Perfusion system for prefabricated wind power blade trailing edge UD

Abstract

The utility model belongs to the technical field of wind power blade forming, and particularly relates to a pouring system of a prefabricated wind power blade trailing edge UD. A flow guide net is laid from the bottom of a mold cavity to one side of the top of a trailing edge UD mold along the side face of the mold cavity on the chordwise side of the mold cavity; the other side of the diversion net in the chordwise direction of the mold cavity is located at the bottom of the mold cavity and forms a gap I with the side surface of the mold cavity; the glue injection ohmic pipe is arranged on the flow guide net; the glass fabric layer is laid in the mold cavity; the air exhaust bag is located above the glass fiber cloth layer, an interval II is formed between one side, close to the glue injection ohm pipe, of the air exhaust bag and the corresponding side face of the mold cavity, and on the projection in the plumb bob direction, the flow guide net and the interval I have an overlapped area; the vacuum bag film is arranged on the top of the trailing edge UD mold. According to the utility model, the infiltration flow of resin is more uniform in the whole filling process, the problem of wrapping flow is reduced, the defect of poor impregnation is avoided, and the filling effect stability of the trailing edge UD and the product forming quality are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind turbine blade molding, and in particular relates to a perfusion system for prefabricating a trailing edge UD of a wind turbine blade. Background Art

[0002] In recent years, my country's wind power industry has been in a period of rapid development, and the power generation of a single unit has been increasing rapidly. The length of the blades that match the main engine is getting longer and longer. As an important part of the entire wind turbine, the stability and reliability of the quality of the blade is crucial. The quality control requirements for large blades (over 90m) are higher and more difficult. The trailing edge UD is an important part of the wind turbine blade. As the trailing edge beam of the wind turbine blade, it provides a strong guarantee for the strength of the blade during operation. In the conventional process, the cloth layer of the trailing edge UD is laid on the shell together with the shell layer, and is formed together with the shell by vacuum infusion molding. The molding efficiency is relatively slow, and there are many molding and infusion defects in the trailing edge UD area, which may even cause the blade to be scrapped. For this reason, some infusion processes for prefabricated trailing edge UD have been proposed in the prior art.

[0003] The Chinese invention application with publication number CN113400674A provides a manufacturing process for single-mode double UD prefabrication of wind turbine blades, which uses a set of molds to simultaneously produce two sets of trailing edge prefabricated trailing edge UD products. In this invention application, the guide net is laid on top of the UD product, and the exhaust pipe is located on both sides of the mold. This method is prone to the defect of poor bottom infusion. In addition, most of the conventional trailing edge UD prefabrication infusion processes are similar to the glass fiber main beam prefabrication infusion process. The flow channel layout generally adopts the design method of upper and lower flow guides. Due to the trailing edge UD design requirements, the trailing edge UD needs to be laid in staggered layers. The flow channel design of the upper and lower guides makes it difficult to control the uniformity of the upper and lower guides during the infusion process, and is prone to flow problems caused by uneven upper and lower guides, resulting in poor impregnation defects. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a prefabricated wind turbine blade trailing edge UD infusion system which can improve trailing edge UD infusion stability and infusion quality.

[0005] The content of this utility model includes:

[0006] A trailing edge UD mold; the trailing edge UD mold has a mold cavity for molding the trailing edge UD;

[0007] A guide net; the guide net is laid in the mold cavity, and the guide net is laid from the bottom of the mold cavity along the side of the mold cavity to the top of the rear edge UD mold on one side of the mold cavity chord upward, and the guide net is located at the bottom of the mold cavity on the other side of the mold cavity chord upward and has a gap I between the side of the mold cavity;

[0008] A glue injection ohmic tube, the glue injection ohmic tube is located on one side of the top of the trailing edge UD mold and is arranged on the guide net;

[0009] A glass fiber cloth layer, which is laid in the mold cavity and arranged above the area where the guide net is located at the bottom of the mold cavity;

[0010] The vacuum bag is located above the glass fiber cloth layer and is laid from the blade root position to the blade tip position in the mold cavity in the expansion direction of the mold cavity. There is a gap II between the side of the vacuum bag close to the injection ohm tube and the corresponding side of the mold cavity in the chord direction of the mold cavity, and in the projection in the plumb bob direction, the guide net and the gap I have an overlapping area;

[0011] Vacuum bag film, set the trailing edge UD mold top.

[0012] Furthermore, the vacuum bag has a gap III between the side away from the injection ohmic tube and the corresponding side of the mold cavity on both sides in the chord direction of the mold cavity, and the size of the gap III is smaller than the size of the gap II.

