A flexible blade root baffle heating and forming device

Abstract

The present invention provides a flexible blade root baffle heating and forming device, which relates to the technical field of wind turbine blades. The device includes a gas supply device and at least two inflatable sleeves; the inflatable sleeves are cylinders connected end to end to form a ring sleeve, the inner cavity of the inflatable sleeve is a closed structure, and the barrel wall of the inflatable sleeve has elasticity; a support member is buried in the outer barrel wall of the inflatable sleeve located in the ring sleeve; the support member has rigidity in the radial direction of the barrel wall of the inflatable sleeve, so that the barrel wall of the inflatable sleeve wrapped with the support member is always straight in the cross section of the inflatable sleeve; an air inlet pipe is connected to the barrel wall of the inflatable sleeve where the support member is not provided, and a plurality of air outlet holes are formed in the barrel wall of the inflatable sleeve; the air outlet holes are all located on one side of the inflatable sleeve and are close to the barrel wall of the inflatable sleeve wrapped with the support member; the air outlet holes are evenly distributed along the circumferential direction of the ring sleeve. This device overcomes the defect of the existing blade root baffle heating and forming device that can only heat and cure from the outside of the blade root baffle, resulting in easy generation of internal stress in the connection area and reduction of the structural strength at the bonding part.

Description

Technical Field

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

[0002] During the operation of a wind turbine, if the items remaining in the blade fall and hit the hub, it will cause damage to the hub and then affect the normal operation of the wind turbine. To avoid the above problems, the existing wind turbine blades usually adopt the design of installing a root baffle at the root position to separate the blade cavity and the hub. Most of the connections between the root baffle and the blade body are bonded with fiberglass, that is, glass fiber reinforced plastic. In order to accelerate the curing of the liquid bonding material, a heating device is used during its forming. And in order for maintenance personnel to enter the blade cavity for maintenance operations, the root baffle not only needs to be provided with a manhole through which personnel can pass, but also needs to have a certain thickness to ensure that it will not be damaged or cracked when stepped on by personnel. However, the main bodies of the existing root baffle heating and forming devices are all rigid frame structures, so as to provide support for the heating components, enabling them to directly act on the annular connection part between the root baffle and the blade body. And this rigid frame structure is very difficult to pass through the manhole that only allows personnel to pass through. Therefore, the existing root baffle heating and forming devices can only heat from the outside of the root baffle. However, the root baffle has a certain thickness. The heat for heating takes not only a long time to pass through the thick root baffle, but also causes the bonding materials on the inner and outer sides to cure out of sync, and temperature gradients will appear on the inner and outer sides of the root baffle, resulting in different degrees of thermal expansion. In this way, after the bonding material cures and the root baffle cools, internal stress is likely to appear in the connection area, reducing the bonding structural strength of the root baffle. When the blade encounters strong wind or after long-term operation, cracking at the baffle connection is likely to occur, showing poor compressive strength and fatigue resistance, greatly reducing 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 existing root baffle heating and forming device, due to its rigid structure, can only heat and cure from the outside of the root baffle, resulting in easy generation of internal stress in the connection area and reduction of the structural strength at the bonding part.

[0004] To solve the above technical problems, the present application provides a flexible blade root baffle heating and forming device, which includes a gas supply device and at least two inflatable sleeves. The inflatable sleeve is a cylindrical body with its head and tail connected to form a ring sleeve. The inner cavity of the inflatable sleeve is a closed structure, and the wall of the inflatable sleeve has elasticity; a support member is embedded in the wall of the inflatable sleeve on the outer side of the ring sleeve; the support member has rigidity in the radial direction of the wall of the inflatable sleeve, so that the wall of the inflatable sleeve wrapped with the support member is always flat in the cross-section of the inflatable sleeve; the support member has flexibility and ductility in the circumferential direction of the ring sleeve; an air inlet pipe is connected to the wall of the inflatable sleeve where the support member is not provided, and the air inlet pipe is communicated with the gas supply device. A plurality of air outlet holes are formed in the wall of the inflatable sleeve; the air outlet holes are all located on one side of the inflatable sleeve and are close to the wall of the inflatable sleeve wrapped with the support member; the air outlet holes are evenly distributed along the circumferential direction of the ring sleeve; the amount of gas flowing into the inflatable sleeve from the air inlet pipe during pressurization is greater than the amount of gas discharged from the air outlet holes, so that the pressure in the inflatable sleeve increases and the ring sleeve generates radial expansion, and finally the wall of the inflatable sleeve wrapped with the support member is squeezed against the inner wall of the external blade body.

