Wind turbine blade heat dissipation structure and method

Abstract

The application provides a wind power blade heat dissipation structure and method, which comprises a blade body, a cavity is arranged in the blade body, a blade root window is arranged at a blade root end of the blade body and communicates with the cavity, an air vent is arranged on a side wall of the blade body and communicates with the cavity and the outside, and a blower is arranged at the air vent or the blade root window and blows air into the cavity. According to the above scheme, the air vent is additionally arranged on the blade body, so that the cavity of the blade body has two outlets, the blower is arranged at one of the outlets, air flow is blown from one outlet to the other outlet, the hot air flow in the cavity is driven to flow and is blown away from the cavity to perform internal heat dissipation, the outside of the blade body can be naturally cooled or air-cooled, so that uniform heat dissipation of the inside and outside of the blade body is realized, and local deformation caused by uneven heat dissipation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power blades, in particular to a heat dissipation structure and method for wind power blades during demolding. BACKGROUND

[0002] Wind power blades are mostly resin-based glass steel products, and different temperature requirements are required for the blade mold at different processes and time periods. Wind power blades are generally made of composite materials, and the materials used have a glass transition temperature (Tg value), which is generally greater than or equal to 70℃. The production process of wind power blades needs to be heated and cured, and after curing, the temperature needs to be reduced to below 50℃ during demolding to ensure the strength of the blade. At present, large blades weigh more than 20t and are more than 80m long. The blade is long and has a large heat capacity. The existing cooling method is to open the mold and cool the blade naturally or use a fan to cool the blade.

[0003] Chinese patent CN115139435A discloses an opening and closing type wind power blade mold heat dissipation structure, which is a scheme including a mold body, a base, a support frame, a heating pipeline, a floating air guide mechanism, and an opening and closing block. When heat dissipation is needed, the air guide gear block is first driven to rotate by the air guide gear plate, thereby driving the plurality of air guide drive rods to rotate synchronously. Through the rotation of the air guide drive rods, the floating opening and closing plate is separated upward from the upper end of the two sides of the strip-shaped root window connected to the strip-shaped root window in the middle of the mold body accommodating cavity, so that the strip-shaped root window in the middle of the mold body accommodating cavity is opened. Then, the opening and closing block is separated outward from the air passage on both sides of the accommodating cavity, so that the air passage on both sides of the mold body accommodating cavity is opened. Finally, the air guide motor is started to drive the air guide blades to rotate and guide the air, so that the air flows into the air passage on both sides of the accommodating cavity and then flows out from the strip-shaped root window, thereby achieving rapid heat dissipation. However, the essence of this application is to dissipate heat from the mold of the wind power blade to dissipate heat from the wind power blade. The wind power blade is not a solid body, but has an inner cavity. The root of the wind power blade is the outlet of the inner cavity, and the length of the inner cavity is slightly shorter than the total length of the blade. A large amount of air is accumulated inside. When the application is compared with the application of dissipating heat from the surface of the wind power blade during the curing and molding of the wind power blade, it is difficult to dissipate heat from the inside of the wind power blade. If the air in the cavity is directly blown from the root window of the wind power blade during the curing and molding of the wind power blade, the heat inside the long cavity is still easy to accumulate, and even the uneven heat dissipation of the wind power blade during the curing and molding of the wind power blade may cause local deformation due to thermal expansion and contraction. SUMMARY

[0004] The purpose of the present application is to provide a wind power blade heat dissipation structure which can dissipate heat from the inner cavity of the wind power blade during the curing and molding of the wind power blade.

[0005] Another object of the present application is to provide a wind power blade heat dissipation method which can accelerate the heat dissipation speed of the wind power blade during the curing and forming of the wind power blade.

[0006] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0007] A wind power blade heat dissipation structure, comprising a blade body, a cavity is formed in the inside of the blade body, a blade root window is formed at the blade root end of the blade body and is in communication with the cavity, an air vent is formed on the side wall of the blade body and is in communication with the outside and the cavity, and a blower is arranged at the air vent or the blade root window to blow air into the cavity.

