CN216950703U

CN216950703U - Wind power blade core material foam structure replacing balsawood

Info

Publication number: CN216950703U
Application number: CN202220052771.5U
Authority: CN
Inventors: 陈志强; 夏天; 常峻峰
Original assignee: Useon Nanjing Extrusion Machinery Co ltd
Current assignee: Jiangsu Yuesheng Technology Co ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-07-12
Anticipated expiration: 2032-01-10

Abstract

The utility model discloses a wind power blade core material foam structure replacing balsawood, belonging to the field of wind power blades, wherein the foam structure comprises an A/B/… … A/B laminated structure which is alternately arranged, the A layer structure is a PET foam layer, and the B layer structure is a reinforcing fiber layer or a prepreg tape; the PET foam layer serves as an A layer structure, the reinforcing fiber layer or the prepreg tape serves as a B layer structure, the A layer structure and the B layer structure are alternately stacked and molded, the manufactured foam structure has light weight, excellent shearing performance and relatively low cost, and the novel core material structure replacing the traditional wind power blade core material-balsawood can be developed.

Description

Wind power blade core material foam structure replacing balsawood

Technical Field

The utility model relates to the field of wind power blades, in particular to a wind power blade core material foam structure replacing balsa wood.

Background

At present, most wind power blades are made of composite materials, glass fibers or carbon fibers are used as reinforcing materials, and resin is used as a matrix. In order to reduce the weight of the blade and increase the mechanical properties of the blade, core materials are usually used at the front end, the rear end, the shear ribs and other parts of the blade, and the core materials generally comprise two parts, namely a shear web and a structural foam core material, and are one of the key materials of the wind power blade.

The main type of the traditional foam core material is balsawood, nearly 95% of balsawood in the world is sourced from tropical rainforests in south America, the growth speed is extremely high, and the balsawood can grow rapidly within 10-15 years after the soil is broken. However, the production period of the trees limits supply, and as the demand of wind power is exploded in recent years, the light wood has the situation of short supply.

Due to the instability of the balsa supply, blade manufacturers look to artificial materials. For example, a honeycomb core made of aluminum alloy or fiber has been widely used in the aerospace field, but the wind power blade has a large volume, the cost of the honeycomb core is high, and the honeycomb core is not suitable for large-area popularization. Based on this, those skilled in the art are actively engaged in research and development of a core foam structure that can replace balsa wood and can be popularized is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a wind-powered electricity generation blade core foam structure who replaces balsa wood has the novel core structure that matter is light, shearing property is excellent and with low costs be applicable to the popularization.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a wind power blade core material foam structure replacing balsawood comprises an A/B/… … A/B laminated structure which is alternately arranged, wherein the A layer structure is a PET foam layer, and the B layer structure is a reinforcing fiber layer or a prepreg tape.

Through adopting above-mentioned technical scheme, act as A layer structure by the PET foam layer, reinforcing fiber layer or preimpregnation area act as B layer structure, the foam structure of this application adopts above-mentioned A layer structure, B layer structure to fold the molding in turn, and the foam structure who makes has a matter light, good shear behavior, and the cost is lower relatively, can realize developing the novel core structure who replaces traditional wind-powered electricity generation blade core-balsa wood.

Optionally, the reinforcing fiber layer is made of carbon fiber cloth or glass fiber cloth.

By adopting the technical scheme, the carbon fiber cloth and the glass fiber cloth can both play a good reinforcing effect, and compared with the glass fiber cloth, the carbon fiber cloth has the advantages of high axial strength and modulus, low density, small thermal expansion coefficient and better anisotropy.

Optionally, the thickness of the layer A structure is 10-65 mm.

By adopting the technical scheme, the thickness of the layer A structure is limited to 10-65 mm, and the plate with the thickness range is convenient to produce and process; if the thickness of the A layer structure exceeds 65mm, the pressure on the melt at the die is uneven, and the product quality is not stable enough.

