CN113492542A - Blade pouring process method and pouring system - Google Patents
Blade pouring process method and pouring system Download PDFInfo
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- CN113492542A CN113492542A CN202110765284.3A CN202110765284A CN113492542A CN 113492542 A CN113492542 A CN 113492542A CN 202110765284 A CN202110765284 A CN 202110765284A CN 113492542 A CN113492542 A CN 113492542A
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- 238000002347 injection Methods 0.000 claims abstract description 88
- 239000007924 injection Substances 0.000 claims abstract description 88
- 230000010412 perfusion Effects 0.000 claims abstract description 27
- 239000000243 solution Substances 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 13
- 239000004814 polyurethane Substances 0.000 claims description 13
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/082—Blades, e.g. for helicopters
- B29L2031/085—Wind turbine blades
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a leaf perfusion process method and a perfusion system, wherein the process method sequentially comprises the following steps: laying a structural layer for forming the blade in the inner cavity of the mould; the mould comprises a blade root area, a blade body area and a blade tip area; a flow guide system is arranged above the structural layer, the flow guide system comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, and the flow channels of the blade root area and the blade body area are not communicated; a plurality of glue injection ports are formed in the plurality of flow channels; arranging a vacuum system to provide a vacuum environment for the inner cavity of the mold; vacuum glue injection; and (5) curing and demolding. The invention can reduce the risk of resin gel solidification in the glue injection process, improve the blade forming stability, reduce the contact with personnel and the external air of water in the injection process, save the use amount of resin and a flow guide net, protect the environment, save resources, reduce the injection time and accurately control the glue injection of each area.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a blade pouring process method and a pouring system.
Background
Wind energy is considered one of the cleanest, most environmentally friendly energy sources presently available, and wind turbines have been in demand in the marketplace. At present, the fan blades are made of epoxy resin in a large scale and are formed by adopting a Vacuum Assisted Resin Transfer Molding (VARTM) technology, and the VARTM has the advantages of high production efficiency, high quality stability, high mechanical strength, small resin consumption, environmental friendliness and the like. Due to the high viscosity of the epoxy resin, larger channels are required to ensure the dispersion speed of the resin. The resin remained in the flow guide pipe and the flow guide net is removed after being cured, and becomes waste, which causes cost waste and environmental pollution.
The fan blade made of the polyurethane composite material has the advantages of low cost and better mechanical property. However, polyurethane is sensitive to water and has certain irritation to human skin, so that the requirement of polyurethane on the sealing property of an infusion system is higher, the viscosity and the operable time of polyurethane resin are much lower than those of epoxy resin, infusion wrapping is easy to cause, dry yarns, semi-dry yarns and other defects are formed, vacuum infusion needs to be completed in a short time, the infusion quality is guaranteed, and the requirements on infusion operation and arrangement of a runner system are higher.
Disclosure of Invention
The invention aims to reduce the contact of resin with personnel and outside air in the blade infusion process, improve the product quality, avoid harming the health of operators and quickly and effectively preserve the quality and quantity by optimizing a vacuum infusion diversion system and a vacuum system, thereby completing the resin infusion of a reinforced structure. Reduce the resin residue in the auxiliary materials (flow guide pipe and flow guide net), and reduce the waste of the materials and the pollution to the environment.
In order to achieve the purpose, the invention provides a blade perfusion process method and a perfusion system, wherein the process method sequentially comprises the following steps:
step 1: laying a structural layer for forming the blade in the inner cavity of the mould; the mould comprises a blade root area, a blade body area and a blade tip area;
step 2: a flow guide system is arranged above the structural layer, the flow guide system comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, and the flow channels in the blade root area and the blade body area are not communicated so as to improve the glue injection quality; a plurality of glue injection ports are formed in the plurality of flow channels;
and step 3: arranging a vacuum system to provide a vacuum environment for the inner cavity of the mold;
and 4, step 4: vacuum glue injection;
and 5: and (5) curing and demolding.
And the flow channel is laid along the length direction of the structural layer. Preferably, the flow passage interval between the blade root area and the blade body area is 30-100 mm.
Preferably, the diversion system further comprises a diversion net, and the diversion net is arranged below the flow passage and corresponds to the position of the flow passage.
