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CN118456734B - Systematic heating and curing method and device for modularized blades - Google Patents

Systematic heating and curing method and device for modularized blades Download PDF

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Publication number
CN118456734B
CN118456734B CN202410926304.4A CN202410926304A CN118456734B CN 118456734 B CN118456734 B CN 118456734B CN 202410926304 A CN202410926304 A CN 202410926304A CN 118456734 B CN118456734 B CN 118456734B
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CN
China
Prior art keywords
blade
hot air
heating
cavity
electric heating
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Application number
CN202410926304.4A
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Chinese (zh)
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CN118456734A (en
Inventor
谈源
徐峰
刘林明
李春惠
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Changzhou New Intelligent Technology Co Ltd
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Changzhou New Intelligent Technology Co Ltd
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Priority to CN202410926304.4A priority Critical patent/CN118456734B/en
Publication of CN118456734A publication Critical patent/CN118456734A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/045Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/08Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
    • B29L2031/082Blades, e.g. for helicopters
    • B29L2031/085Wind turbine blades

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The invention relates to the technical field of wind power blades, in particular to a modular blade systematic heating and curing method and device, wherein the method comprises the following steps: an electric heating layer is arranged at the splicing position of the blade modules, the electric heating layer at least covers the outer wall of the blade and the inner wall of the cavity at the splicing position, and the electric heating layer is used for heating the structural adhesive at the splicing position; the hot air circulating device is arranged in the cavity of the blade root and at least comprises a heating air blowing port and a return air port, the heating air blowing port and the return air port enable circulating hot air to be formed in the cavity of the blade, and the circulating hot air heats the whole blade. In the invention, the electric heating layer is electrified and started to heat the structural adhesive at the splicing position. Meanwhile, a hot air circulating device is started, so that hot air circularly flows in the blade cavity, and the temperature of the whole blade is ensured to be uniformly distributed. In this way, the problem of difficult heat curing caused by too long blade length is solved.

