Flexible blade root baffle heating forming device

Abstract

The invention provides a flexible blade root baffle heating forming device, and relates to the technical field of wind power blades, the flexible blade root baffle heating forming device comprises an air supply device and at least two inflation sleeves; the inflation sleeve is a cylinder body which is connected end to end to form an annular sleeve, an inner cavity of the inflation sleeve is of a closed structure, and the cylinder wall of the inflation sleeve is elastic; a supporting piece is embedded in the cylinder wall, located on the outer side of the ring sleeve, of the inflation sleeve; the supporting piece has rigidity in the radial direction of the inflatable sleeve wall, so that the inflatable sleeve wall wrapped with the supporting piece is always in a straight shape on the cross section of the inflatable sleeve; an air inlet pipe is connected to the cylinder wall, not provided with the supporting piece, of the inflation sleeve, and a plurality of air outlet holes are formed in the cylinder wall of the inflation sleeve. The air outlet holes are all located in one side of the inflation sleeve and are close to the wall, wrapped with the supporting piece, of the inflation sleeve. The air outlet holes are evenly distributed in the circumferential direction of the ring sleeve. The device overcomes the defect that in the prior art, a blade root baffle thermoforming device can only conduct heating and curing from the outer side of a blade root baffle, so that internal stress is easily generated in a connecting area, and the structural strength of a bonding position is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a flexible blade root baffle heating and forming device. Background Art

[0002] During the operation of the wind turbine, if the objects remaining in the blades fall and hit the hub, it will cause damage to the hub and affect the normal operation of the wind turbine. In order to avoid the above problems, existing wind turbine blades usually adopt a design in which a blade root baffle is installed at the root position to separate the blade cavity and the hub. The connection between the blade root baffle and the blade body is mostly bonded with fiberglass, that is, glass fiber reinforced plastic. In order to accelerate the solidification of the liquid adhesive material, a heating device is used during its molding. In order to allow maintenance personnel to enter the blade cavity for maintenance work, the blade root baffle not only needs to have a manhole for personnel to pass through, but also needs to have a certain thickness to ensure that it will not be damaged or cracked when people step on it. However, the main body of the existing blade root baffle heating and forming devices is a rigid frame structure, which provides support for the heating component so that it can directly act on the annular connection between the blade root baffle and the blade body. However, it is difficult for such a rigid frame structure to pass through a manhole through which only personnel can pass. Therefore, the existing blade root baffle heating and forming devices can only heat from the outside of the blade root baffle. However, the blade root baffle has a certain thickness. It takes a long time for the heated heat to pass through the thick blade root baffle. It also causes the adhesive materials on the inside and outside to cure asynchronously, and causes a temperature gradient on the inside and outside of the blade root baffle, resulting in different degrees of thermal expansion. In this way, after the adhesive material cures and the blade root baffle cools, internal stress is easily generated in the connection area, reducing the strength of the bonding structure of the blade root baffle. When the blade encounters strong winds or after long-term operation, cracks are likely to occur at the baffle connection, showing poor compressive strength and fatigue resistance, which greatly reduces the service life and working stability of the blade. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the blade root baffle heating and forming device of the prior art can only be heated and cured from the outside of the blade root baffle due to its rigid structure, which makes it easy to generate internal stress in the connection area and reduce the structural strength of the bonding point.

[0004] In order to solve the above technical problems, the present application provides a flexible blade root baffle heating and forming device, including an air supply device and at least two inflatable sleeves. The inflatable sleeve is a cylinder connected end to end to form an annular sleeve, the inner cavity of the inflatable sleeve is a closed structure, and the cylinder wall of the inflatable sleeve is elastic; a support is buried in the cylinder wall of the inflatable sleeve located outside the annular sleeve; the support is rigid in the radial direction of the inflatable sleeve wall, so that the inflatable sleeve wall wrapped with the support is always straight in the cross section of the inflatable sleeve; the support is flexible and ductile in the circumferential direction of the annular sleeve; an air intake pipe is connected to the cylinder wall of the inflatable sleeve where the support is not provided, and the air intake pipe is connected to the air supply device. A plurality of air outlet holes are provided on the wall of the inflatable sleeve; the air outlet holes are all located on one side of the inflatable sleeve and close to the wall of the inflatable sleeve wrapped with the support member; the air outlet holes are evenly distributed along the circumference of the ring sleeve; during the pressurization process of the inflatable sleeve, the amount of air flowing into the inflatable sleeve from the air inlet pipe is greater than the amount of air discharged from the air outlet holes, so that the pressure in the inflatable sleeve increases and the ring sleeve expands radially, and finally the wall of the inflatable sleeve wrapped with the support member is squeezed tightly against the inner wall of the external blade body.