Preferably, the blade body area comprises a main beam area and other areas of the blade body; the flow guide net is fully paved in a blade root area, a girder area and a blade tip area to form a blade root area flow guide net, a girder area flow guide net and a blade tip area flow guide net respectively; the flow guide net is laid in narrow width in other areas of the blade body to form the flow guide net in other areas of the blade body, so that the problem of poor perfusion and infiltration possibly caused by the large-area use of the flow guide net is avoided.
Preferably, the width of the main beam area flow guide net exceeds the width of the main beam by 60-100 mm; the width of the flow guide net in other areas of the blade body is 100-300 mm.
Preferably, each runner is provided with a glue injection port, and the glue injection ports are arranged in the width direction in the blade root area, the blade body area and the blade tip area side by side.
Preferably, the vacuum system comprises a vacuum bag film and a plurality of vacuum pipelines.
Preferably, the vacuum pipeline is formed by connecting at least a plurality of pipelines, three-way and/or four-way joints and control valves and is used for blade perfusion; one end of the four-way connector is connected with the automatic glue injection equipment, the other end of the four-way connector is used for being connected with each glue injection port, the other end of the four-way connector is used for being externally connected with a vacuum pump, and the other end of the four-way connector is used for being connected with a vacuum meter and used for vacuum pressure maintaining.
Preferably, one end of the four-way joint, which is used for connecting the glue injection port, is a main glue injection pipeline, and the main glue injection pipeline is arranged in a partition manner according to the area where the glue injection port is located.
Preferably, the vacuum bag film comprises a first vacuum bag film, a second vacuum bag film; the first vacuum bag film is laid on the outer surface of the diversion system, is in close contact with a parting surface of the mold and is used for forming a sealed space; the second vacuum bag film is laid on the first vacuum bag film.
Preferably, an air guide net is further laid between the first vacuum bag film and the second vacuum bag film, the width of the air guide net is 100-300mm, and the air guide net is laid in an S shape or a W shape.
Preferably, in the vacuum glue injection in step 4, the injected glue solution is polyurethane. After step 3 and before step 4, the air tightness needs to be checked, and heating and dehumidification are needed to prevent the polyurethane from reacting with water and/or diffusing into the air during glue injection.
The invention also discloses a blade perfusion system, which is used for the blade perfusion process method and comprises the following steps:
the mould is used for laying a structural layer for forming the blade in an inner cavity of the mould, and the mould comprises a blade root area, a blade body area and a blade tip area;
the flow guide system is arranged above the structural layer and comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, the flow channels of the blade root area and the blade body area are not communicated, and a plurality of glue injection ports are formed in the flow channels;
and the vacuum system is used for providing a vacuum environment for the inner cavity of the mold.
The invention has the technical effects that aiming at the characteristics of different thicknesses of different areas of the blade, the runner arrangement and the vacuum pipeline control are carried out in different areas, mutual noninterference is realized, the risk of resin gel solidification in the glue injection process can be reduced, the contact of polyurethane with personnel, water and air in the injection process is reduced, the use amount of resin and a flow guide net is saved, the defect of forming dry yarns or semi-dry yarns is avoided, the forming stability of the blade is improved, the environment is protected, the resources are saved, the injection time can be reduced, and the glue injection of each area is accurately controlled.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a flow chart of a vacuum infusion molding process of a polyurethane blade in example 1;
FIG. 3 is a schematic view showing a layout of a blade flow path in embodiment 1;
FIG. 4 is a schematic view showing the vacuum line connection in example 1;
FIG. 5 is a view showing a structure of a blade layer in example 1.
Reference numerals: 11-pre-dehumidification multiaxial glass fiber fabric, 12-low-water-content light sandwich material, 13-pre-dehumidification uniaxial reinforcing fiber, 14-main beam, 22-demoulding cloth, 23-flow guide net, 231-blade root region flow guide net, 232-blade body other region flow guide net, 233-main beam region flow guide net, 234-blade tip region flow guide net, 24-isolation film, 25-flow channel, 251-blade root region flow channel, 252-blade body region flow channel, 253-blade body other region flow channel, 26-glue injection port, 27-exhaust felt, 32-first vacuum bag film, 32' -second vacuum bag film, 33-vacuum pipeline, 331-steel wire hose, 332-control valve, 333-four-way joint, 334-glue injection induction device and 335-three-way joint, 336-PP hard pipe, 337-external vacuum pump, 338-automatic glue injection equipment and 339-vacuum meter.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses a vacuum infusion process method for a blade. As shown in fig. 1, the process method comprises the following steps in sequence:
step 1 (S1): laying a structural layer for forming the blade in the inner cavity of the mould; the mould comprises a blade root area, a blade body area and a blade tip area;
step 2 (S2): a flow guide system is arranged above the structural layer, the flow guide system comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, the flow channels of the blade root area and the blade body area are not communicated, and a plurality of glue injection ports are formed in the flow channels;
step 3 (S3): arranging a vacuum system to provide a vacuum environment for the inner cavity of the mold;
step 4 (S4): vacuum glue injection;
step 5 (S5): and (5) curing and demolding.