[0008] In the above scheme, an air vent is additionally arranged on the blade body, so that the cavity of the blade body has two outlets. When the wind power blade is cured and formed, a blower is arranged at one of the outlets to blow air from one outlet to the other outlet, so that the hot air flow in the cavity is driven to flow and is blown away from the cavity for internal heat dissipation when the wind power blade is cured and formed. The outside of the blade body can be naturally cooled or air-cooled, so that uniform heat dissipation of the inside and outside of the blade body during the curing and forming of the wind power blade can be realized, and local deformation caused by uneven heat dissipation can be avoided. At the same time, since the structure of the wind power blade is mainly a skin girder structure, the skin is mainly used to provide an aerodynamic shape and bear most of the shear load, and the girder is a key component of the blade and mainly bears the load. The outer wall of the blade body does not serve as the main load-bearing component, so that the mechanical properties of the blade body are not excessively affected by the holes formed thereon.

[0009] Preferably, the air vent is in communication with one end of the cavity close to the blade tip of the blade body.

[0010] Preferably, an air extractor is arranged at the air vent or the blade root window to suck air into the cavity, and the air extractor and the blower are separately arranged at two ends of the cavity.

[0011] Preferably, the air extractor is arranged at the blade root window, and the blower is arranged at the air vent.

[0012] Preferably, a sealing baffle is connected at the blade root window, and an opening for connecting an air inlet of the air extractor is formed in the middle of the sealing baffle.

[0013] Preferably, a plurality of air vents are formed, and the air vents are uniformly and spacedly arranged along the length direction of the blade body, and one blower is arranged at each air vent.

[0014] Preferably, the air vent is formed on the leeward side of the blade body.

[0015] A wind power blade heat dissipation method, comprising the following steps:

[0016] S1, after the blade body is cured, the mold is opened, and a vent is formed on the side wall of the blade body;

[0017] S2, a blower is placed on the mold and the air outlet of the blower faces the vent or the blade root window;

[0018] S3, the blower is started to blow air into the cavity inside the blade body, and the air flow flows through the cavity along the length direction of the blade body and is blown out from the blade root window or the vent;

[0019] S4, when the blade temperature is less than or equal to 50℃, the blower is removed from the mold, and the blade body is demolded.

[0020] In the above scheme, the heat dissipation air flow is formed in the cavity by air cooling for heat dissipation, and the vent is formed to avoid the formation of positive pressure or negative pressure in the cavity to cause air flow accumulation. The outside cold air is introduced into the cavity and discharged along the cavity to quickly take away the heat in the cavity.

[0021] As a preferred, the blower is arranged at the vent in step S2, an air extractor is arranged at the blade root window, and the air flow is blown from one end of the cavity close to the blade tip to the blade root window along the length direction of the blade body in step S3.

[0022] As a preferred, after the demolding of the blade body is completed, the vent is filled and blocked with a material, and the material used for blocking is polished to smoothly transition with the outer wall of the blade body. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

[0024] Figure 2 is a blade root end surface schematic diagram of the present application;

[0025] Reference signs: 10, blade body; 11, blade root end; 12, blade root window; 13, vent; 20, blower; 30, air extractor; 40, sealing baffle; 41, opening. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0027] In the description of the present application, it should be noted that the terms "bottom", "outer side", "front and back", "up and down" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the use state, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0029] A wind power blade heat dissipation structure, comprising a blade body 10, a cavity is opened in the inside of the blade body 10, a blade root window 12 is opened in the blade root end 11 of the blade body 10 and communicates with the cavity, a ventilation port 13 is opened in the side wall of the blade body 10 and communicates with the outside and the cavity, and a blower 20 is arranged at the ventilation port 13 or the blade root window 12 to blow air into the cavity.

[0030] In the above-mentioned scheme, the ventilation port 13 is additionally arranged on the blade body 10, so that the cavity of the blade body has two outlets, the blower 20 is arranged at one of the outlets when the wind power blade is cured and formed, air flow can be blown from one outlet to the other outlet, so that the hot air flow in the cavity is driven to flow and is blown away when the wind power blade is cured and formed, internal heat dissipation is achieved, and the outside of the blade body 10 can be naturally cooled or air-cooled, so that uniform heat dissipation of the inside and outside of the blade body 10 during the curing and forming of the wind power blade is achieved, and local deformation caused by uneven heat dissipation is avoided. At the same time, the structure of the wind power blade is mainly a skin girder structure, in which the skin is mainly used to provide an aerodynamic shape and bear most of the shear load, and the girder is a key component of the blade and plays a main load bearing role, so the outer wall of the blade body 10 will not be the main load bearing component, and therefore the opening on the outer wall will not excessively affect the mechanical properties of the blade body 10.

