A tandem dual-rotor wind turbine and its main frame

Abstract

The present invention provides a tandem dual-rotor wind turbine and its main frame. The length of the front frame is less than that of the rear frame. The rear end of the front frame is butt-jointed and fixed to the front end of the rear frame. The panels of the front frame and the rear frame are located on the same horizontal plane to form an installation surface. The lower ends of the trusses are respectively installed and fixed to the panels of the front frame and the rear frame through connection nodes. By arranging the trusses to connect and fix the front frame and the rear frame horizontally and from above, it is not only possible to set the structures corresponding to the tandem dual-rotor wind turbine separately, but also due to the structural characteristics of forming in parts and assembling, the overall coordination can be achieved by first hoisting and then assembling. While ensuring the stiffness and strength, the weight of the frame can also be reduced to meet the operation and assembly requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power equipment, and particularly to a tandem dual-rotor wind turbine and its main frame. Background Art

[0002] With the development of the wind power industry, high-power wind turbines with high towers and long blades have become the mainstream of the industry. Limited by key materials and technologies, the large-scale development of the above-mentioned wind turbines will be severely restricted. In contrast, due to the design of its dual rotors, the tandem dual-rotor wind turbine can achieve cascade utilization of wind energy in practical applications, that is, the same wind power can be utilized for power generation multiple times. Compared with the linear growth of the blade length of traditional single-rotor wind turbines with the increase of the unit capacity, under the premise of the same power generation, the tandem dual-rotor wind turbine does not require a long blade length. On the one hand, it can reduce the cost of the wind turbine, and on the other hand, it can avoid occupying a large amount of space and site, and has received more attention in the wind turbine market.

[0003] To improve the wind energy capture efficiency of the tandem dual-rotor wind turbine, the two impellers need to be able to operate independently, which requires two sets of power generation equipment for the device, and the two impellers need to operate independently, making the span of the main drive system longer and the structure more complex. To meet the assembly and support requirements of the main drive system, yaw bearing, yaw drive, etc., the main frame is longer than that of the traditional single-rotor wind turbine main frame. And due to the environment where the wind turbine is located and the power generation requirements of the equipment, to ensure the safe and stable operation of the unit, the main frame needs to have sufficient stiffness and strength.

[0004] The main frame of the existing single-rotor wind turbine adopts a form of front casting and rear welding. The cast front frame bears most of the loads of the unit, and the welded rear frame supports components such as generators and electrical cabinets. The overall length of the main frame is relatively short and cannot be applied to the tandem dual-rotor wind turbine. If simply borrowing the structure form of the traditional single-rotor wind turbine main frame and increasing the overall length and thickness of the frame to meet the requirements of the dual-rotor unit for the stiffness and strength of the main frame, it will cause a sharp increase in the weight and manufacturing cost of the main frame, thus making the dual-rotor unit lose its economic efficiency. Therefore, the main frame structure in the prior art cannot meet the assembly and support requirements of the main drive system, yaw bearing, yaw drive, etc. of the tandem dual-rotor wind turbine, and has sufficient stiffness and strength under the condition of appropriate weight to ensure the safe and stable operation of the unit. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides a tandem dual-rotor wind turbine and its main frame, which are reasonably combined and ingeniously designed, and can meet the installation requirements of the tandem dual-rotor wind turbine while ensuring sufficient stiffness, strength and a relatively light frame weight.

[0006] The present invention is realized through the following technical solutions:

[0007] The present invention provides a main frame for a tandem dual-rotor wind turbine, including a front frame, a rear frame, and a truss;

[0008] The length of the front frame is less than that of the rear frame; the rear end of the front frame and the front end of the rear frame are butt-jointed and fixed, and the panels of the front frame and the rear frame are located on the same horizontal plane to form an installation surface;

[0009] The lower end of the truss is respectively fixedly installed on the panels of the front frame and the rear frame through connection nodes.

[0010] Preferably, a first connection structure is prominently provided in the middle of the rear end of the front frame, and second connection structures extend forward on both sides of the front end of the rear frame. The first connection structure is inserted and fixedly connected to the second connection structure.

[0011] Preferably, the truss includes a front large truss and a rear small truss. The bottom of the front large truss is fixedly connected to the middle section of the front frame panel and the front section of the rear frame panel through corresponding connection nodes respectively. The bottom of the rear small truss is fixedly connected to the middle section of the rear frame panel through a corresponding connection node; the connection and fixation position at the top of the front large truss and the rear small truss is located above the rear frame.