Because the difference in thickness of different parts of the blade has a great influence on the speed of resin pouring, the pouring in different areas can improve the pouring quality and speed. Therefore, the vacuum infusion process of the blade is realized by the wind power blade mould comprising a blade root area, a blade body area and a blade tip area, wherein the blade root area refers to the position of 0-5% of the longitudinal length of the mould, the blade body area refers to the position of 5-80% of the longitudinal length of the mould, and the blade tip area is formed in the backward direction. The blade body region includes a main beam region and other regions of the blade body. The mold consists of an upper mold and a lower mold, and the opposite surface of the butt joint of the upper mold cavity and the lower mold cavity is a parting surface.
The following description is given with reference to specific examples.
Example 1
The technological process of polyurethane vacuum infusion is shown in figure 2:
1) laying a structural layer in the inner cavity of the mould, opening the mould and preheating:
the laying structure layer comprises: placing a pre-dehumidification multiaxial glass fiber fabric 11, a low-water-content light sandwich material 12, pre-dehumidification uniaxial reinforcing fibers 13 and a main beam 14. Wherein the low-water content light sandwich material 12 is preferably PVC or PET.
The specific laying method comprises the following steps: firstly, laying 2-10 layers of multiaxial glass fiber fabrics in the blade body and blade tip region, wherein 3 layers are laid in the example, and 20-100 layers of pre-dehumidification multiaxial glass fiber fabrics 11 are laid in the blade root region; then 10-50 layers of pre-dehumidification uniaxial reinforced fiber 13 are laid, then a main beam 14 is placed on the multiaxial glass fiber fabric, a PET foam board (low-moisture light sandwich material 12) is laid according to a conventional mode, then 10-50 layers of pre-dehumidification uniaxial reinforced fiber 13 are laid, then 2-10 layers of pre-dehumidification multiaxial glass fiber fabric 11 are laid in the blade body and blade tip areas, 3 layers are optimally laid, and 20-100 layers of pre-dehumidification multiaxial glass fiber fabric 11 are laid in the blade root area. The paving layer structure is in a symmetrical structure on the front and back surfaces of the PET foam board and the main beam 14.
The mold preheating temperature is preferably 30 to 50 ℃.
2) Arranging a flow guide system:
as shown in fig. 3, the arrangement of the diversion system comprises the following steps of sequentially laying above the structural layer: a release fabric 22, an isolation film 24 and a flow guide net 23 with a penetration function; then, a plurality of flow passages 25 are laid on the flow guide net 23, the flow passages 25 are formed by arranging flow guide pipes in a specific mode, the flow passages 25 are provided with a plurality of glue injection ports 26, and then an exhaust felt 27 is laid.
The release fabric 22 and the release film 24 are laid to enable the cured product to be released better. In this example, the release fabric 22 is made of polyester, has low moisture content, is beneficial to the penetration of polyurethane resin, and can also improve the roughness of the surface of the product after the release. Preferably, the release fabric 22 is laid in an area where a next bonding process is required. The separation membrane 24 has a filtering and permeating effect on the glue solution mixture. In this example, the separator 24 is a polyolefin resin plastic film having holes, and the hole diameter is 1.1 mm.
In order to better play a role in guiding flow, the flow guiding net 23 is fully laid in places with thick layers, such as the root area, the girder area and the blade tip area, and comprises a root area flow guiding net 231, a girder area flow guiding net 233 and a blade tip area flow guiding net 234. The flow guide net 232 in other areas of the blade body is not fully paved, and is paved in a narrow width mode, so that the defects that the flow guide net 23 is used in a large area, the perfusion and infiltration are poor, dry yarns and semi-dry yarns are formed and the like are avoided. The width of the main beam area flow guide net 233 exceeds the width of the main beam by 60-100mm so as to ensure the pouring quality of the main beam area; in this example, the width of the main beam is 630mm, and the area flow guide net 233 of the main beam is 700 mm; the width of the flow guide net 232 in other areas of the blade body is preferably 100-300 mm.