[0005] Furthermore, an inner lining is buried in the inner wall of the inflatable sleeve located in the annular sleeve, and the inner lining is connected end to end around the circumference of the annular sleeve, and the inner lining includes a plurality of loop structures connected in parallel, and the parallel direction of the loop structures is the same as the circumference of the annular sleeve; the inner lining can be bent in the radial direction of the annular sleeve, thereby forming a tile-like bending state of the loop structure; when the loop structure is in the tile-like bending state, the inner hole of the loop structure can produce a closing tendency, so that the inflatable sleeve produces a curvature in the circumferential direction of the annular sleeve that matches the inner wall of the external blade body; when the inner wall of the external blade body has a turning angle less than 90°, the loop structures in the tile-like bending state and located on both sides of the turning angle squeeze each other, and then gradually flatten and move closer to the support member, and then the corresponding loop structure turns in the circumferential direction of the annular sleeve, and finally the inflatable sleeve forms a turning shape that matches the turning angle.

[0006] Furthermore, the loop structure is elliptical in shape and has a loop short axis and a loop long axis. The loop structure includes two parallel loop straight sections and loop curved sections respectively connecting the two ends of the loop straight sections. The loop straight sections are arranged along the loop short axis direction, and two adjacent loop structures are connected in parallel through the same loop straight section.

[0007] Furthermore, when observed from the cross section of the inflatable sleeve, a spacer wall is provided between the adjacent ends of the support member and the inner lining sheet on the wall of the inflatable sleeve; and the air inlet pipe and the air outlet are provided on the spacer wall.

[0008] Furthermore, a rigid air outlet pipe is provided at the air outlet. When observed from the cross section of the inflatable sleeve, the air outlet pipe is inclined toward the side where the support member is located in a natural state.

[0009] Furthermore, bosses are continuously arranged on the inner wall of the inflatable sleeve along the circumference of the ring sleeve, and the bosses are located on the side of the air outlet away from the support member.

[0010] Furthermore, the air outlet pipe is a tubular electromagnetic valve, and the supporting member is an iron member.

[0011] Furthermore, the air outlet pipe includes an iron core that can generate magnetism under electromagnetic action, one end of the iron core is suitable for performing the opening and closing actions of the solenoid valve, and the other end of the iron core is a connecting seat suitable for connecting to the inflatable sleeve, and the connecting seat is provided with a flange portion protruding from the outer surface of the inflatable sleeve; when the iron core is magnetic, the flange portion and the support member have a tendency to attract each other.

[0012] Furthermore, the support member is a strip-shaped member bent into an S shape in the thickness direction, and includes a support member curved section and multiple support member straight sections, the support member straight sections are parallel and arranged at intervals, and the support member curved section is connected between the ends of adjacent support member straight sections.

[0013] Furthermore, when viewed from the radial direction of the ring sleeve, the air outlet pipe and the outermost end point of the curved section of the support member on the same side are aligned with each other.

[0014] By adopting the above technical solution, the present invention has the following technical effects: The flexible blade root baffle heating and forming device provided by the present invention can heat the inner and outer sides of the blade root baffle at the same time by setting an inflatable sleeve designed for the inner cavity of the blade, so that it can greatly reduce the time consumption of heating and heating, especially when facing a thick blade root baffle, and can improve the curing synchronization rate of the adhesive material on both sides of the bonding seam compared with the existing device, and reduce the problem of increasing and increasing internal stress and micro cracks caused by asynchronous curing. At the same time, because of the double-sided heating, the temperature on both sides of the blade root baffle can be basically kept consistent, avoiding the occurrence of temperature gradients and different degrees of thermal expansion. In this way, after the blade root baffle is cooled, the internal stress caused by different shrinkage rates can also be greatly reduced. In summary, the device improves the strength of the bonding structure of the blade root baffle, can reduce the problem of cracking at the baffle connection when the blade encounters strong winds or after long-term operation, so that the blade as a whole obtains higher compressive strength and fatigue resistance, prolongs the service life of the blade and improves its working stability. In addition, because the device as a whole is very flexible, it is easy to fold and store, only occupies a very small factory or warehouse area, and the overall weight is light and easy to carry. As the root pitch circle of the blades being manufactured becomes larger and larger, the rigid frame of the existing device with a rigid frame structure has to be gradually enlarged, which will greatly occupy the area of ​​the operation and storage site and make the handling operation very inconvenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic front view of the structure of the inflatable sleeve of Example 1 of the present invention; Figure 2 for Figure 1 Sectional view at AA in the middle; Figure 3 For Figure 2 A schematic diagram of the structure of the support member observed from the B direction; Figure 4 It is a schematic front view of the structure of the inflatable sleeve of Example 2 of the present invention; Figure 5 for Figure 4 Sectional view at CC; Figure 6 It is a schematic three-dimensional diagram of the structure of a part of the section of Example 2 of the present invention; Figure 7 For Figure 5 A schematic diagram of the structure of the inner lining sheet in a flattened state when viewed from the E direction; Figure 8 for Figure 2 A partial enlarged cross-sectional view at D in the middle; Fig. 9 It is a schematic three-dimensional diagram of the structure of the inner lining sheet in a state of being bent like an angle steel; Fig.10 for Figure 7 Cross-sectional view at FF; Fig.11 This is a schematic diagram of the structure explosion of the air outlet pipe with the solenoid valve function according to Embodiment 2 of the present invention; Fig.12 This is a schematic cross-sectional view of the structure of an air outlet pipe with a solenoid valve function according to Example 2 of the present invention.