[0012] Preferably, a front leg connected to the front end of the front frame is inclinedly provided at the front end of the front large truss; a rear leg connected to the rear end of the rear frame is inclinedly provided at the rear end of the rear small truss.

[0013] Preferably, the front large truss and the rear small truss are respectively formed by welding an upper chord, columns, and diagonal braces;

[0014] Front cross beams, middle cross beams, and rear cross beams are sequentially arranged from front to back between the upper chords of the front large truss. Diagonal cross beams are arranged diagonally between the front cross beam and the middle cross beam. Upper chord longitudinal and transverse beams are arranged parallel to the upper chords between the middle cross beam and the rear cross beam.

[0015] Preferably, the front frame is used for installing the front drive chain of a tandem dual-rotor wind turbine and includes a front frame bottom plate and a front frame panel;

[0016] Both sides of the surface of the front frame bottom plate are respectively fixedly connected to the corresponding front frame panels through symmetrically arranged front frame side longitudinal webs; on the front frame panel, a front drive chain front bearing seat connecting plate, a front drive chain rear bearing seat connecting plate, and a front drive chain gearbox elastic support connecting plate corresponding to the front drive chain structure are sequentially arranged from front to back, as well as a front frame lifting lug for lifting the frame.

[0017] Preferably, a plurality of transverse webs are provided on the front frame bottom plate, corresponding to the positions on the front side of the front frame lifting lugs, as well as the positions of the front bearing seat connecting plates of the front drive chain and the rear bearing seat connecting plates of the front drive chain. An intermediate longitudinal web of the front frame is fixed on the front frame bottom plate between the transverse webs, and reinforcing ribs of the front frame bottom plate are provided on the front frame bottom plate.

[0018] Outside ribs of the front frame are provided on the outer sides of the corresponding transverse webs of the longitudinal webs on the side of the front frame, and inner ribs of the front frame are arranged at the load-bearing positions between the front frame bottom plate and the front frame panel.

[0019] Preferably, the rear frame is used for installing the rear drive chain and the yaw system of a tandem dual-rotor wind turbine, and includes a rear frame bottom plate and a rear frame panel.

[0020] Both sides of the surface of the rear frame bottom plate are fixedly connected to the rear frame panel respectively through symmetrically arranged longitudinal webs on the side of the rear frame. The longitudinal webs on the side of the rear frame include intermediate longitudinal webs on the side and rear longitudinal webs on the side arranged in sequence along the longitudinal direction. On the rear frame panel, from back to front, connecting plates of the front bearing seat of the rear drive chain, connecting plates of the rear bearing seat of the rear drive chain, elastic support connecting plates of the rear drive chain gearbox, elastic support connecting plates behind the generator, and elastic support connecting plates in front of the generator corresponding to the structures of the rear drive chain and the yaw system are arranged in sequence.

[0021] Rear frame lifting lugs for lifting the frame are provided on the front side of the rear frame panel corresponding to the elastic support connecting plates of the rear drive chain gearbox.

[0022] Preferably, an X-shaped bracket is correspondingly arranged in the middle of the rear frame panel and the generator.

[0023] Yaw drive connection bolt holes, yaw bearing connection bolt holes, and yaw caliper connection bolt holes corresponding to the yaw system are provided in the middle of the rear frame bottom plate. An intermediate transverse web is provided in the middle of the rear frame bottom plate, and a curved web is provided for supporting corresponding to the X-shaped bracket.

[0024] A plurality of rear transverse webs are arranged at intervals in the rear part of the rear frame bottom plate. An intermediate longitudinal web of the rear frame is fixed on the rear frame bottom plate between the rear transverse webs. Reinforcing ribs of the rear frame bottom plate are provided on the rear frame bottom plate.

[0025] Outside ribs of the rear frame are provided on the outer sides of the corresponding rear transverse webs of the rear longitudinal webs on the side, and inner ribs of the rear frame are arranged at the load-bearing positions between the rear frame bottom plate and the rear frame panel.