In some embodiments, the flow guiding net 23 is made of a woven net material with high permeability, for example, the flow guiding net 23 may be a three-dimensional net structure woven by a high density polyethylene material. In some embodiments, the flow-guiding net with different square gram weights can be selected according to the required flow rate of the formed product, preferably 100-200g/m2And g weight. In this example, 160g/m is selected2。
In some embodiments, the main beam region flow guide net 233/other blade region flow guide nets 232 and the blade root region flow guide net 231 are disconnected in the length direction of the blade mold, and the interval is 30-100mm, so that the main beam region flow guide net/other blade region flow guide nets are used for regional perfusion, and the perfusion quality is improved.
The laying of the flow channels 25 corresponds to the laying of the flow-guide net 23. The runner 25 is laid above the flow guide net 23, the runner 25 is laid along the length direction of the structural layer, and the runner is divided into a blade root region runner 251, a main beam region runner 252 and a blade body other region runner 253 according to the positions of the runner in the mold cavity. The root region flow channel 251 is laid in its entirety on the root region flow guide network 231. The blade root area flow passage 251 is provided with 2-8 guide pipes, in this example, 6 guide pipes, wherein 2 guide pipes are arranged at two sides of the main beam, and the rest guide pipes are symmetrically and uniformly distributed at two sides at an interval of 50-70 cm; 4 strips are arranged in the blade body area, and 2 strips are distributed on two sides of the main beam; the other 2 strips are respectively positioned at the front edge and the rear edge of the main beam, the 2 strips are positioned at the central positions of the front edge and the rear edge of the main beam in the width direction along the width direction of the die by taking the main beam as a boundary, and the flow channel at the rear edge side is extended from the blade body area to the tip of the blade tip area. The blade root area and the blade body area are separated by 30-100mm, and the blade root area and the blade body area correspond to the blade root area flow guide net 231, the main beam area flow guide net 233 and the other blade body area flow guide nets 232.
In some embodiments, the duct of the flow channel 25 is made of PVC thick pipe, and has an omega-shaped cross section and a diameter of 16-25 mm.
In some embodiments, the runner 25 is provided with a plurality of glue injection ports 26 for injecting the polyurethane resin into the flow guide tube and further into the structural layer, and the glue injection ports 26 are connected to the vacuum pipeline 33. The position of the glue injection port 26 is affected by the following factors: each flow channel 25 is ensured to be communicated (including direct communication or indirect communication) with the glue injection port 26, so that glue can quickly fill all the flow channels when glue injection starts; the glue injection time is short, and the efficiency is improved; is economical and has low cost. The layer of the blade root area is thicker, so that more glue injection openings can be arranged in the area, for example, 2-6 glue injection openings are arranged; the length of the blade body area is longer, 4-6 parallel blades can be arranged in the width direction of the maximum width area of the die, and 2-4 blades are arranged in the part close to the blade tip area; the blade tip area is thinner in layer, and less glue injection ports can be considered to be arranged, for example, 1-3 glue injection ports can be arranged. Preferably, the glue injection port 26 is a PVC Ω -shaped tee.
In some embodiments, the exhaust felt 27 is a glass fiber felt or a woven glass fiber cloth, and is laid at the end of the runner 25 for guiding out bubbles in the vacuum pipeline and the flow guide pipe during glue injection.
3) Arranging a vacuum system:
arranging a vacuum system on the outer surface of the diversion system in the step 2); this is the most critical step in the vacuum infusion process; the vacuum system can be a single vacuum system or a double vacuum system according to requirements, wherein the width of the parting surface is 10-30 cm.
As shown in fig. 4, each glue injection port 26 is connected to a vacuum pipeline 33; the vacuum pipeline 33 is formed by connecting a steel wire hose 331, a PP hard pipe 336, a three-way joint 335, a four-way joint 333 and a control valve 332 and is used for polyurethane perfusion.