[0017] Description of reference numerals: 1-inflatable sleeve, 2-air outlet, 3-inlet pipe, 4-support, 5-straight section of support, 6-bent section of support, 7-outlet pipe, 8-inlet joint, 9-wall of spacer, 10-inner lining, 11-boss, 12-short axis of loop, 13-long axis of loop, 14-straight section of loop, 15-bent section of loop, 16-loop structure, 17-connecting seat, 18-flange, 19-coil, 20-iron core, 21-valve body, 22-spring, 23-valve core, 24-first connecting member, 25-second connecting member, 26-gasket. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that in the description of the present invention, the coordinate system used in this specification when describing the orientation is determined by the orientation of the screw push rod performing the forward pushing motion, and the naming of the observation angles of the corresponding views is also based on this. Therefore, the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in this specification are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0022] The root of a wind turbine blade generally has a circular cross section, so its inner cavity generally also has a circular cross section. The flexible blade root baffle heating and forming device provided in this embodiment is mainly suitable for the scene of the blade inner cavity with a complete circular cross section, and includes an air supply device and at least two inflatable sleeves 1. Figure 1 and 2 As shown, the inflatable sleeve 1 of this embodiment is a cylinder connected end to end to form an annular sleeve. The inner cavity of the inflatable sleeve 1 is a closed structure. The cylinder wall of the inflatable sleeve 1 is elastic and can generally be made of rubber. However, because the interior mainly transports hot air, it should be made of high-temperature resistant rubber material. A support member 4 is embedded in the cylinder wall of the inflatable sleeve 1 located outside the annular sleeve. The support member 4 is rigid in the radial direction of the cylinder wall of the inflatable sleeve 1, so that the cylinder wall of the inflatable sleeve 1 wrapped with the support member 4 is in the cross section of the inflatable sleeve 1, that is, Figure 2 or Figure 5 The plane shown is always straight, especially after the inflatable sleeve 1 is inflated and pressurized, it can still remain straight. The support member 4 is flexible and ductile in the circumferential direction of the annulus. An air inlet pipe 3 is connected to the cylinder wall of the inflatable sleeve 1 where the support member 4 is not provided, so as to prevent the air inlet pipe 3 from interfering with the corresponding cylinder wall and the inner wall of the blade body. The air inlet pipe 3 is connected to the air supply device. In order to facilitate the manufacture and connection of the air inlet pipe 3 and the inflatable sleeve 1, a first connector 24 with a connector function can be bonded after a hole is punched on the sleeve body of the inflatable sleeve 1. After a corresponding connector conveniently connected to the first connector 24 is provided at the head end of the air inlet pipe 3, the two can be conveniently connected by threaded connection or the like. In addition, a plurality of air outlet holes 2 are also provided on the cylinder wall of the inflatable sleeve 1. The air outlet holes 2 are all located on one side of the inflatable sleeve 1 and close to the cylinder wall of the inflatable sleeve 1 wrapped with the support member 4. The air outlet holes 2 are evenly distributed along the circumference of the annulus.

[0023] As for the support member 4, in order to meet the above-mentioned relevant performance requirements, it can be a split structure or an integral structure. For example, it can be a plurality of rods arranged in parallel along the circumference of the ring sleeve, so that it can be radially arranged on the wall of the inflatable sleeve 1, that is, Figure 2 It has sufficient rigidity on the cross section shown, and at the same time, it can also be flexible and ductile in the circumferential direction of the annular sleeve through the elastic material of the tube wall between the rods. However, because the rubber inflatable sleeve 1 is usually manufactured by an extrusion process, the split components arranged inside it will conflict to a certain extent with the extrusion process of continuous production, so it is preferred to set the support member 4 as an integral structure. In order to meet the above-mentioned performance requirements, the support member 4 of the integral structure can adopt an S-shaped, also known as a serpentine structure, so that it can form a higher rigidity in the radial direction of the tube wall of the inflatable sleeve 1, and can form very good flexibility and ductility in the circumferential direction of the annular sleeve. In order to improve the utilization rate of materials, the support member 4 can be made of slats and bent in the thickness direction of the slats. In this way, in the direction of the bending stress, the slats are in an upright state, which can form a higher bending modulus. The specific structure of the support member 4 of this embodiment can be referred to. Figure 2 and 3As shown, the support member 4 is a strip-shaped component bent into an S shape in the thickness direction. The support member 4 includes a support member curved section 6 and multiple support member straight sections 5. The support member straight sections 5 are parallel and arranged at intervals. The support member curved section 6 is connected between the ends of adjacent support member straight sections 5.