[0005] Further, a lining piece is embedded in the inner wall of the inflatable sleeve located on the inner side of the ring sleeve. The lining piece is connected head and tail around the circumferential direction of the ring sleeve. The lining piece includes a plurality of loop structures connected in parallel. The parallel direction of the loop structures is the same as the circumferential direction of the ring sleeve; the lining piece can be bent in the radial direction of the ring sleeve to form a tile-shaped bending state of the loop structure; when the loop structure is in the tile-shaped bending state, the inner holes of the loop structures can generate a closing trend, so that the inflatable sleeve generates a curvature that matches the inner wall of the external blade body in the circumferential direction of the ring sleeve; when the inner wall of the external blade body has an angle less than 90°, the loop structures located on both sides of the angle and in the tile-shaped bending state are pressed against each other, and then gradually flatten and move closer to the support member, and then the corresponding loop structures generate a turn in the circumferential direction of the ring sleeve, and finally the inflatable sleeve forms a turning shape that matches the angle.

[0006] Further, the loop structure is in a quasi-elliptical shape and has a loop minor axis and a loop major axis. The loop structure includes two parallel loop straight sections and loop bending sections respectively connecting the two ends of the loop straight sections. The loop straight sections are arranged along the loop minor axis direction, and two adjacent loop structures are connected in parallel through the same loop straight section.

[0007] Further, when observed from the cross-section of the inflatable sleeve, an interval area wall is provided between the adjacent ends of the wall of the inflatable sleeve where the support member and the lining piece are located; the air inlet pipe and the air outlet holes are provided on the interval area wall.

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

[0009] Further, a boss is continuously arranged on the inner cylindrical wall of the inflatable sleeve along the circumferential direction of the annular sleeve, and the boss is located on the side of the air outlet away from the support member.

[0010] Further, the air outlet pipe is a tubular solenoid valve, and the support member is an iron component.

[0011] Further, the air outlet pipe includes an iron core that can generate magnetism under electromagnetic action. One end of the iron core is adapted to perform the opening and closing action of the solenoid valve, and the other end of the iron core is a connecting seat adapted to be connected to the inflatable sleeve. The connecting seat is provided with a flange portion protruding from the outer surface of the inflatable sleeve; when the iron core has magnetism, the flange portion has an attracting tendency with the support member.

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

[0013] Further, when observed from the radial direction of the annular sleeve, the air outlet pipe is aligned with the outermost side end point of the support member bending section on the same side.

[0014] By adopting the above technical solutions, the present invention has the following technical effects:

[0015] 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 simultaneously by arranging an inflatable sleeve designed for the inner cavity of the blade. When facing a blade root baffle with a large thickness, it can greatly reduce the time-consuming for heating and temperature rising, and can improve the curing synchronization rate of the bonding materials on both sides of the bonding seam relative to the existing device, reducing the problems of increased internal stress and enlarged microscopic cracks caused by non-synchronous curing. At the same time, due to bilateral heating, the temperatures on both the inner and outer sides of the blade root baffle can be basically kept consistent, avoiding different degrees of thermal expansion caused by temperature gradients. After the blade root baffle cools, 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 wind or after long-term operation, enables the blade to obtain higher compressive strength and fatigue resistance as a whole, extends the service life of the blade and improves its working stability. In addition, because the device as a whole has great flexibility, it is easy to fold and store, only occupies a very small area in the factory building or warehouse, and has a light overall weight and is easy to handle. For the existing device with a rigid frame structure, as the root pitch circle of the current manufactured blade is getting larger and larger, its rigid frame has to gradually increase accordingly, which will greatly occupy the area of the operation and storage site, and the handling operation is also very inconvenient. Description of the Drawings

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Front structural schematic view of the inflatable sleeve of Embodiment 1 of the present invention;