In some embodiments, one end of the four-way joint 333 is connected to the automatic glue injection device 338, one end of the four-way joint is used for being connected to each glue injection port 26, one end of the four-way joint is used for being externally connected to the vacuum pump 337, and one end of the four-way joint is used for being connected to the vacuum meter 339 for vacuum pressure maintaining, wherein the end used for being connected to the glue injection ports 26 is a main glue injection pipeline, the main glue injection pipeline is correspondingly divided into a blade root region glue injection pipeline, a blade body region glue injection pipeline and a blade tip region glue injection pipeline according to the region where the glue injection ports are located, a glue injection sensing device 334 is connected before the sub-region glue injection ports are connected for sensing and controlling the resin supply amount of each region, and the glue injection ports of each region are connected with a control valve 332 for individually controlling the corresponding glue injection ports 26 of each region.
In some embodiments, the vacuum system is configured as a dual vacuum system comprising a first vacuum bag film 32 and a second vacuum bag film 32'. The first vacuum bag film 32 and the second vacuum bag film 32' are preferably colorless transparent materials; the mould parting surface with the vacuum bag membrane edge department of meeting has seted up the vacuum mouth, the vacuum mouth is connected with the vacuum pipeline 33 of laying on the mould to there is the vacuum pump, is used for vacuum pressurize and evacuation secondary dehumidification.
As shown in fig. 5, a first vacuum bag film 32 is covered on the outer surface of the fluid guide system, a sealing rubber strip is adhered to the joint of the edge of the first vacuum bag film 32 and the parting line of the mold, the edge of the first vacuum bag film 32 is tightly contacted with the parting line of the mold, so that a mold cavity between the first vacuum bag film 32 and the mold forms a vacuum-pumping sealed space, the first vacuum bag film 32 at the glue injection port 26 is punctured, the glue injection port 26 is exposed, and is connected with a vacuum pipeline 33, and the first vacuum bag film 32 is pre-tightened to reserve a time adjustment structure layer and positions of the fluid guide net 23 and the flow channel 25.
In some embodiments, an air-conducting mesh (not shown) is laid over the first vacuum bag film 32. Preferably, the air guide net is a breathing cotton or a flow guide net with the width of 100-. And laying a second vacuum bag film 32 'after the completion, wherein the edge of the second vacuum bag film 32' exceeds the first vacuum bag film 32, and the second vacuum bag film is tightly adhered with the sealing adhesive tape to form a double-vacuum system.
4) Vacuumizing, checking air tightness, heating and dehumidifying:
starting the mold vacuum pump and the external vacuum pump 337, and pumping the sealed space of the single vacuum system or the first sealed space of the double vacuum system formed in the above steps into a negative pressure state, wherein the negative pressure uniformly acts on the structural layer laid in the mold cavity to make the structural layer compact; and after the vacuum degree reaches-1000 mbr, closing the vacuum valve and the mold vacuum pump valve to perform air tightness inspection, connecting the vacuum meter 339 to a reserved port of the four-way connector 333, maintaining the pressure for 10min, wherein the air tightness is qualified when the vacuum degree drop value is less than 15mbr, and heating, dehumidifying and injecting glue after the air tightness is qualified. And after the pressure maintaining is qualified, opening the vacuum pump and the vacuum valve of the mold again to vacuumize the structural layer for secondary dehumidification, wherein the temperature is 30-45 ℃, the temperature is 35 ℃ in the example, and the time is 1-3h, and the time is 2h in the example.
5) Injecting glue:
uniformly mixing the components A, B in proportion in the pouring equipment 33, opening the control valves 332 in the areas on the vacuum pipeline 33 as required, and making the mixture flow to the parts of the system and gradually permeate the structural layer after the mixture is injected and filled into the flow channel through the glue injection pipe under the action of the external atmospheric pressure; the components of the polyurethane A, B are respectively polyol and isocyanate, and the concrete operation is as follows:
a) preparing a glue solution mixture: the polyurethane is mixed in the automatic glue injection equipment 338 according to the mixing ratio of A to B being 100 to (80-86), in this example 100 to 84;
b) adjusting the flow value of the glue injection equipment to be 30-45kg/min, and starting the glue injection machine;
c) opening a main pipeline control valve of the glue injection pipeline to enable glue solution to preferentially enter the glue injection induction device 334, injecting the glue solution into the pipelines of each area through the glue injection induction device 334, and injecting glue through controlling the control valve of each area;
d) when the glue solution mixture overflows from a vacuum port of the sealed space of the single vacuum system or the first sealed space of the double vacuum system, determining that the glue solution mixture completely impregnates the reinforcing material layer; and closing the valve on the glue injection pipe to finish glue injection.