[0031] Further, the ventilation port 13 communicates with one end of the cavity close to the blade tip of the blade body 10. In this way, the air flow can pass through the entire cavity, and the inside of the blade body 10 can be uniformly cooled.

[0032] Further, an air extractor 30 is arranged at the ventilation port 13 or the blade root window 12 to suck air into the cavity, and the air extractor 30 and the blower 20 are separately arranged at two ends of the cavity. That is, the air extractor 30 can be arranged at the ventilation port 13 or the blade root window 12, and the blower 20 is arranged at the other outlet, so that air is blown at one end and sucked at the other end, avoiding local wind pressure damage to the blade body 10 caused by blowing or sucking air.

[0033] Further, the air exhaust fan 30 is arranged at the blade root window 12, and the air blowing fan 20 is arranged at the air vent 13. The internal cavity of the blade body 10 is not uniformly shaped, and the end close to the blade root is larger. If air is blown from the blade root window 12, air flow will be accumulated at the end close to the blade tip. Since the blade body 10 is not completely cooled at this time, the blade body 10 close to the blade tip may be deformed.

[0034] Further, the blade root window 12 is connected with a sealing baffle 40, and an opening 41 for connecting the air inlet of the air exhaust fan 30 is arranged in the middle of the sealing baffle 40. Since the blade root window 12 is large and prone to air leakage, the blade root window 12 is sealed and connected with the opening 41 and the air exhaust fan 30 to prevent air leakage.

[0035] Further, the air vent 13 is arranged in plurality, and the air vents 13 are uniformly and spacedly arranged along the length direction of the blade body 10. The plurality of air vents 13 can improve the efficiency of air cooling and heat dissipation, and each air vent 13 is provided with one air blowing fan 20.

[0036] Further, the air vent 13 is arranged at the leeward side of the blade body 10. The air vent 13 prevents the fluid performance of the blade body 10.

[0037] A wind power blade cooling method, the method comprising the following steps:

[0038] S1, after the blade body 10 is cured, the mold is opened, and the air vent 13 is arranged on the side wall of the blade body 10;

[0039] S2, the air blowing fan 20 is arranged on the mold, and the air outlet of the air blowing fan 20 is directed to the air vent 13 or the blade root window 12;

[0040] S3, the air blowing fan 20 is started to blow air into the cavity of the blade body 10, and the air flow flows along the length direction of the blade body 10 and is blown out from the blade root window 12 or the air vent 13;

[0041] S4, when the blade temperature is less than or equal to 50℃, the air blowing fan 20 is removed from the mold, and then the blade body 10 is demolded.

[0042] In the above scheme, the air flow is formed in the cavity by air cooling to dissipate heat, and the air vent 13 is arranged to avoid the formation of positive pressure or negative pressure in the cavity to cause air flow accumulation. The external cold air is introduced into the cavity and discharged along the cavity to quickly take away the heat in the cavity.

[0043] Further, in step S2, the air blowing fan 20 is arranged at the air vent 13, the air exhaust fan 30 is arranged at the blade root window 12, and in step S3, the air flow is blown along the length direction of the blade body 10 from the end close to the blade tip of the cavity to the blade root window 12.

[0044] Further, after the blade body 10 is demolded, the air vent 13 is filled with material to seal it, and the material used for sealing is polished to smoothly transition with the outer wall of the blade body 10. This can maintain the original shape of the blade body 10 and prevent the air vent 13 from affecting the fluid performance of the blade body 10.

[0045] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. A heat dissipation method for a wind turbine blade heat dissipation structure, characterized in that: The method includes the following steps: S1. After the blade body (10) is cured, open the mold and open the air vent (13) on the side wall of the blade body (10); S2. Place the blower (20) at the vent (13) and the exhaust fan (30) at the blade root window (12); S3. Start the blower (20) to blow air into the cavity inside the blade body (10). The airflow blows from the end of the cavity near the blade tip to the blade root window (12) along the length of the blade body (10). S4. When the blade temperature is ≤50℃, remove the blower (20) from the mold and demold the blade body (10). After the blade body (10) is demolded, fill and seal the vent (13) with material and grind it to make the material used for sealing smooth transition with the outer wall of the blade body (10).

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