[0018] Figure 2 For Figure 1 Cross-sectional view taken along line A-A in

[0019] Figure 3 For viewing from Figure 2 Structural schematic view of the support member observed from direction B in

[0020] Figure 4 Front structural schematic view of the inflatable sleeve of Embodiment 2 of the present invention;

[0021] Figure 5 For Figure 4 Cross-sectional view taken along line C-C in

[0022] Figure 6 Schematic perspective view of the structure of a partial section of Embodiment 2 of the present invention;

[0023] Figure 7 For viewing from Figure 5 Structural schematic view of the inner lining sheet observed from direction E in when it is in a flattened state;

[0024] Figure 8 For Figure 2 Partial enlarged cross-sectional view at D in

[0025] Figure 9 Schematic perspective view of the structure of the inner lining sheet in an angle-shaped bent state;

[0026] Figure 10 For Figure 7 Cross-sectional view taken along line F-F in

[0027] Figure 11 Exploded structural schematic view of the air outlet pipe with solenoid valve function of Embodiment 2 of the present invention;

[0028] Figure 12 Structural schematic cross-sectional view of the air outlet pipe with solenoid valve function of Embodiment 2 of the present invention.

[0029] Explanation of reference numerals:

[0030] 1 - Inflatable sleeve, 2 - Air outlet hole, 3 - Inlet pipe, 4 - Support member, 5 - Straight section of the support member, 6 - Bent section of the support member, 7 - Outlet pipe, 8 - Inlet joint, 9 - Wall of the spacer section, 10 - Lining piece, 11 - Boss, 12 - Short axis of the loop, 13 - Long axis of the loop, 14 - Straight section of the loop, 15 - Bent section of the loop, 16 - Loop structure, 17 - Connecting seat, 18 - Flange portion, 19 - Coil, 20 - Iron core, 21 - Valve body, 22 - Spring, 23 - Valve core, 24 - First connecting member, 25 - Second connecting member, 26 - Gasket. Detailed implementation mode

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that in the description of the present invention, the coordinate system used in the description of the orientation is determined by the orientation of the forward movement of the spiral pusher rod, and the viewing angle naming of the corresponding views is also based on this. Therefore, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 to the present invention.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Embodiment

[0035] 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 root baffle heating and forming device provided in this embodiment is mainly applicable to the scenario of the inner cavity of a blade with a complete circular cross-section, and it includes a gas supply device and at least two inflatable sleeves 1. Refer toFigure 1 and 2 As shown in Figure 2 or Figure 5 , the inflatable sleeve 1 of this embodiment is a cylindrical body with its head and tail connected to form a loop. The inner cavity of the inflatable sleeve 1 is a closed structure. The wall of the inflatable sleeve 1 is elastic and is generally made of rubber. However, since it mainly conveys hot air inside, it should be made of a rubber material with high temperature resistance. A support member 4 is embedded in the wall of the inflatable sleeve 1 on the outer side of the loop. The support member 4 has rigidity in the radial direction of the wall of the inflatable sleeve 1, so that the wall of the inflatable sleeve 1 wrapped with the support member 4 is always straight on the cross-section of the inflatable sleeve 1, that is, on the plane shown in Figure 2 or Figure 5 . Especially, it can still maintain a straight state after the inflatable sleeve 1 is inflated and pressurized. The support member 4 has flexibility and ductility in the circumferential direction of the loop. An air inlet pipe 3 is connected to the wall of the inflatable sleeve 1 where the support member 4 is not provided to prevent the air inlet pipe 3 from interfering with the fitting of the corresponding wall and the inner wall of the blade body. The air inlet pipe 3 is connected to a gas supply device. To facilitate the manufacture and connection of the air inlet pipe 3 and the inflatable sleeve 1, a first connecting member 24 with a joint function can be bonded after making a hole in the sleeve body of the inflatable sleeve 1. After setting a corresponding joint convenient for connecting with the first connecting member 24 at the head end of the air inlet pipe 3, the two can be conveniently connected through forms such as threaded connection. In addition, a plurality of air outlet holes 2 are also 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 are 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 circumferential direction of the loop.