The gel content of the product formed by the process of the invention depends on factors such as the value of vacuum degree and the type of fabric, and is generally between 15 and 35 percent. The mold filling time is related to factors such as the specification and model of a product, the type of glue solution, the ambient temperature, the mold temperature, the vacuum degree in the mold cavity and the like, the same glue solution is adopted for filling the mold for the product with the same specification and model, and when the ambient temperature and the vacuum degree in the mold cavity are the same, the mold temperature is higher, and the mold filling time is shorter; the lower the mold temperature is, the longer the mold filling time is; certainly, the temperature cannot be too high, otherwise, the glue solution can react quickly, the viscosity is increased quickly, and glue injection cannot be finished; the heating temperature of the mould during glue injection is different according to the type of the glue solution. Aiming at the adopted glue solution mixture, the temperature of the mould is controlled to be 30-40 ℃ when glue injection is started, the temperature of the mixed glue solution of the automatic glue injection machine is controlled to be 15-20 ℃, and the time for completing mould filling is within 1.5 h.
6) Heating curing/demolding:
after the glue injection is finished, a heating and curing program is started, and the heating temperature and the heating time adopted during curing are different according to the difference between the selected resin and the curing agent. Aiming at the polyurethane system resin adopted by the invention, the product is pre-cured at the constant temperature of 50 ℃ for 1-2h, in this case, 2 h; then the temperature is raised to 70 ℃ and the temperature is kept constant for 1-2h, and the product is solidified, in this case for 2 h. Then cooling and demoulding; after the molded product is naturally cooled to room temperature, the demolding cloth 22, the isolation film 24, the flow guide net 23, the first vacuum bag film 32, the second vacuum bag film 32', the flow channel 25, the glue injection opening 26, the glue injection pipe connected with the glue injection opening 26 and the like are torn off, and the whole vacuum leading-in molding process is completed.
Compared with the pouring method of fully laying the flow guide net, the pouring method of laying the flow guide net in a narrow range in other areas of the blade body can save 150 kg of resin and 300kg of resin for producing each blade.
Example 2
A blade infusion system for infusing epoxy resin into a blade mold, the system comprising: a mould, a flow guide system and a vacuum system. The method and the sequence of laying the die, the diversion system and the vacuum system are the same as those of the embodiment 1.
In conclusion, the invention discloses a vacuum infusion process method for blades, which lays flow guide nets in narrow width in other areas of a blade body and has good technical effects. The method saves the using amount of resin and the using amount of the flow guide net, avoids the defect of forming dry yarn or semi-dry yarn, improves the forming stability of the blade, is beneficial to protecting the environment, saves resources, can reduce the pouring time, and accurately controls the glue injection of each area.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (14)
1. A leaf perfusion process method is characterized by sequentially comprising the following steps:
step 1: laying a structural layer for forming the blade in the inner cavity of the mould; the mould comprises a blade root area, a blade body area and a blade tip area;
step 2: a flow guide system is arranged above the structural layer, the flow guide system comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, and the flow channels of the blade root area and the blade body area are not communicated; a plurality of glue injection ports are formed in the plurality of flow channels;
and step 3: arranging a vacuum system to provide a vacuum environment for the inner cavity of the mold;
and 4, step 4: vacuum glue injection;
and 5: and (5) curing and demolding.
2. A leaf perfusion process as claimed in claim 1, wherein: the flow channels are laid along the length direction of the structural layer, and the interval between the flow channels of the blade root area and the blade body area is 30-100 mm.
3. A leaf perfusion process as claimed in claim 1, wherein: the flow guide system also comprises a flow guide net which is arranged below the flow passage and corresponds to the position of the flow passage.
4. A leaf perfusion process as claimed in claim 3, wherein: the blade body area comprises a main beam area and other areas of the blade body; the flow guide net is fully paved in a blade root area, a girder area and a blade tip area to form a blade root area flow guide net, a girder area flow guide net and a blade tip area flow guide net respectively; and laying the blades in other areas in a narrow way to form a flow guide net in other areas of the blades.
5. A leaf perfusion process as claimed in claim 4, wherein: the width of the flow guide net in the main beam area exceeds the width of the main beam by 60-100mm, so that the pouring quality of the main beam is ensured; the width of the flow guide net in other areas of the blade body is 100-300 mm.
6. A leaf perfusion process as claimed in claim 1, wherein: each runner is provided with a glue injection port, and the glue injection ports are arranged in the width direction in the blade root area, the blade body area and the blade tip area side by side.