Description

Systematic heating and curing method and device for modularized blades
Technical Field
The invention relates to the technical field of wind power blades, in particular to a modular blade systematic heating and curing method and device.
Background
In order to fully utilize wind energy resources, wind driven generators gradually increase in size, and the lengths of blades of the wind driven generators are also continuously increased, so that modularized blade technologies are gradually developed.
The modularized blade is a plurality of modules manufactured in advance, then the modules are transported to the fan installation position, the modules are assembled, during assembly, the modules are usually fixed in an auxiliary mode through structural adhesive, the natural curing time of the structural adhesive is longer, the wind power blade can be cured in an accelerating mode through heating, the length of the wind power blade is longer, and after the structural adhesive is filled into a beam cap and a shell, the heat curing is difficult to realize.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a modular blade systematic heating and curing method and device, so that the problems in the background technology are effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a method of modular blade systematic thermal curing comprising the steps of:
An electric heating layer is arranged at the splicing position of the blade modules, the electric heating layer at least covers the outer wall of the blade and the inner wall of the cavity at the splicing position, and the electric heating layer is used for heating the structural adhesive at the splicing position;
the blade root cavity is internally provided with a hot air circulating device, the hot air circulating device at least comprises a heating air blowing port and a return air port, the heating air blowing port and the return air port enable circulating hot air to be formed in the blade cavity, and the circulating hot air heats the whole blade.
Further, the electric heating layer is arranged when the blade modules are bonded and spliced.
Further, the electric heating layer is a mixed fabric of carbon fiber and glass fiber and is adhered and fixed through structural adhesive.
Further, the electric heating layer at the outer wall of the blade is also covered with a heat preservation layer, heat preservation is carried out during heating, and the heat preservation layer is removed after the heating and solidification are completed.
Further, in the electric heating layer, carbon fibers are warp yarns, glass fibers are weft yarns, power is supplied to two ends of the carbon fibers respectively, and positive and negative electrodes of the power supply are staggered.
Further, the middle cavity of the hot air circulating device in the width direction of the blade is set as the air return port, the cavities at the two ends of the width direction of the blade are set as the heating air blowing port, hot air is blown in from the two ends of the width direction in the blade, moves from the blade root to the blade tip, and moves from the blade tip of the middle cavity in the width direction to the blade root, so that circulation is completed.
Further, relay heating fans are further arranged in cavities at two ends of the blade in the width direction, and the relay heating fans are arranged in the blades of the blade.
Further, after the heat curing is completed, the electrically heated layer is left on the blade for subsequent evaporation of the blade humidity.
The invention also includes a modular blade systematic thermal curing apparatus, using a heating method as described above, comprising:
the electric heating layer is arranged on the outer wall of the blade and the inner wall of the cavity at the joint and covers the joint;
The hot air circulating device is arranged at the cavity of the root of the blade and at least comprises a heating air blowing port and a return air port, wherein the heating air blowing port and the return air port enable circulating hot air to be formed in the cavity of the blade, and the circulating hot air heats the whole blade.
The beneficial effects of the invention are as follows: the invention installs the electric heating layer at each splice, then installs the hot air circulation device in the cavity of the leaf root. And electrifying to start the electric heating layer to heat the structural adhesive at the spliced position. Meanwhile, a hot air circulating device is started, so that hot air circularly flows in the blade cavity, and the temperature of the whole blade is ensured to be uniformly distributed. Through the mode, the structural adhesive at the splicing part can be quickly cured, meanwhile, the integral structural strength and stability of the blade are ensured, and the problem of difficult heating and curing caused by overlong length of the blade is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a cross-sectional view of a blade;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic structural and electrical schematic of an electrically heated layer;
FIG. 5 is a schematic view of hot air circulation along the length of the blade;
FIG. 6 is a partial enlarged view at B in FIG. 5;
fig. 7 is a partial enlarged view at C in fig. 5.
Reference numerals: 1. an electrical heating layer; 11. a carbon fiber; 12. glass fiber; 2. a hot air circulation device; 21. heating the air blowing port; 22. an air return port; 23. a relay heating fan; 3. and a heat preservation layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as being "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1: a method of modular blade systematic thermal curing comprising the steps of:
an electric heating layer 1 is arranged at the splicing position of the blade modules, the electric heating layer 1 at least covers the outer wall of the blade and the inner wall of the cavity at the splicing position, and the electric heating layer 1 is used for heating the structural adhesive at the splicing position;
The hot air circulating device 2 is arranged in the cavity of the blade root, the hot air circulating device 2 at least comprises a heating air blowing port 21 and a return air port 22, the heating air blowing port 21 and the return air port 22 enable circulating hot air to be formed in the cavity of the blade, and the circulating hot air heats the whole blade.