[0036] Regarding the support member 4, in order to meet the above-mentioned related performance requirements, it can adopt a split structure or an integral structure. For example, it can adopt multiple bars arranged in parallel along the circumferential direction of the loop, so that it can have sufficient rigidity on the cross-section in the radial direction of the wall of the inflatable sleeve 1, that is, on the cross-section shown in Figure 2 . At the same time, it can also have flexibility and ductility in the circumferential direction of the loop through the elastic material of the wall between the bars. However, since the inflatable sleeve 1 made of rubber material usually adopts an extrusion process for manufacturing, setting split components inside it will cause a certain degree of conflict with the continuous extrusion process. Therefore, it is preferably to set the support member 4 as an integral structure. And for the integral structure of the support member 4 to meet the above performance requirements, an S-shaped, also known as a serpentine, structure can be adopted. In this way, relatively high rigidity can be formed in the radial direction of the wall of the inflatable sleeve 1, and very good flexibility and ductility can be formed in the circumferential direction of the loop. And to improve the material utilization rate, the support member 4 can adopt a slat and be bent from the thickness direction of the slat. In this way, in the direction of bearing the bending stress, the slat is in an upright state and can form a higher bending modulus. The specific structure of the support member 4 in this embodiment can refer to Figure 2 and 3 . Figure 2 and 3 ​​​​​​As shown, the support member 4 is a strip-shaped member bent into an S shape in the thickness direction. The support member 4 includes a support member bending section 6 and a plurality of support member straight sections 5. The support member straight sections 5 are parallel and arranged at intervals, and the support member bending section 6 is connected between the ends of adjacent support member straight sections 5.

[0037] When the device is in use, since the inflatable sleeve 1 is an elastic member and the support member 4 has flexibility in the circumferential direction of the ring sleeve, the inflatable sleeve 1 can be conveniently bent, so that it can pass through the manhole of the root baffle and then be sent into the inner cavity of the blade. Subsequently, air is sent into the inflatable sleeve 1 for pressurization. During the pressurization process of the inflatable sleeve 1, the amount of air flowing in from the intake pipe 3 is greater than the amount of air discharged from the air outlet holes 2. In this way, the pressure inside the inflatable sleeve 1 increases, and it is filled and expanded into a ring sleeve shape. When the inflatable sleeve 1 is filled, as the ring sleeve shape gradually forms, the operator needs to assist in arranging the inflatable sleeve 1 at the same time. Since the root baffle is in an upright state during installation, the support member 4 of the device can prevent the corresponding barrel wall from forming a round shape during inflation, facilitating the upright placement of the inflatable sleeve 1 that has generally formed a ring sleeve shape. And even after the full pressurization is completed, the pre-set contact plane will be wider than the contact surface formed after the round barrel wall expands, ensuring sufficient support effect. Next, when the inflatable sleeve 1 is inflated to form a ring sleeve shape, it should be stuck in an appropriate cross-section of the inner cavity of the blade, and the side provided with the air outlet holes 2 should face the root baffle. Subsequently, the inflatable sleeve 1 is continuously pressurized to achieve expansion and positioning. Since the inflatable sleeve 1 has elasticity and the support member 4 has corresponding ductility, overall, the ring sleeve shape of the inflatable sleeve 1 will generate radial expansion, and then the barrel wall of the inflatable sleeve 1 wrapped with the support member 4 will be squeezed against the wall surface of the inner cavity of the blade, thus playing a role in supporting and positioning. And because the air outlet holes 2 are provided on the wall surface of the side close to the support member 4, and the root baffle is generally of the same diameter as the inner cavity of the blade, that is, the connection seam between the root baffle and the inner cavity of the blade is the circumference of the inner cavity of the blade. Therefore, as the barrel wall of the inflatable sleeve 1 wrapped with the support member 4 expands and fits against the inner wall of the blade, the air outlet holes 2 will also move together, so that after positioning, they can be located very close to the connection seam of the root baffle, thus enabling hot air to be conveyed to the connection seam of the root baffle at a short distance and reducing unnecessary heat loss. And the above process cures the adhesive material from the inner side of the root baffle. Regarding heating the outer side of the root baffle, since the root baffle is not set at the very root of the blade, there will still be a section of the blade body outside the root baffle. Therefore, an inflatable sleeve 1 can be set on the outer side of the root baffle with reference to the operation on the inner side, so that heating of the inner and outer side surfaces of the root baffle can be achieved simultaneously. After the inflatable sleeve 1 is pressurized and expanded to achieve stable positioning, the input air volume of the inflatable sleeve 1 needs to be adjusted so that the input air volume is equal to the output air volume, thereby maintaining the internal pressure of the inflatable sleeve 1.

