross section is gradually reduced along the blade root 1 toward the blade tip. After the connecting rod 21 is inserted into the blade root 1, a sudden change in strength is easily generated at the end of the connecting rod 21, so that the first portion of the connecting rod 21 is gradually reduced along the blade root 1 toward the blade tip. The connecting rod 21 of this structure can form a strength reduction in a section of the blade root 1 where the connecting rod 21 is provided, thereby avoiding sudden changes in strength and improving the structural stability of the blade of this structure.

As another possible implementation of this embodiment, as shown in FIG. 3 or FIG. 4, the connecting rod 21 also has a third part suitable for being arranged near the blade tip side, and the third part is installed in the installation cavity, and the third part is arranged on the side away from the second part relative to the first part. In the direction along the blade root 1 toward the blade tip, the cross section of the third part is tapered, and the cross section of the first part is equal. Compared with the previous possible implementation, in this scheme, only a part of the end of the connecting rod 21 is tapered. While the blade of this structure ensures the strength of the blade root 1 in the second part, the strength of the blade root 1 without the connecting rod 21 section is reduced at the end of the third part, which avoids the sudden change of strength locally, and further improves the structural stability of the blade of this structure on the basis of the previous embodiment. In this embodiment, the first part, the second part, and the third part together form the whole connecting rod 21, and the length of the three parts is not limited in this embodiment.

Example 2

This embodiment provides an impeller, comprising a hub, three flanges, and three blades provided in Embodiment 1, wherein the flanges are arranged on the hub in a distributed manner along the circumferential direction of the hub, and the connecting sleeve is connected to the flanges. In this embodiment, the three flanges are arranged at three equal parts in the circumferential direction of the hub, and the three blades are arranged at an angle of 120° to each other.

Example 3

This embodiment provides a wind power generation device, including a power generation unit and the above-mentioned impeller. The power generation unit is electrically coupled to the hub. The power generation device has a working state in which the impeller rotates under the drive of wind force and drives the power generation unit to generate electricity through the flange.

Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims (11)

1. A blade, comprising:

   A blade root (1) comprising an outer layer (11) and an inner layer (12) formed on the blade root (1), wherein a mounting cavity is provided between the outer layer (11) and the inner layer (12), and the mounting cavity is annular;

   A plurality of connection components (2) arranged at intervals, one end of the connection component (2) being inserted into the installation cavity and the other end being suitable for connection with the fan, the connection component (2) comprising a connection rod (21), a connection sleeve and a stopper (23);

   The connecting rod (21) comprises a first part and a second part, the first part is installed in the installation cavity, the second part protrudes out of the installation cavity and is suitable for connecting to the fan, and the connecting sleeve is sleeved on the second part; the limiting member (23) is arranged between adjacent connecting rods (21) and abuts against adjacent connecting rods (21).
2. The blade according to claim 1, wherein the connecting rod (21) is made of the same material as the blade root (1).
3. The blade according to claim 2, wherein the connecting rod (21) and the blade root (1) are made of fiber-reinforced composite materials.
4. The blade according to claim 1, wherein the cross-section of the connecting rod (21) is circular, and the limiting member (23) has at least a portion close to the outer layer (11) and a portion close to the inner layer (12), which are respectively abutted against adjacent connecting rods (21).
5. The blade according to claim 4, wherein the limiting member (23) is an I-shaped member, and two adjacent limiting members (23) enclose a cylindrical cavity.
6. The blade according to claim 1, further comprising a connecting member (3), wherein the connecting sleeve A clearance gap is formed between the connecting rod (21), and the connecting member (3) is arranged in the clearance gap so that the connecting member (3) drives the connecting sleeve and makes it have a tendency to move in a radial outward direction of the connecting sleeve.
7. The blade according to claim 6, wherein the clearance gap is arranged to be gradually reduced along the blade root (1) toward the blade tip; and/or

   The connecting piece (3) is arranged to be tapered along the blade root (1) towards the blade tip.
8. The blade according to claim 1, wherein the cross-section of the first portion is arranged to be tapered along the blade root (1) toward the blade tip.
9. The blade according to claim 1, wherein the connecting rod (21) further has a third portion adapted to be arranged close to the blade tip, and the third portion is installed in the installation cavity, and the third portion is arranged on a side of the first portion away from the second portion;

   In a direction from the blade root (1) toward the blade tip, the cross section of the third portion is gradually reduced, and the cross sections of the first portion are equal.
10. An impeller comprises a hub, a plurality of flanges, and a plurality of blades as claimed in claims 1 to 9, wherein the flanges are distributed on the hub along the circumferential direction of the hub, and a connecting sleeve is connected to the flanges.
11. A wind power generation device comprises a power generation unit and the impeller as claimed in claim 10, wherein the power generation unit is electrically coupled to a hub, and the power generation device has a working state in which the impeller rotates under the drive of wind force and drives the power generation unit to generate electricity through the flange.