[0024] When the device is in use, because the inflatable sleeve 1 is an elastic component and the support member 4 is flexible in the circumferential direction of the annular sleeve, the inflatable sleeve 1 can be conveniently bent so that it can pass through the manhole of the blade root baffle and then be sent into the inner cavity of the blade. Then, air is sent to the inflatable sleeve 1 for pressurization. During the pressurization process of the inflatable sleeve 1, the amount of air flowing into the inlet pipe 3 is greater than the amount of air discharged from the outlet hole 2, so that the pressure in the inflatable sleeve 1 increases, and then the inflatable sleeve 1 is filled and expanded into an annular shape. When the inflatable sleeve 1 is filled, as the annular shape is gradually formed, the operator needs to assist in placing the inflatable sleeve 1. Because the blade root baffle is in an upright state during installation, the support member 4 of the device can prevent the corresponding cylinder wall from forming a rounded shape during inflation, so that the inflatable sleeve 1 that has roughly formed an annular shape can be placed upright, and even after the full pressurization is completed, the contact plane set in advance will be wider than the contact surface formed by the cylinder wall in the rounded shape after expansion, ensuring sufficient support effect. Next, when the inflatable sleeve 1 is inflated to form a ring shape, it should be stuck in the appropriate cross-section of the blade cavity, and the side with the air outlet 2 should be facing the blade root baffle. Then the inflatable sleeve 1 is continuously pressurized to achieve expansion and positioning. Because the inflatable sleeve 1 is elastic and the support member 4 has corresponding ductility, the ring shape of the inflatable sleeve 1 will expand radially from the overall perspective, and then the wall of the inflatable sleeve 1 wrapped with the support member 4 is squeezed tightly with the wall surface of the blade cavity, thereby playing a supporting and positioning role. And because the air outlet 2 is set on the wall surface of the side close to the support member 4, and the blade root baffle is generally equal in diameter to the blade cavity, that is, the connection seam between the blade root baffle and the blade cavity is the circumference of the blade cavity, so as the wall of the inflatable sleeve 1 wrapped with the support member 4 expands and fits the inner wall of the blade, the air outlet 2 will also move with it, so that it can be located very close to the connection seam of the blade root baffle after positioning, so that hot air can be transported to the connection seam of the blade root baffle at a close distance, reducing unnecessary heat loss. And the above process solidifies the adhesive material from the inner side of the blade root baffle. As for heating on the outer side of the blade root baffle, because the blade root baffle is not set at the root of the blade, there will still be a section of the blade body on the outer side of the blade root baffle, so an inflatable sleeve 1 can be set on the outer side of the blade root baffle with reference to the operation on the inner side, so that the inner and outer sides of the blade root baffle can be heated simultaneously. After the inflatable sleeve 1 is pressurized and expanded to achieve stable positioning, the input gas volume of the inflatable sleeve 1 needs to be adjusted so that the input gas volume and the output gas volume remain equal, thereby maintaining the internal pressure of the inflatable sleeve 1.

[0025] The heating device heats the inner and outer sides of the blade root baffle at the same time, so that the time consumption of heating and temperature rise can be greatly reduced, especially when facing a thick blade root baffle, and the curing synchronization rate of the adhesive material on both sides of the bonding seam can be improved compared with the existing device, reducing the problem of increasing and increasing internal stress and micro cracks caused by asynchronous curing. At the same time, due to the double-sided heating, the temperature on the inner and outer sides of the blade root baffle can be basically kept consistent, avoiding the occurrence of temperature gradients and different degrees of thermal expansion. In this way, after the blade root baffle is cooled, the internal stress caused by different shrinkage rates can be greatly reduced. In summary, the device improves the strength of the bonding structure of the blade root baffle, can reduce the problem of cracking at the baffle connection when the blade encounters strong winds or after long-term operation, so that the blade as a whole has higher compressive strength and fatigue resistance, prolongs the service life of the blade and improves its working stability. In addition, because the device is very flexible as a whole, it is easy to fold and store, only occupies a very small factory or warehouse area, and the overall weight is light and easy to carry. As the root pitch circle of the blades being manufactured becomes larger and larger, the rigid frame of the existing device with a rigid frame structure has to be gradually enlarged, which will greatly occupy the area of ​​the operation and storage site and make the handling operation very inconvenient. Example