[0038] 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

[0039] 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.

[0040] 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.

[0041] 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 in it. Since this shape is similar to a tile from a three-dimensional perspective, 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. Because the straight section does not have the arched support structure of the arc section, the expansion support force will decrease. Enhancing the rigidity of the straight section helps the straight section to form a higher extrusion force on the inner cavity of the blade under the extrusion of the expansion force of the arc sections at both ends. In addition, the reason why the lining piece 10 adopts the structure of juxtaposed connection with the loop structure 16 instead of using a whole sheet of plate is that after the whole sheet of plate forms a tile-shaped bending, it will form a straight rigid body, which cannot be bent in the length direction to adapt to the arc-shaped inner wall of the blade cavity. The loop structure 16 has an inner hole. When the loop structure 16 is in the tile-shaped bending state, the inner hole of the loop structure 16 will produce a certain degree of closing trend on both sides of the hole because the corresponding entity is removed, so that the lining piece 10 adapts to the arc-shaped inner wall shape of the blade cavity, that is, the inflatable sleeve 1 generates a curvature that coincides with the inner wall of the blade body in the circumferential direction of the loop sleeve. In this way, not only can the inflatable sleeve 1 adapt to the curvature of the blade cavity, but also it can have a certain rigidity. Therefore, after making a sharp bend at the corner, it can maintain its original shape and avoid sudden collapse due to structural instability.

[0042] In addition, when there is a large corner in the inner wall of the blade cavity, such as the common structure of dividing into two chambers in the middle, the inflatable sleeve 1 will form Figure 4 the semi-circular shape shown, and its corner is 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 already produced a tile-shaped bending after inflation, the loop structures 16 in the tile-shaped bending state on both sides of the corner will be squeezed against each other, and their own tile-shaped forms will gradually be flattened. As the wall surface where the loop structure 16 is located is flattened, the lining piece 10 will also move closer to the wall surface where the support member 4 is located at the same time, converting the cross-section of the entire inflatable sleeve 1 into a flattened structure, making it easier to be bent. Eventually, a turn is formed in the circumferential direction of the corresponding loop structure 16 on the loop sleeve. In this turning shape, the lining pieces 10 that are flattened on both sides of the corner and intersect at an angle form a structure similar to an angle steel, that is, Figure 9 the angle-steel-shaped bending state shown. In this way, a very high rigidity is formed in the radial direction of the barrel wall of the inflatable sleeve 1, that is, in the tile-shaped bending direction of the loop structure 16, preventing the already flattened loop structure 16 from being arched and bulged again by the pressurized gas, thus ensuring that the inflatable sleeve 1 always has excellent turning performance at the turning point and avoiding the situation where the inflatable sleeve 1 makes a transition with a large fillet at the corner. As the inflatable sleeves 1 on both sides of the corner continue to be inflated and expanded, the corner of the lining piece 10 will move forward towards the corner of the inner wall of the blade cavity under the drive of the expansion air pressure on both sides, and finally the inflatable sleeve 1 forms a turning shape that conforms to the corresponding corner, that is,Figure 8 The turning form shown

[0043] Based on the above-described embodiments, in a preferred embodiment, as Figure 4 shown, a plurality of intake pipes 3 are provided on the inflatable sleeve 1 in the circumferential direction of the ring sleeve, and the intake pipes 3 converge at the intake joint 8 and are connected to the air supply device. Since the inflatable sleeve 1 is prone to form a dead bend at the corner, which greatly hinders the flow of the internal air flow on both sides of the corner, a plurality of intake pipes 3 are provided to supply air to different sections of the inflatable sleeve 1, which can avoid the problem that the air flow can only flow through the inflatable sleeve 1 and be blocked. In addition, the supply of air by a plurality of intake pipes 3 also helps the hot air to be sent to the required place along a shorter path, reducing heat loss.