Optionally, the thickness of the layer B structure is 0.1-10 mm.

By adopting the technical scheme, the thickness of the layer B structure is limited to be 0.1-10 mm, when the layer B structure adopts a prepreg tape, the thickness of the prepreg tape is thinner, and most of the thickness of the layer B structure is 0.1-2 mm; when the B layer structure selects the reinforced fiber layer, the thickness of the B layer structure is mostly 2-10 mm, so that the B layer structure is ensured to have excellent mechanical strength.

Optionally, the a/B/… … a/B laminated structure is formed by multilayer co-extrusion.

Through adopting above-mentioned technical scheme, because the thickness of A layer structure and B layer structure all is the millimeter level, adopt multilayer crowded fashioned mode altogether, help improving the stability that combines between A layer structure, the B layer structure.

Optionally, the layer a structure and the layer B structure in the a/B/… … a/B laminated structure are molded by hot melting or glue.

Through adopting above-mentioned technical scheme, with A layer structure, B layer structure extrusion moulding back, again with fashioned A layer structure, B layer structure through hot melt or veneer connection for A layer structure and B layer structure's combination is more nimble, according to the on-the-spot processing condition, selects suitable forming mode to realize being connected of A layer structure and B layer structure.

Optionally, when the density of PET in the layer A structure is 100, the shear strength of the foam structure is 1.3-1.5 MPa, and the shear modulus is 80-85 MPa.

By adopting the technical scheme, compared with a 100-density PET foaming body, the shearing performance of the foam structure is obviously improved, the shearing strength can reach 1.3-1.5 MPa, and the shearing modulus can reach 80-85 MPa, so that the shearing performance is obviously superior to that of a common 100-density PET foaming body.

Optionally, when the density of PET in the layer A structure is 150, the shear strength of the foam structure is 1.8-2.3 MPa, and the shear modulus is 180-200 MPa.

By adopting the technical scheme, compared with a 150-density PET foaming body, the shearing performance of the foam structure is obviously improved, the shearing strength can reach 1.8-2.3 MPa, and the shearing modulus can reach 180-200 MPa, so that the shearing performance is obviously superior to that of a common 150-density PET foaming body.

In summary, the present application has the following technical effects:

1. the application develops a wind power blade core material foam structure, which comprises an A/B/… … A/B laminated structure, wherein a layer A structure is served by a PET foam layer, a layer B structure is served by a reinforced fiber layer or a prepreg tape, the prepared foam structure has light weight and excellent shearing performance, the cost is relatively low, and a novel core material structure for replacing the traditional wind power blade core material-balsawood can be developed;

2. the core material foam structure can be formed by multilayer co-extrusion, hot melting and gluing, and the processing and forming mode is flexible and convenient;

3. according to the foam structure, when the density of PET in the layer A structure is 100, the shear strength of the foam structure can reach 1.3-1.5 MPa, and the shear modulus of the foam structure can reach 80-85 MPa;

4. according to the foam structure, when the PET in the layer A structure is 150-density, the shear strength of the foam structure can reach 1.8-2.3 MPa, and the shear modulus of the foam structure reaches 180-200 MPa.

Drawings

FIG. 1 is a schematic structural view of a core foam structure according to the present application.

Fig. 2 is an enlarged view at a in fig. 1.

Description of the reference numerals:

1. a layer structure A; 2. and B layer structure.

Detailed Description

The present application is described in further detail below with reference to figures 1 and 2.

The embodiment of the application discloses wind-powered electricity generation blade core material foam structure who replaces the balsa wood, and wind-powered electricity generation blade core material among the prior art uses more to be the balsa wood, and the balsa wood needs growth cycle, and along with the outbreak of wind-powered electricity generation blade demand, the balsa wood can't satisfy the supply, and based on this, this application is researched and developed, strives to develop one kind and can replace the balsa wood, has excellent shear properties and lower manufacturing cost's core material foam structure.