[0026] Because the interior of the wind turbine blade is not a completely hollow cavity, there are some reinforcing ribs inside, and sometimes the blade ribs extend to the installation position of the blade root baffle, so that the inner cavity of the blade is divided into two or more chambers. Therefore, in order to achieve heating from the inside of the blade root baffle, it is necessary not only to increase the number of inflatable sleeves 1, but also to adapt the inflatable sleeve 1 to the expansion support of non-circular cross-sections. The inflatable sleeve 1 of Example 1 can only turn with a small curvature during the inflation process, and when facing a large corner, it is difficult to spontaneously form a shape that fits the corner shape. Basically, it can only spontaneously transition with a large arc at the corner. Even if it is forced to bend into a dead bend during the layout stage, it is easy to suddenly lose the support force between the parts that were originally in a circular shape, resulting in the problem of lodging immediately after the bend.

[0027] The flexible blade root baffle heating and forming device provided in this embodiment provides an improved inflatable sleeve 1 for the above-mentioned application scenario. Figures 4 to 7 As shown, an inner lining sheet 10 is buried in the inner wall of the inflatable sleeve 1 located in the annular sleeve. The inner lining sheet 10 is connected end to end in the circumferential direction of the annular sleeve. The inner lining sheet 10 includes a plurality of loop structures 16 connected in parallel, and the parallel direction of the loop structures 16 is the same as the circumferential direction of the annular sleeve.

[0028] When the inflatable sleeve 1 starts to be inflated, the wall surface where the inner lining sheet 10 is located will be propped up and bulged, and the inner lining sheet 10 will bend in the radial direction of the ring sleeve, thereby forming a Figure 5 and 6The shape of the loop structure 16 is similar to a tile shape in three dimensions, so it is called the tile-shaped bending state of the loop structure 16. This tile-shaped bending can enhance the structural rigidity of the straight section of the inflatable sleeve 1. Since the straight section does not have the arched support structure of the arc section, the expansion support force will be reduced, and the rigidity of the straight section is enhanced, which helps the straight section to form a higher extrusion force on the inner cavity of the blade under the expansion force of the arc sections at both ends. In addition, the reason why the inner lining sheet 10 adopts the structure of parallel connection of the loop structure 16 instead of a whole plate is that after the whole plate forms a tile-like bend, it will form a straight rigid body, which cannot be bent in the length direction to adapt to the curved inner wall of the blade cavity, and the loop structure 16 has an inner hole. When the loop structure 16 is in the tile-like bending state, the inner hole of the loop structure 16 has a certain degree of closing tendency on both sides of the hole because the corresponding entity is removed, so that the inner lining sheet 10 adapts to the curved inner wall shape of the blade cavity, that is, the inflatable sleeve 1 produces a curvature in the circumferential direction of the ring sleeve that matches the inner wall of the blade body. In this way, not only can the inflatable sleeve 1 adapt to the curvature of the blade cavity, but also have a certain rigidity. Therefore, after a dead bend is formed at the corner, the original shape can be maintained, avoiding structural instability and sudden collapse.

[0029] In addition, when the inner wall of the blade chamber has a large angle, such as the common structure of two chambers in the middle, the inflatable sleeve 1 will form Figure 4 The semicircular shape shown has a turning angle of less than 90°. During inflation, the inflatable sleeves 1 on both sides of the corner will be squeezed against each other because they enter the corner. Since the loop structure 16 inside the inflatable sleeve 1 has been bent like a tile after inflation, the loop structures 16 on both sides of the corner that are in a tile-like bending state will be squeezed against each other, causing their own tile-like shape to be gradually pressed into a flattened state. As the wall surface where the loop structure 16 is located is flattened, the inner lining sheet 10 will also move closer to the wall surface where the support member 4 is located, so that the cross-section of the entire inflatable sleeve 1 is converted into a flattened structure, thereby making it easier to bend. Finally, the corresponding loop structure 16 forms a turning point in the circumferential direction of the ring sleeve. In this turning state, the inner lining sheets 10 on both sides of the corner that are flattened and intersecting at an angle form a structure similar to an angle steel, that is, Fig. 9 The angle steel-like bending state shown in the figure thus forms a high rigidity in the radial direction of the wall of the inflatable sleeve 1, that is, in the tile-like bending direction of the loop structure 16, and prevents the flattened loop structure 16 from being arched and bulged again by the pressurized gas, thereby ensuring that the inflatable sleeve 1 always has excellent steering performance at the turning point, and avoids the situation where the inflatable sleeve 1 transitions with a large rounded angle at the corner. As the inflatable sleeve 1 on both sides of the corner continues to be inflated and expanded, the corner of the inner lining sheet 10 will automatically move toward the corner of the inner wall of the blade chamber under the driving force of the expansion gas pressure on both sides, and finally the inflatable sleeve 1 forms a turning shape that matches the corresponding corner, that is, Figure 8 The turning pattern shown.