[0044] Based on the above-described embodiments, in a preferred embodiment, as Figure 7 shown, the loop structure 16 is in a quasi-elliptical shape and has a loop minor axis 12 and a loop major axis 13. The loop structure 16 includes two mutually parallel loop straight sections 14 and loop bending sections 15 respectively connecting the two ends of the loop straight section 14. The loop straight sections 14 are arranged along the loop minor axis 12 direction, and adjacent two loop structures 16 are connected in parallel through the same loop straight section 14. After the angle steel-shaped bend shown in the inner lining piece 10 is formed, as the inflatable sleeve 1 continuously fits the inner cavity corner of the blade subsequently, the initially generated turning loop structure 16 is often not the loop structure 16 finally located at the turning point. Therefore, the turning of the loop structure 16 needs to be smoothly transmitted between different loop structures 16. And for the loop structure 16 set as above, because its loop bending section 15 forms a continuous m-shaped structure on the outer side edge of the inner lining piece 10, and each loop structure 16 is arranged along the loop minor axis 12 direction, this helps the already flattened loop structure 16 to pull the adjacent loop structure 16 that is still in a tile-shaped bend through this edge structure, so that the tile-shaped bent part of the inner lining piece 10 can be gradually flattened until an angle steel-shaped bend is formed, ensuring that the inner lining piece 10 can achieve a smooth state conversion and avoiding jamming when the corner is transmitted between different loop structures 16. Figure 9 shown, after the angle steel-shaped bend shown in the inner lining piece 10 is formed, as the inflatable sleeve 1 continuously fits the inner cavity corner of the blade subsequently, the initially generated turning loop structure 16 is often not the loop structure 16 finally located at the turning point. Therefore, the turning of the loop structure 16 needs to be smoothly transmitted between different loop structures 16. And for the loop structure 16 set as above, because its loop bending section 15 forms a continuous m-shaped structure on the outer side edge of the inner lining piece 10, and each loop structure 16 is arranged along the loop minor axis 12 direction, this helps the already flattened loop structure 16 to pull the adjacent loop structure 16 that is still in a tile-shaped bend through this edge structure, so that the tile-shaped bent part of the inner lining piece 10 can be gradually flattened until an angle steel-shaped bend is formed, ensuring that the inner lining piece 10 can achieve a smooth state conversion and avoiding jamming when the corner is transmitted between different loop structures 16.

[0045] Based on the above-described embodiments, in a preferred embodiment, as Figure 5 shown, when observed from the cross-section of the inflatable sleeve 1, a spacer cylinder wall 9 is provided between the adjacent ends of the support member 4 and the inner lining piece 10 on the cylinder wall of the inflatable sleeve 1; the intake pipe 3 and the air outlet hole 2 are provided on the spacer cylinder wall 9. The embedded parts provided on the cylinder wall of the inflatable sleeve 1 during extrusion molding may interfere with the opening of the ventilation structures such as the intake pipe 3 and the air outlet hole 2 in the later stage, and the provision of the spacer cylinder wall 9 can avoid the problem of encountering the obstruction of the embedded parts when opening the hole.

[0046] Based on the above-described embodiments, in a preferred embodiment, as Figure 5 and 8 shown, a rigid air outlet pipe 7 is provided at the air outlet 2. When observed from the cross-section of the inflatable sleeve 1, the air outlet pipe 7 inclines towards the side where the support member 4 is located in the natural state. Since the wall of the spacer section 9 will be extruded at the corner and presents the state as Figure 8 shown, the direction of the air outlet 2 here is changed, losing the orientation towards the connection seam of the blade root baffle. After setting the rigid air outlet pipe 7, even if affected by the wall of the spacer section 9, the air outlet passage will not change direction and will not be blocked by pressure. In addition, in order to better direct the output air flow towards the connection seam of the blade root baffle, the air outlet pipe 7 preferably inclines towards the side where the support member 4 is located, that is, towards the inner wall surface of the blade cavity, in the natural state. Thus, even if the air flow does not directly blow on the connection seam, it can be directed to the connection seam through the guidance of the inner wall surface of the blade cavity.