An electric heating layer 1 is arranged at the splicing position of the blade modules. The coverage area of the electric heating layer 1 at least comprises the outer wall of the blade and the inner wall of the cavity at the joint. The electric heating layer 1 can generate heat through electrifying, and heat the structural adhesive at the spliced position, so that the curing process of the structural adhesive is accelerated. Through the heating of the electric heating layer 1, the accurate temperature control of the splicing part can be realized, the structural adhesive is ensured to be uniformly and rapidly solidified, and the splicing quality and efficiency are improved. A hot air circulating device 2 is arranged in the cavity of the root part of the leaf. The hot air circulation device 2 at least comprises a heating air blowing port 21 and a return air port 22. The heating air blowing port 21 is responsible for blowing hot air into the blade cavity, and the return air port 22 is used for recycling circulating hot air. The hot air circularly flows in the cavity to uniformly heat the whole blade. The use of circulating hot air can not only improve the temperature consistency inside and outside the blade, but also avoid the problem of uneven curing of the structural adhesive caused by local overheating or supercooling.
As shown in fig. 2 to 7, in the splicing and fixing process of the modular blade, the electric heating layer 1 is installed at each splicing place, and then the hot air circulation device 2 is installed in the cavity of the root of the blade. And electrifying and starting the electric heating layer 1 to heat the structural adhesive at the splicing position. Meanwhile, the hot air circulating device 2 is started to enable hot air to circulate in the blade cavity, and the temperature of the whole blade is ensured to be evenly distributed. Through the mode, the structural adhesive at the splicing part can be quickly cured, meanwhile, the integral structural strength and stability of the blade are ensured, and the problem of difficult heating and curing caused by overlong length of the blade is solved.
In the present embodiment, the electric heating layer 1 is provided when the blade modules are bonded and spliced.
At the concatenation position of blade module, the mounted position of electrical heating layer 1 has been designed in advance, at the in-process of bonding concatenation, install electrical heating layer 1 in predetermined position, make its blade outer wall and the cavity inner wall that covers concatenation department, when blade module bonds the concatenation, use the structural adhesive to connect the module fixedly, and ensure that electrical heating layer 1 closely laminates concatenation department, electrical heating layer 1 sets up in step when blade module bonds the concatenation, prevent that some blade cavity inner spaces are less after the concatenation, unable reentrant personnel's problem, the efficiency of construction and the quality control level of wind-powered electricity generation project have been improved.
Wherein, the electric heating layer 1 is a mixed fabric of carbon fiber 11 and glass fiber 12, and is adhered and fixed by structural adhesive.
The carbon fiber 11 and glass fiber 12 mixed fabric is selected as the material of the electric heating layer 1, the material has excellent conductivity and mechanical strength, can be uniformly heated and can resist the working environment of the wind power blade, the material of the modularized blade is also a composite material, the carbon fiber 11 and glass fiber 12 mixed fabric is close to or the same as the material of the blade, the structure reinforcement effect can be achieved by covering the blade, and the fixing effect of the electric heating layer 1 is ensured by bonding and fixing the structure adhesive, so that the follow-up electric heating layer 1 is prevented from being separated.
As a preferred embodiment, the electric heating layer 1 at the outer wall of the blade is further covered with a heat insulating layer 3, heat is preserved at the time of heating, and after the completion of heat curing, the heat insulating layer 3 is removed.
In order to improve heating efficiency and uniformity, the electric heating layer 1 at the outer wall of the blade is covered with a heat preservation layer 3, a proper heat preservation material such as heat insulation cotton or heat preservation felt is selected, good heat preservation effect and high temperature resistance are achieved, and the heat preservation material is covered outside the electric heating layer 1. The heat preservation layer 3 should cover comprehensively to closely laminate the electric heating layer 1, with the reduction heat loss, switch on and start carbon fiber 11 and glass fiber 12 mixed fabric electric heating layer 1, heat the structural adhesive of concatenation department. The heat can be effectively maintained by covering the heat preservation layer 3, and the heating efficiency and uniformity are ensured.
In this embodiment, in the electric heating layer 1, the carbon fibers 11 are warp yarns, the glass fibers 12 are weft yarns, and the two ends of the carbon fibers 11 are respectively powered, and the positive and negative electrodes of the power supply are staggered.
Because the blade is longer, prevents that length problem from causing voltage decay, so carry out the power supply at carbon fiber 11 both ends, and adopt the crisscross setting of positive negative pole, prevent the inconsistent problem of heating power, ensure that whole electrical heating layer 1 evenly heats, improve heating efficiency and homogeneity.
In this embodiment, the hot air circulation device 2 is provided with an air return port 22 in the middle cavity in the width direction of the blade, and heating air blowing ports 21 in the two end cavities in the width direction of the blade, and hot air is blown in from the two ends in the width direction of the blade, moves from the blade root to the blade tip, and moves from the blade tip to the blade root in the middle cavity in the width direction, so that circulation is completed.