[0030] Based on the above implementation, in a preferred implementation, Figure 4 As shown, the inflatable sleeve 1 is provided with multiple air inlet pipes 3 in the circumferential direction of the ring sleeve, and each air inlet pipe 3 intersects at the air inlet joint 8 and is connected to the air supply device. Because the inflatable sleeve 1 is easy to complete a dead bend at the corner, which greatly hinders the flow of the internal airflow on both sides of the corner, multiple air inlet pipes 3 are provided to supply air to different sections of the inflatable sleeve 1, which can avoid the problem that the airflow can only flow from the inflatable sleeve 1 and is blocked. In addition, the air supply of multiple air inlet pipes 3 also helps to deliver the hot air to the required place in a shorter path, reducing heat loss.

[0031] Based on the above implementation, in a preferred implementation, Figure 7 As shown, the loop structure 16 is in an elliptical shape and has a loop short axis 12 and a loop long axis 13. The loop structure 16 includes two parallel loop straight sections 14 and loop curved sections 15 respectively connecting the two ends of the loop straight sections 14. The loop straight sections 14 are arranged along the loop short axis 12, and two adjacent loop structures 16 are connected in parallel through the same loop straight section 14. Fig. 9 After the angle steel-like bending shown, as the inflatable sleeve 1 continues to fit the blade inner cavity corner, the initial loop structure 16 that produces the turning is often not the loop structure 16 that is finally at the turning point. Therefore, the turning of the loop structure 16 needs to be smoothly transferred between different loop structures 16. The loop structure 16 set up above has a loop bending section 15 that forms a continuous M-shaped structure on the outer edge of the inner lining 10, and each loop structure 16 is arranged along the short axis 12 of the loop. This helps the flattened loop structure 16 to pull the adjacent loop structure 16 that still shows a tile-like bend through the edge structure, so that the tile-like bent part of the inner lining 10 can be gradually flattened until an angle steel-like bend is formed, ensuring that the inner lining 10 can achieve smooth state transition and avoid jamming when its corner is transferred between different loop structures 16.

[0032] Based on the above implementation, in a preferred implementation, Figure 5 As shown, from the cross section of the inflatable sleeve 1, the wall of the inflatable sleeve 1 is provided with a spacer wall 9 between the ends adjacent to the support member 4 and the inner lining sheet 10; the air inlet pipe 3 and the air outlet hole 2 are provided on the spacer wall 9. The embedded parts provided on the wall of the inflatable sleeve 1 during extrusion molding may hinder the opening of ventilation structures such as the air inlet pipe 3 and the air outlet hole 2 at a later stage, and the spacer wall 9 can avoid the problem of being blocked by the embedded parts when opening the hole.

[0033] Based on the above implementation, in a preferred implementation, Figure 5 and 8 As shown, a rigid air outlet pipe 7 is provided at the air outlet 2. When viewed from the cross section of the inflatable sleeve 1, the air outlet pipe 7 is naturally inclined toward the side where the support member 4 is located. Figure 8 In the state shown, the outlet hole 2 here is changed in direction and loses its orientation to the blade root baffle connection seam, and after the rigid outlet pipe 7 is provided, the outlet passage will not change direction or be blocked by pressure even if it is affected by the spacer wall 9. In addition, in order to better make the output airflow blow to the blade root baffle connection seam, the outlet pipe 7 is preferably inclined toward the side where the support member 4 is located, that is, toward the side of the blade inner cavity wall surface in the natural state, so that even if the airflow does not blow directly to the connection seam, it can be guided by the blade inner cavity wall surface to the connection seam.

[0034] Based on the above implementation, in a preferred implementation, Figure 5 and 10 As shown, bosses 11 are continuously provided on the inner wall of the inflatable sleeve 1 along the circumference of the annular sleeve, and the bosses 11 are located on the side of the air outlet 2 away from the support member 4. The inflatable sleeve 1 at the corner is prone to the situation where the two side walls are tightly fitted, thereby blocking the air inlet end of the air outlet 2. After the above-mentioned bosses 11 are provided, the wall where the inner lining sheet 10 is located is blocked by the bosses 11, and under the rigid support of the inner lining sheet 10 that has been turned into an angle steel shape, the two side walls of the inflatable sleeve 1 will leave a space as shown in FIG. Fig.10 The appropriate gap shown is because the number of the air outlet holes 2 at the corners is relatively small, so that sufficient air delivery paths can be reserved for the air outlet holes 2.