[0047] Based on the above-described embodiments, in a preferred embodiment, as Figure 5 and 10 shown, a convex platform 11 is continuously provided along the circumferential direction of the inner side wall of the inflatable sleeve 1. The convex platform 11 is 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 closely attached, thus blocking the intake end of the air outlet 2. After setting the above-mentioned convex platform 11, the wall surface where the lining piece 10 is located is blocked from being attached by the convex platform 11. Under the rigid support of the lining piece 10 that has already turned in an angle shape like an angle iron, appropriate gaps as Figure 10 shown will be left between the two side walls of the inflatable sleeve 1. Since the number of air outlets 2 at the corner is relatively small, sufficient air transmission passages can be left for the air outlets 2 in this way.

[0048] Based on the above-described embodiments, in a preferred embodiment, the air outlet pipe 7 is a tubular solenoid valve, and the support member 4 is an iron component. Such a setting has two functions. One is that the solenoid 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. The other is that in the working state, after the solenoid valve is energized and opened, it can have a certain magnetism. Since the air outlet pipe 7 is very close to the support member 4 and the support member 4 is made of iron, the air outlet pipe 7 can be deflected towards the side where the support member 4 is located by magnetic force, so as to correct the posture of the air outlet pipe 7 that is wrongly directed due to the fact that the elastomer cannot rebound in place after being oppressed in a non-natural state for a long time.

[0049] Based on the above-described embodiments, in a preferred embodiment, as Figure 11 and 12As shown, in order to achieve the solenoid valve function, the air outlet pipe 7 is provided with components such as a tubular valve body 21, a valve core 23, a spring 22, an iron core 20, a coil 19, and a gasket 26. After the iron core 20 is affected by the electromagnetic force of the coil 19, it can generate magnetism, 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, thus generating a retracting movement to open the valve, so that the air flow flows out from the central hole of the iron core 20, the side diversion holes 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 to perform the opening and closing action of the solenoid valve, and the other end of the iron core 20 is a connecting seat 17 adapted to be connected to the inflation sleeve 1. In order to facilitate the connection with the connecting seat 17, the inflation sleeve 1 can be drilled and bonded with a second connecting member 25 on the sleeve body, and the connecting seat 17 and the second connecting member 25 can be conveniently connected through forms such as threaded connection. In addition, the connecting seat 17 is provided with a flange portion 18 protruding from the outer surface of the inflation sleeve 1. When the iron core 20 has magnetism, the flange portion 18 will also have magnetism, so that the magnetic force lines scatter outward from the flange portion 18 located on the outer surface of the root of the air outlet pipe 7, thus generating an attracting tendency 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 very weak after reaching the support member 4 and it is difficult to cause the air outlet pipe 7 to swing. By setting the flange portion 18 protruding from the outer surface of the inflation sleeve 1 at a position relatively close to the support member 4, the air outlet pipe 7 can be effectively caused to act. 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.

[0050] Based on the above-described embodiment, in a preferred embodiment, when observed from the radial direction of the ring sleeve, the air outlet pipe 7 is aligned with the outermost end point of the support member bending section 6 on the same side. This embodiment is not directly shown in the drawings, but can be understood through Figure 3 . Referring to Figure 3 shown, assuming that the air outlet pipes 7 are all on the lower side of the support member 4, then each air outlet pipe 7 needs to be aligned with the support member bending section 6 located below, and the specific alignment point is the valley point of the support member bending section 6. Such a setting mainly utilizes the characteristic that there are no other support member bending sections 6 on the two adjacent sides of a certain support member bending section 6 of the S-shaped support member 4. 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 bending section 6 directly below it, and will not be attracted by other components on the side to cause unexpected deflection and inclination.

[0051] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill 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 enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present 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; 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.

2. The flexible blade root baffle heating and forming device according to claim 1, 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).

3. The flexible blade root baffle heating and forming device according to claim 1 or 2, 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).

4. The flexible blade root baffle heating and forming device according to claim 3, 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.

5. The flexible blade root baffle heating and forming device according to claim 4, 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).

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

7. The flexible blade root baffle heating and forming device according to claim 6, 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.

8. The flexible blade root baffle heating and forming device according to claim 7, 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).

9. The flexible blade root baffle heating and forming device according to claim 8, 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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