[0013] Furthermore, the vacuum bag is connected to a plurality of vacuum tubes, and the plurality of vacuum tubes are arranged at intervals.

[0014] Furthermore, a perforated isolation membrane is provided between the guide net and the glass fiber cloth layer, and between the vacuum bag and the glass fiber cloth layer.

[0015] Furthermore, the perforated isolation membrane located between the guide net and the glass fiber cloth layer covers the bottom of the mold cavity and one side of the mold cavity where the guide net is located.

[0016] Furthermore, a release cloth is arranged between the perforated isolation membrane and the glass fiber cloth layer.

[0017] Furthermore, the side surface of the demoulding cloth is laid along the side surface of the mold cavity to the top of the rear edge UD mold.

[0018] Furthermore, it also includes a plurality of glue injection ports, wherein the glue injection ohmic tube is arranged on the guide net to extend along the span direction of the mold cavity, the plurality of glue injection ports are arranged at intervals along the span direction of the mold cavity, and the plurality of glue injection ports are all connected to the glue injection ohmic tube.

[0019] Furthermore, the guide net is fixed to the mold cavity through a fixing piece.

[0020] Furthermore, the vacuum bag film is a double-layer bag film structure.

[0021] The beneficial effect of the utility model is that one-side perfusion is adopted, and a lower guide net is used in combination with an upper vacuum bag to assist in vacuuming. A gap II is set between the vacuum bag and the side close to the injection ohm tube, so that the vacuum bag as a whole is closer to the side of the top of the rear edge UD mold away from the injection ohm tube, that is, the vacuum bag is arranged atFigure 1 It is set more to the right from the perspective. During the infusion, the resin flows from one side of the mold along the guide net into the mold cavity. Under the auxiliary air extraction of the vacuum bag and the position setting of the vacuum bag, the resin continues to flow toward the end of the guide net as the infusion is performed and gradually completely infiltrates the glass fiber cloth layer from the bottom to the top and toward the side of the mold cavity away from the injection ohm tube. At the same time, since a gap I is set between the end of the guide net and the side of the mold cavity, and there is an overlapping area in the projection of the vacuum bag and the plumb bob direction, space for the resin to be transversely infiltrated can be provided at the end of the guide net and the side of the mold cavity away from the injection ohm tube, ensuring that the resin can move upward to infiltrate the glass fiber cloth layer on the side of the mold cavity away from the injection ohm tube, and avoid the phenomenon of encapsulation caused by the resin moving upward too fast on the side of the mold cavity bottom. The infiltration flow of the resin during the overall infusion process is more uniform, reducing the problem of encapsulation flow, avoiding the defect of poor impregnation, and improving the stability of the infusion effect of the trailing edge UD and the product molding quality.

[0022] In the utility model, the trailing edge UD is prefabricated by a separate trailing edge UD mold, the cloth layer structure is relatively simple, and there is no influence of the cloth layer in the core material and other structures of the shell. The laying of the guide net on the upper surface of the glass fiber cloth layer is cancelled, which not only avoids the flow wrapping problem caused by uneven upper and lower guides, but also reduces the amount of resin absorbed by the guide net because the guide net does not need to be laid on the upper surface, thereby reducing the material cost, and also reduces the laying time of the guide net on the upper surface, thereby improving the molding efficiency of the trailing edge UD. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a pouring system for a prefabricated wind turbine blade trailing edge UD according to the utility model.

[0024] In the figure: 1. rear edge UD mold; 2. guide net; 201. spacer I; 3. glue-injected ohmic tube; 4. glass fiber cloth layer; 5. vacuum bag; 501. spacer II; 502. spacer III; 6. perforated isolation film; 7. demoulding cloth. DETAILED DESCRIPTION

[0025] like Figure 1As shown, the utility model includes a trailing edge UD mold 1, a guide net 2, a glue-injected ohmic tube 3, a glass fiber cloth layer 4, an air extraction bag 5 and a vacuum bag film. The trailing edge UD mold 1 has a mold cavity for molding the trailing edge UD. Since the trailing edge UD is a part of the wind turbine blade, its geometric direction is defined in the same way as the geometric direction of the wind turbine blade, that is, the span direction of the trailing edge UD is the same direction as the span direction of the wind turbine blade when the trailing edge UD is located on the wind turbine blade, and the chord direction of the trailing edge UD is the same direction as the chord direction of the wind turbine blade when the trailing edge UD is located on the wind turbine blade. In the utility model, since the mold cavity is used to mold the trailing edge UD, the geometric direction of the mold cavity is defined in the same way as the geometric direction of the trailing edge UD, the span direction of the mold cavity is the same direction as the span direction of the trailing edge UD when the trailing edge UD is located in the mold cavity, and the chord direction of the mold cavity is the same direction as the chord direction of the trailing edge UD when the trailing edge UD is located in the mold cavity. Figure 1 This is a schematic diagram of the longitudinal section of the utility model. Figure 1 The left and right direction in the figure is the chord direction of the mold cavity.