[0035] Based on the above embodiment, in a preferred embodiment, the air outlet pipe 7 is a tubular electromagnetic valve, and the support member 4 is an iron component. This arrangement has two functions. First, the electromagnetic valve can be closed when the inflatable sleeve 1 is in the inflated and pressurized state, so as to more quickly realize the inflation and shaping of the inflatable sleeve 1 and improve the deployment efficiency; second, in the working state, the electromagnetic valve can have a certain magnetism after being powered on and opened, and because the air outlet pipe 7 is very close to the support member 4, and the support member 4 is made of iron, the magnetic force can be used to make the air outlet pipe 7 swing toward the side where the support member 4 is located, thereby correcting the posture of the air outlet pipe 7 facing the wrong direction due to the elastic body being compressed in an unnatural state for a long time and not rebounding in place.

[0036] Based on the above implementation, in a preferred implementation, Fig.11 and 12As shown, in order to realize the electromagnetic valve function, the air outlet pipe 7 is provided with a tubular valve body 21, a valve core 23, a spring 22, an iron core 20, a coil 19 and a gasket 26. The iron core 20 can generate magnetism after being subjected to the electromagnetic action of the coil 19, and then attract the valve core 23 sliding in the valve cavity of the valve body 21 to overcome the thrust of the spring 22, thereby generating a retracting motion, opening the valve, and allowing the air flow to flow out from the central hole of the iron core 20, the side guide hole of the valve core 23, the valve cavity of the valve body 21 and the air outlet in sequence. Among them, one end of the iron core 20 is used to attract the valve core 23, thereby performing the opening and closing action of the electromagnetic valve, and the other end of the iron core 20 is a connecting seat 17 suitable for connecting with the inflatable sleeve 1. In order to facilitate the connection with the connecting seat 17, the inflatable sleeve 1 can be connected to the second connecting member 25 by drilling a hole in the sleeve body, and the connecting seat 17 and the second connecting member 25 can be conveniently connected by threaded connection or the like. In addition, the connection seat 17 is provided with a flange portion 18 protruding from the outer surface of the inflatable sleeve 1. When the iron core 20 is magnetic, the flange portion 18 will also be magnetic, so that the magnetic lines of force are scattered outward from the flange portion 18 located on the outer surface of the root of the outlet pipe 7, thereby generating a tendency of attraction with the nearby support member 4. Because the magnetic force decays rapidly with distance, the magnetic force at the valve action end of the iron core 20 is already very weak after reaching the support member 4, and it is difficult to cause the outlet pipe 7 to swing. However, by providing the flange portion 18 protruding from the outer surface of the inflatable sleeve 1 at a position close to the support member 4, the outlet pipe 7 can be effectively caused to move. In this way, one end of the iron core 20 is used for valve action, and the other end is used to attract the support member 4, giving full play to the magnetic force at both ends of the iron core 20.

[0037] Based on the above embodiment, in a preferred embodiment, when viewed from the radial direction of the ring sleeve, the air outlet pipe 7 is aligned with the outermost end of the support member curved section 6 on the same side. This embodiment is not directly shown in the form of a drawing, but can be seen through Figure 3 To understand. Figure 3 As shown, assuming that the air outlet pipes 7 are all located on one side below the support member 4, each air outlet pipe 7 needs to be aligned with the support member curved section 6 located below, and the specific alignment point is the valley point of the support member curved section 6. This arrangement mainly utilizes the characteristic of the S-shaped support member 4 that there are no other support member curved sections 6 on both sides of a certain support member curved section 6. In this way, when the support member 4 attracts the air outlet pipe 7, the air outlet pipe 7 will only be attracted by the support member curved section 6 directly below it, and will not be attracted by other components on the side to produce unexpected deflection and tilt.

[0038] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A flexible blade root baffle heating and forming device, characterized in that: The invention comprises an air supply device and at least two inflatable sleeves (1); the inflatable sleeve (1) is a cylinder connected end to end to form an annular sleeve, the inner cavity of the inflatable sleeve (1) is a closed structure, and the cylinder wall of the inflatable sleeve (1) is elastic; a support member (4) is embedded in the cylinder wall of the inflatable sleeve (1) located outside the annular sleeve; the support member (4) is rigid in the radial direction of the cylinder wall of the inflatable sleeve (1), so that the cylinder wall of the inflatable sleeve (1) wrapped with the support member (4) is always straight in the cross section of the inflatable sleeve (1); the support member (4) is flexible and ductile in the circumferential direction of the annular sleeve; on the cylinder wall of the inflatable sleeve (1) where the support member (4) is not provided, An air inlet pipe (3) connected to the air supply device is connected, and a plurality of air outlet holes (2) are opened on the wall of the inflatable sleeve (1); the air outlet holes (2) are all located on one side of the inflatable sleeve (1) and close to the wall of the inflatable sleeve (1) wrapped with the support member (4); the air outlet holes (2) are evenly distributed along the circumference of the annular sleeve; during the pressurization process of the inflatable sleeve (1), the amount of air flowing into the inflatable sleeve (1) from the air inlet pipe (3) is greater than the amount of air discharged from the air outlet holes (2), so that the pressure in the inflatable sleeve (1) increases and the annular sleeve expands radially, and finally the wall of the inflatable sleeve (1) wrapped with the support member (4) is squeezed tightly against the inner wall of the external blade body.