Through setting up reasonable hot air circulation route, through setting up return air inlet 22 at the middle cavity of blade width direction, the both ends cavity of blade width direction sets up the heating and blows wind gap 21, makes hot-blast from both ends and blows in from the middle cavity backward flow, ensures the even heating in the blade.
Wherein, still be provided with relay heating fan 23 in the both ends cavity of blade width direction, relay heating fan 23 sets up in the leaf of blade. In the both ends cavity of blade width direction, especially in the leaf position of blade (be close to the blade middle part) set up relay heating fan 23, these fans are used for reinforcing the transmission effect of hot-blast, and supplementary inside wind pressure, velocity of flow and temperature decay ensure that hot-blast can evenly distributed in the blade.
As a preference to the above embodiment, after the heat curing is completed, the electrically heated layer 1 is left on the blade for subsequent evaporation of the blade humidity.
After the completion of the heat curing, the electric heating layer 1 is not immediately removed but left on the blade, and the blade is continuously heated by the heating function of the electric heating layer 1 to promote the evaporation of the moisture remaining inside the blade. This helps improving the dry degree of blade, reduces the influence of humidity to blade structure and performance, can make full use of the existing equipment, improves blade drying efficiency, guarantees the stability of blade quality and performance to improve the life of blade.
The embodiment also comprises a modular blade systematic heating and curing device, which uses the heating method as described above, and comprises the following steps:
the electric heating layer 1 is arranged on the outer wall of the blade and the inner wall of the cavity at the joint, and covers the joint;
The hot air circulating device 2 is arranged at the cavity of the root of the blade, and at least comprises a heating air blowing port 21 and a return air port 22, wherein the heating air blowing port 21 and the return air port 22 enable circulating hot air to be formed in the cavity of the blade, and the circulating hot air heats the whole blade.
In the heating and curing process, the electric heating layer 1 is started to heat the structural adhesive at the splicing position, and meanwhile the hot air circulating device 2 is started to enable the heating air blowing port 21 to blow hot air into the blade cavity, and the air return port 22 is used for recovering the hot air to form a circulating hot air system. The electric heating layer 1 provides local heating, the hot air circulation device 2 provides global heating, and the two are complemented with each other to jointly act on the heating and curing process of the blade. The whole process is monitored in real time through monitoring equipment so as to ensure the uniformity and stability of the heating process. By the application of the device and the method, efficient heating and solidification of the modularized blades can be realized, and the construction efficiency and the blade quality of wind power generation projects are improved.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. A method of systematic thermal curing of modular blades, comprising the steps of:
An electric heating layer is arranged at the splicing position of the blade modules, the electric heating layer at least covers the outer wall of the blade and the inner wall of the cavity at the splicing position, and the electric heating layer is used for heating the structural adhesive at the splicing position;
the blade root cavity is internally provided with a hot air circulating device, the hot air circulating device at least comprises a heating air blowing port and a return air port, the heating air blowing port and the return air port enable circulating hot air to be formed in the blade cavity, and the circulating hot air heats the whole blade;
the electric heating layer is a mixed fabric of carbon fiber and glass fiber and is fixed through structural adhesive;
in the electric heating layer, carbon fibers are warp yarns, glass fibers are weft yarns, two ends of the carbon fibers are respectively powered, and power supply positive and negative electrodes are arranged in a staggered manner;
after the heating and curing are finished, the electric heating layer is reserved on the blade and is used for evaporating the humidity of the subsequent blade;
the electric heating layer at the outer wall of the blade is also covered with a heat preservation layer, heat preservation is carried out during heating, and the heat preservation layer is removed after the heating and solidification are completed;
The hot air circulation device is arranged as the air return opening in the middle cavity in the width direction of the blade, the cavities at the two ends in the width direction of the blade are arranged as the heating air blowing openings, hot air is blown in from the two ends in the width direction of the blade, moves from the blade root to the blade tip, and moves from the blade tip to the blade root of the middle cavity in the width direction, so that circulation is completed;
And the cavities at the two ends of the width direction of the blade are also provided with a relay heating fan, and the relay heating fan is arranged in the blade of the blade.
2. The modular blade systematic thermal curing method of claim 1, wherein the electrical heating layer is disposed when the blade modules are adhesively bonded.
3. A modular blade systematic thermal curing apparatus, characterized in that a systematic thermal curing method according to claim 1 or 2 is used, comprising:
the electric heating layer is arranged on the outer wall of the blade and the inner wall of the cavity at the joint and covers the joint;
The hot air circulating device is arranged at the cavity of the root of the blade and at least comprises a heating air blowing port and a return air port, wherein the heating air blowing port and the return air port enable circulating hot air to be formed in the cavity of the blade, and the circulating hot air heats the whole blade.
CN202410926304.4A 2024-07-11 2024-07-11 Systematic heating and curing method and device for modularized blades Active CN118456734B (en)

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CN118456734B true CN118456734B (en) 2024-10-22

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