[0026] The guide net 2 is laid in the mold cavity, and the guide net 2 is on the side of the mold cavity chord upward (i.e. Figure 1 The left side of the guide net 2 from the perspective of the mold cavity is laid from the bottom of the mold cavity along the side of the mold cavity to the top side of the rear edge UD mold 1, and the guide net 2 is on the other side of the mold cavity chord upward (i.e. Figure 1 The right side of the guide mesh 2 from the perspective of the mold is located at the bottom of the mold cavity and has a gap I201 between it and the side of the mold cavity, wherein the other side of the guide mesh 2 is the injection end of the guide mesh 2, and the gap I201 is located between the end of the guide mesh 2 and the side of the mold cavity. The injection ohmic tube 3 is located on the top side of the trailing edge UD mold 1 and is arranged on the guide mesh 2. The injection ohmic tube 3 is used to drain the resin to distribute and diffuse it. The glass fiber cloth layer 4 is laid in the mold cavity and is arranged above the area where the guide mesh 2 is located at the bottom of the mold cavity, as shown in FIG. Figure 1 As shown, part of the guide net 2 is located at the bottom of the mold cavity, and the other part is located at the side of the mold cavity and the top side of the trailing edge UD mold 1. The position of the glass fiber cloth layer 4 in the mold cavity is specifically located above the guide net 2 at the bottom of the mold cavity, and the glass fiber cloth layer 4 is specifically laid in the mold cavity according to the shape of the trailing edge UD.

[0027] The vacuum bag 5 is located above the glass fiber cloth layer 4 and is laid from the blade root position to the blade tip position in the mold cavity expansion direction. The vacuum bag 5 has two sides in the mold cavity chord direction (i.e. Figure 1 In the left and right sides of the vacuum bag 5 under the viewing angle, there is a gap II501 between the side close to the injection ohm tube 3 and the corresponding side of the mold cavity, and in the projection in the plumb direction, the guide net 2 and the gap I201 have an overlapping area. Figure 1The vacuum bag 5 is specifically a VAP film material, which can block the resin and allow the gas to pass through. The vacuum bag film is set on the top of the rear edge UD mold 1 to cover the mold cavity, so that a relatively closed space is formed in the mold cavity.

[0028] The utility model adopts one-side perfusion, and adopts the method of lower guide net 2 and upper vacuum bag 5 to assist in vacuuming, and sets interval II501 between the vacuum bag 5 and the side of the injection ohm tube 3, so that the vacuum bag 5 is arranged closer to the top of the rear edge UD mold 1 and away from the side of the injection ohm tube 3, that is, the vacuum bag 5 is arranged at the side of the rear edge UD mold 1. Figure 1 It is set more to the right from the perspective. During the infusion, the resin flows into the mold cavity along the guide net 2 from one side of the mold. Under the auxiliary air extraction of the vacuum bag 5 and the position setting of the vacuum bag 5, the resin continues to flow toward the end of the guide net 2 as the infusion is performed, and gradually completely infiltrates the glass fiber cloth layer 4 from the bottom to the top and toward the side of the mold cavity away from the injection ohm tube 3. At the same time, since a gap Ⅰ201 is set between the end of the guide net 2 and the side of the mold cavity, and there is an overlapping area on the projection of the vacuum bag 5 and the plumb bob direction, a space for the resin to be transversely infiltrated can be provided at the end of the guide net 2 and the side of the mold cavity away from the injection ohm tube 3, ensuring that the resin can move upward to infiltrate the glass fiber cloth layer 4 on the side of the mold cavity away from the injection ohm tube 3, and avoiding the phenomenon of encapsulation caused by the resin moving upward too fast on the side of the mold cavity bottom. The infiltration flow of the resin during the overall infusion process is more uniform, reducing the problem of encapsulation flow, avoiding the defect of poor impregnation, and improving the stability of the infusion effect of the trailing edge UD and the product molding quality.