2. The flexible blade root baffle heating and forming device according to claim 1, characterized in that: An inner lining sheet (10) is embedded in the inner wall of the inflation sleeve (1) located on the inner side of the annular sleeve. The inner lining sheet (10) surrounds the annular sleeve and is connected end to end in the circumferential direction. The inner lining sheet (10) includes a plurality of loop structures (16) connected in parallel. The parallel direction of the loop structures (16) is the same as the circumferential direction of the annular sleeve. The inner lining sheet (10) can be bent in the radial direction of the annular sleeve, thereby forming a tile-like bending state of the loop structures (16). When the loop structures (16) are in the tile-like bending state, the inner hole of the loop structures (16) A closing tendency can be generated, so that the inflatable sleeve (1) generates a curvature in the circumferential direction of the annular sleeve that matches the inner wall of the outer blade body; when the inner wall of the outer blade body has a turning angle less than 90°, the loop structures (16) in the tile-like bending state and located on both sides of the turning angle squeeze each other, and then gradually flatten and move closer to the support member (4), and then the corresponding loop structures (16) generate a turning in the circumferential direction of the annular sleeve, and finally the inflatable sleeve (1) forms a turning shape that matches the turning angle.

3. The flexible blade root baffle heating and forming device according to claim 2, characterized in that: The loop structure (16) is elliptical in shape and has a loop short axis (12) and a loop long axis (13). The loop structure (16) comprises two mutually parallel loop straight sections (14) and loop curved sections (15) respectively connected to the two ends of the loop straight sections (14). The loop straight sections (14) are arranged along the direction of the loop short axis (12), and two adjacent loop structures (16) are connected in parallel via the same loop straight section (14).

4. The flexible blade root baffle heating and forming device according to any one of claims 1 to 3, characterized in that: Observing from the cross section of the inflatable sleeve (1), the cylinder wall of the inflatable sleeve (1) is provided with a spacer cylinder wall (9) between the adjacent ends of the support member (4) and the inner lining sheet (10); the air inlet pipe (3) and the air outlet hole (2) are provided on the spacer cylinder wall (9).

5. The flexible blade root baffle heating and forming device according to claim 4, characterized in that: A rigid air outlet pipe (7) is provided at the air outlet hole (2); when viewed from the cross section of the inflatable sleeve (1), the air outlet pipe (7) is inclined towards the side where the support member (4) is located in a natural state.

6. The flexible blade root baffle heating and forming device according to claim 5, characterized in that: A boss (11) is continuously provided on the inner wall of the inflation sleeve (1) along the circumference of the ring sleeve, and the boss (11) is located on a side of the air outlet (2) away from the support member (4).

7. The flexible blade root baffle heating and forming device according to claim 5, characterized in that: The air outlet pipe (7) is a tubular electromagnetic valve, and the support member (4) is an iron member.

8. The flexible blade root baffle heating and forming device according to claim 7, characterized in that: The air outlet pipe (7) comprises an iron core (20) which can generate magnetism under electromagnetic action, one end of the iron core (20) is suitable for performing the opening and closing action of the electromagnetic valve, and the other end of the iron core (20) is a connecting seat (17) suitable for connecting to the inflatable sleeve (1), and the connecting seat (17) is provided with a flange portion (18) protruding from the outer surface of the inflatable sleeve (1); when the iron core (20) is magnetic, the flange portion (18) and the support member (4) have a tendency to attract each other.

9. The flexible blade root baffle heating and forming device according to claim 8, characterized in that: The support member (4) is a strip-shaped member bent into an S-shape in the thickness direction. The support member (4) comprises a support member bent section (6) and a plurality of support member straight sections (5). The support member straight sections (5) are parallel and arranged at intervals. The support member bent sections (6) are connected between the ends of adjacent support member straight sections (5).

10. The flexible blade root baffle heating and forming device according to claim 9, characterized in that: When viewed from the radial direction of the ring sleeve, the air outlet pipe (7) is aligned with the outermost end point of the support member bent section (6) on the same side.

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