7. A leaf perfusion process as claimed in claim 1, wherein: the vacuum system comprises a vacuum bag film and a plurality of vacuum pipelines.
8. A leaf perfusion process as claimed in claim 7, wherein: the vacuum pipeline is formed by connecting at least a plurality of pipelines, three-way and/or four-way joints and control valves and is used for filling the blades; one end of the four-way connector is connected with the automatic glue injection equipment, the other end of the four-way connector is used for being connected with each glue injection port, the other end of the four-way connector is used for being externally connected with a vacuum pump, and the other end of the four-way connector is used for being connected with a vacuum meter and used for vacuum pressure maintaining.
9. A leaf perfusion process as claimed in claim 8, wherein: the four-way joint is used for connecting one end of the glue injection port and is a main glue injection pipeline, and the main glue injection pipeline is arranged in a partition mode according to the area where the glue injection port is located.
10. A leaf perfusion process as claimed in claim 7, wherein: the vacuum bag film comprises a first vacuum bag film and a second vacuum bag film; the first vacuum bag film is laid on the outer surface of the diversion system, is in close contact with a parting surface of the mold and is used for forming a sealed space; the second vacuum bag film is laid on the first vacuum bag film.
11. A leaf perfusion process as claimed in claim 10, wherein: and an air guide net is also laid between the first vacuum bag film and the second vacuum bag film, the width of the air guide net is 100-300mm, and the air guide net is laid in an S shape or a W shape.
12. A leaf perfusion process as claimed in any one of claims 1 to 11, wherein: in the vacuum glue injection in the step 4, the injected glue solution is polyurethane.
13. A leaf perfusion process as claimed in claim 12, wherein: after step 3 and before step 4, the method further comprises the steps of checking airtightness, heating and dehumidifying.
14. A leaf blade perfusion system for use in a leaf blade perfusion process as claimed in any one of claims 1 to 11, wherein: the system comprises:
the mould is used for laying a structural layer for forming the blade in an inner cavity of the mould, and the mould comprises a blade root area, a blade body area and a blade tip area;
the flow guide system is arranged above the structural layer and comprises a plurality of flow channels, the flow channels are respectively arranged in the blade root area, the blade body area and the blade tip area, the flow channels of the blade root area and the blade body area are not communicated, and a plurality of glue injection ports are formed in the flow channels;
and the vacuum system is used for providing a vacuum environment for the inner cavity of the mold.
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|---|---|---|---|---|
| US5156786A (en) * | 1990-07-02 | 1992-10-20 | Hudson Products Corporation | Method for manufacuring fan blades |
| CN101456256A (en) * | 2009-01-09 | 2009-06-17 | 中材科技风电叶片股份有限公司 | Megawatt level composite material wind electricity blade vacuum guiding and forming technique |
| CN207630568U (en) * | 2017-11-06 | 2018-07-20 | 中材科技（酒泉）风电叶片有限公司 | A kind of sectional-type blade reperfusion structure |
| CN109968689A (en) * | 2019-04-25 | 2019-07-05 | 株洲时代新材料科技股份有限公司 | A kind of perfusion system and pouring and forming process for pre-buried type wind electricity blade blade root |
| CN112848390A (en) * | 2020-12-29 | 2021-05-28 | 中复连众(安阳)复合材料有限公司 | Vacuum infusion method for wind driven generator blade |
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2021
- 2021-07-06 CN CN202110765284.3A patent/CN113492542A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156786A (en) * | 1990-07-02 | 1992-10-20 | Hudson Products Corporation | Method for manufacuring fan blades |
| CN101456256A (en) * | 2009-01-09 | 2009-06-17 | 中材科技风电叶片股份有限公司 | Megawatt level composite material wind electricity blade vacuum guiding and forming technique |
| CN207630568U (en) * | 2017-11-06 | 2018-07-20 | 中材科技（酒泉）风电叶片有限公司 | A kind of sectional-type blade reperfusion structure |
| CN109968689A (en) * | 2019-04-25 | 2019-07-05 | 株洲时代新材料科技股份有限公司 | A kind of perfusion system and pouring and forming process for pre-buried type wind electricity blade blade root |
| CN112848390A (en) * | 2020-12-29 | 2021-05-28 | 中复连众(安阳)复合材料有限公司 | Vacuum infusion method for wind driven generator blade |
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Application publication date: 20211012 |