[0029] In the utility model, the trailing edge UD is preformed by a separate trailing edge UD mold 1, the cloth layer structure is relatively simple, and there is no influence of the cloth layer in the core material and other structures of the shell. The laying of the guide net 2 on the upper surface of the glass fiber cloth layer 4 is cancelled, which not only avoids the flow wrapping problem caused by uneven upper and lower guides, but also reduces the amount of resin absorbed by the guide net 2 because the guide net 2 does not need to be laid on the upper surface, thereby reducing the material cost, and also reduces the laying time of the upper surface guide net 2, thereby improving the molding efficiency of the trailing edge UD.

[0030] The vacuum bag 5 has a gap III502 between the side away from the glue injection ohmic tube 3 and the corresponding side of the cavity on both sides in the chord direction of the cavity, and the size of the gap III502 is smaller than the size of the gap II501. By setting the gap III502 smaller than the gap II501, the vacuum bag 5 is kept closer to the side of the top of the rear edge UD mold 1 away from the glue injection ohmic tube 3, so that the staff can observe the resin infiltration condition of the side of the cavity away from the glue injection ohmic tube 3.

[0031] In the present invention, the size of the interval II 501 is preferably 60±20 mm, the size of the guide net 2 laid to the top side of the rear edge UD mold 1 is preferably 100±30 mm. The width of the vacuum bag 5 (i.e., the size in the chord direction of the mold cavity) is preferably 350~400 mm, and the interval III 502 is preferably 30±10 mm.

[0032] The vacuum bag 5 is connected with several vacuum tubes, and the several vacuum tubes are arranged at intervals to ensure the uniformity of vacuuming of the vacuum bag 5. In the utility model, the trailing edge UD mold 1 is provided with several vacuum holes 1, and several vacuum tubes are connected to the several vacuum holes 1, and the several vacuum holes 1 are connected to the external vacuum mechanism, and the mold cavity is evacuated along the vacuum bag 5 through the several vacuum holes. Among them, in some embodiments of the utility model, according to the infusion requirements, several vacuum holes 2 can be arranged on the side of the trailing edge UD mold 1, and the several vacuum holes 2 are connected to the external vacuum mechanism to provide a certain vacuum power to the side of the mold cavity. The several vacuum holes 2 are preferably arranged on the side of the trailing edge UD mold 1 away from the injection ohmic tube 3. In this embodiment, the several vacuum holes 2 are provided with a vacuum kit made of VAP film material to ensure the passage of gas while blocking the resin. The arrangement of the several vacuum holes 2 and the vacuum kit is the prior art, and the specific setting method is not repeated.

[0033] A perforated isolation membrane 6 is arranged between the guide net 2 and the glass fiber cloth layer 4 and between the vacuum bag 5 and the glass fiber cloth layer 4. The perforated isolation membrane 6 located between the guide net 2 and the glass fiber cloth layer 4 covers the bottom of the mold cavity and one side of the mold cavity where the guide net 2 is located. Specifically, the size of the perforated isolation membrane 6 located between the guide net 2 and the glass fiber cloth layer 4 needs to cover the area where the guide net 2 is located; the size of the perforated isolation membrane 6 located between the vacuum bag 5 and the glass fiber cloth layer 4 needs to cover the vacuum bag 5, so as to facilitate the tearing off of the guide net 2 and the vacuum bag 5 after infusion and curing.

[0034] A release cloth 7 is arranged between the perforated isolation film 6 and the glass fiber cloth layer 4 to produce a rough surface for the subsequent process and also to play a certain role in surface protection. The side of the release cloth 7 is laid along the side of the mold cavity to the top of the rear edge UD mold 1 to ensure that the size of the release cloth 7 can cover the product surface.

[0035] The glue-injected ohmic tube 3 is arranged on the guide net 2 to extend along the span direction of the mold cavity. The span direction dimension of the glue-injected ohmic tube 3 is that its two ends are 200±30mm away from the two ends of the mold cavity in the span direction of the mold cavity, and are 50mm away from the two ends of the guide net 2. The glue-injected ohmic tube 3 is 50±10mm away from the side of the mold cavity in the chord direction of the mold cavity.

[0036] The utility model also includes a plurality of glue injection ports, which are arranged at intervals along the extension direction of the mold cavity, and the plurality of glue injection ports are connected to the glue injection ohmic tube 3, so as to provide more uniform resin for the guide net 2 in the extension direction of the mold cavity. The plurality of glue injection ports are specifically arranged at intervals along the extension direction of the mold cavity on the rear edge UD mold 1, and the plurality of glue injection ports on the rear edge UD mold 1 are arranged symmetrically along the extension direction of the mold cavity. The plurality of glue injection ports are connected to the glue injection ohmic tube 3 through corresponding connecting tubes, and the interval between two connecting tubes on the glue injection ohmic tube 3 is the same as the interval between two glue injection ports. The plurality of glue injection ports are connected to the online injection equipment through the glue injection tube to provide resin in the glue injection ohmic tube 3.