Referring to fig. 1 and 2, the core material foam structure comprises an a/B/… … a/B laminated structure which is alternately arranged, the height of the core material can reach 1.2-2.4 m, the layer a structure 1 is a PET foam layer, the PET foam layer is formed by extruding and foaming PET resin, the thickness of the PET foam layer is 10-65 mm, and the preferred thickness is 15-30 mm; the B layer structure 2 is a reinforced fiber layer or a prepreg tape, the thickness is 0.1-10 mm, when the prepreg tape is selected, the prepreg tape is mostly purchased from other places, the specification on the market is generally 0.1-2 mm, and when the B layer structure 2 is the prepreg tape, the whole thickness of the prepared core material foam structure is thinner; when selecting the reinforcing fiber layer, compare with the preimpregnation area, the thickness on reinforcing fiber layer is great, mostly 2~10mm, preferably 2~5 mm.

Referring to fig. 1 and 2, the reinforcing fiber layer is made of carbon fiber cloth or glass fiber cloth, the carbon fiber cloth or the glass fiber cloth can be obtained by outsourcing, the carbon fiber cloth or the glass fiber cloth can play a good reinforcing role, and compared with the glass fiber cloth, the carbon fiber cloth has the advantages of high axial strength and modulus, low density, small thermal expansion coefficient and excellent anisotropy.

Referring to fig. 1 and fig. 2, the processing method of the a/B/… … a/B laminated structure is not limited, and a suitable processing method can be flexibly selected through multi-layer co-extrusion, hot melting or glue synthesis molding according to actual processing conditions, and any two or three combined methods can also be adopted. Because the height of wind-powered electricity generation blade core is between 1.2~2.4 meters, and the thickness of A layer structure 1 is 10~65mm, the thickness of B layer structure 2 is 0.1~10mm, it forms to need a plurality of A/B subelement to pile up, for example can make a plurality of A/B subelement through multilayer coextrusion, then through hot melt or veneer mode with a plurality of A/B subelement adhesive molding, the combination of different processing methods, still can prepare and have firmer foam structure.

The foam structure prepared by the method has outstanding shearing performance, for example, when the density of PET in the layer A structure 1 is 100, the density of the foam structure is 150-160 kg/m³The shear strength is 1.3-1.5 MPa, and the shear modulus is 80-85 MPa; the shear strength of the pure 100-density PET foam is 0.75-0.9 MPa, and the shear modulus is 18-25 MPa; when the density of the PET in the layer A structure 1 is 150, the density of the foam structure is 200-210 kg/m³The shear strength is 1.8-2.3 MPa, and the shear modulus is 180-200 MPa; the shear strength of the pure 150-density PET foam is 1.3-1.5 MPa, and the shear modulus is 25-35 MPa.

Claims

1. The utility model provides a replace light wood wind-powered electricity generation blade core foam structure which characterized in that: the foam structure comprises a layer A structure and a layer B structure which are alternately arranged, the layer A structure (1) is a PET foam layer, and the layer B structure (2) is a reinforced fiber layer or a prepreg tape; the layer A structure (1) and the layer B structure (2) are formed by multilayer coextrusion; when the density of PET in the layer A structure (1) is 100, the shear strength of the foam structure is 1.3-1.5 MPa, and the shear modulus is 80-85 MPa; when the density of the PET in the layer A structure (1) is 150, the shear strength of the foam structure is 1.8-2.3 MPa, and the shear modulus is 180-200 MPa.

2. The balsa-substituted wind turbine blade core foam structure of claim 1, wherein: the reinforced fiber layer is made of carbon fiber cloth or glass fiber cloth.

3. The balsa replacement wind blade core foam structure according to claim 1 or 2, wherein: the thickness of the layer A structure (1) is 10-65 mm.

4. The balsa replacement wind turbine blade core foam structure according to claim 3, wherein: the thickness of the B layer structure (2) is 0.1-10 mm.