[0037] The guide net 2 is fixed to the mold cavity by a fixing part, and the fixing part can be a double-sided cloth-based tape to prevent the guide net 2 from sliding and deflecting. The vacuum bag film is a double-layer bag film structure. Specifically, before the infusion, the first layer of bag film is laid, and the sealing strip is used to seal around the rear edge UD mold 1. The pre-connected vacuum pump is turned on, and the first layer of bag film is tightened. Then, the second layer of bag film is laid, and the sealing strip is used to seal around the rear edge UD mold 1. After the second layer of bag film is tightened, a vacuum pressure gauge is connected to the injection port near the root of the mold cavity. When the pressure value on the vacuum pressure gauge reaches above -950mbar, the vacuum pump valve is closed for a pressure test. The pressure is maintained for 10 minutes, and the pressure drop is ≤15mbar. Then the corresponding infusion equipment is connected for infusion.

[0038] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0039] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A prefabricated wind turbine blade trailing edge UD infusion system, characterized by comprising: A trailing edge UD mold (1); the trailing edge UD mold (1) has a mold cavity for molding the trailing edge UD; A guide net (2); the guide net (2) is laid in the mold cavity, and the guide net (2) is laid from the bottom of the mold cavity along the side of the mold cavity to the top side of the rear edge UD mold (1) on one side of the mold cavity chord upward, and the guide net (2) is located at the bottom of the mold cavity on the other side of the mold cavity chord upward and has a gap I (201) between it and the side of the mold cavity; A glue injection ohmic tube (3), the glue injection ohmic tube (3) being located on one side of the top of the trailing edge UD mold (1) and being arranged on the guide net (2); A glass fiber cloth layer (4), the glass fiber cloth layer (4) being laid in the mold cavity and arranged above the area of ​​the guide net (2) located at the bottom of the mold cavity; An air extraction bag (5), the air extraction bag (5) being located above the glass fiber cloth layer (4) and being laid from the blade root position of the mold cavity to the blade tip position in the mold cavity expansion direction, the air extraction bag (5) having a gap II (501) between the side close to the injection ohm tube (3) and the corresponding mold cavity side surface on both sides in the mold cavity chord direction, and in the projection in the plumb bob direction, the guide net (2) and the gap I (201) have an overlapping area; Vacuum bag film, set the trailing edge on top of the UD mold (1).

2. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 1, characterized in that: The vacuum bag (5) has a gap III (502) between the side away from the injection ohmic tube (3) and the corresponding side of the mold cavity on both sides in the chord direction of the mold cavity, and the size of the gap III (502) is smaller than the size of the gap II (501).

3. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 1 or 2, characterized in that: The vacuum bag (5) is connected to a plurality of vacuum pipes, and the vacuum pipes are arranged at intervals.

4. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 1 or 2, characterized in that: A perforated isolation membrane (6) is provided between the guide net (2) and the glass fiber cloth layer (4), and between the vacuum bag (5) and the glass fiber cloth layer (4).

5. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 4, characterized in that: The perforated isolation membrane (6) located between the guide net (2) and the glass fiber cloth layer (4) covers the bottom of the mold cavity and one side of the mold cavity where the guide net (2) is located.

6. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 5, characterized in that: A demoulding cloth (7) is provided between the perforated isolation membrane (6) and the glass fiber cloth layer (4).

7. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to claim 6, characterized in that: The side surface of the demoulding cloth (7) is laid along the side surface of the mold cavity to the top of the rear edge UD mold (1).

8. The prefabricated wind turbine blade trailing edge UD infusion system according to any one of claims 1, 2, 5-7, characterized in that: It also comprises a plurality of glue injection ports, wherein the glue injection ohmic tube (3) is arranged on the flow guide net (2) to extend along the span direction of the mold cavity, the plurality of glue injection ports are arranged at intervals along the span direction of the mold cavity, and the plurality of glue injection ports are all connected to the glue injection ohmic tube (3).

9. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to any one of claims 1, 2, 5-7, characterized in that: The guide net (2) is fixed to the mold cavity via a fixing piece.

10. The pouring system for the trailing edge UD of a prefabricated wind turbine blade according to any one of claims 1, 2, 5-7, characterized in that: The vacuum bag film is a double-layer bag film structure.

Images