[0026] The present invention also proposes a tandem dual-rotor wind turbine, adopting the main frame described above. The front frame installs the front drive chain of the tandem dual-rotor wind turbine; the rear frame installs the rear drive chain and the yaw system of the tandem dual-rotor wind turbine.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] In the present invention, the truss is arranged to connect and strengthen the front frame and the rear frame horizontally and from above at the same time. It can not only be respectively arranged corresponding to the structure of the tandem dual-rotor wind turbine, but also due to the structural characteristics of split forming and assembly, the overall cooperation can be realized by first hoisting and then assembling. While ensuring the stiffness and strength, the weight of the frame can also be reduced to meet the operation and assembly requirements.

[0029] Furthermore, the truss is split into a large front part and a small rear part. At the same time, the front large truss integrally connects the front frame and the rear frame, ensuring the integrity and rigid strength requirements of the connection of the three. Then, the rear small truss ensures the overall strength and structural matching of the truss; and a cross beam is arranged on the key front large truss for strengthening, and only a basic structure is adopted for the rear small truss, greatly reducing the weight of the frame.

[0030] Furthermore, the front and rear frames respectively realize the frame structure of the frame through the corresponding settings of the panel, the bottom plate, and the side web, greatly reducing the weight. Through the arranged reinforcing ribs, rib plates, and vertical and horizontal webs, the overall structure is strengthened to meet the positioning and strength requirements of support and connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the main frame described in the embodiment of the present invention.

[0032] Figure 2 It is Figure 1 A partial enlarged view of the connection structure between the main frame and the truss at position A in

[0033] Figure 3 It is Figure 1 A partial enlarged view of the connection structure between the front and rear frames at position B in

[0034] Figure 4 It is a schematic diagram of the overall structure of the front frame described in the embodiment of the present invention.

[0035] Figure 5 It is Figure 4 A longitudinal sectional schematic diagram of

[0036] Figure 6 It is a schematic diagram of the overall structure of the rear frame described in the embodiment of the present invention.

[0037] Figure 7 It is Figure 6 A top view of

[0038] Figure 8 It is Figure 7Schematic longitudinal cross-section diagram in the C-C direction.

[0039] Figure 9 This is the overall structure schematic diagram of the truss described in the embodiment of the present invention.

[0040] Figure 10 is Figure 9 Partial enlarged view of the connection structure between the front large truss and the rear small truss at position D in

[0041] In the figure: front frame 1, rear frame 2, truss 3;

[0042] Front frame bottom plate 101, front frame side longitudinal web 102, front frame outer rib plate 103, connecting side cushion plate 104 between the front and rear frames, front frame panel 105, connecting plate 106 of the front bearing seat of the front drive chain, connecting plate 107 of the rear bearing seat of the front drive chain, connecting plate 108 of the elastic support of the front drive chain gearbox, front frame lifting lug 109, connecting plate 110 of the front leg of the front large truss, connecting plate 111 of the first intermediate leg of the front large truss, connecting plate 112 of the second intermediate leg of the front large truss, upper cushion plate 113 for connecting the front and rear frames, transverse web 114, front frame intermediate longitudinal web 115, reinforcing rib 116 of the front frame bottom plate, inner rib plate 117 of the front frame;

[0043] Rear frame bottom plate 201, intermediate side longitudinal web 202, rear side longitudinal web 203, rear frame outer rib plate 204, connecting side cushion plate 205 between the front and rear frames, rear frame panel 206, connecting plate 207 of the front bearing seat of the rear drive chain, connecting plate 208 of the rear bearing seat of the rear drive chain, connecting plate 209 of the elastic support of the rear drive chain gearbox, rear frame lifting lug 210, connecting plate 211 of the rear elastic support of the generator, connecting plate 212 of the front elastic support of the generator, connecting plate 213 of the rear leg of the rear small truss, connecting plate 214 of the intermediate leg of the rear small truss, connecting plate 215 of the front leg of the rear small truss, connecting plate 216 of the rear leg of the front large truss, upper cushion plate 217 for connecting the front and rear frames, bolt hole 218 for connecting the yaw drive, bolt hole 219 for connecting the yaw bearing, bolt hole 220 for connecting the yaw caliper, rear side transverse web 221, reinforcing rib 222 of the rear frame bottom plate, rear frame intermediate longitudinal web 223, inner rib plate 224 of the rear frame, intermediate transverse web 225, curved web 226;

[0044] Front leg 301, front large truss 302, rear small truss 303, rear leg 304, connection structure 305 between the front leg and the front large truss, connection structure 306 between the front large truss and the rear small truss, connection structure 307 between the rear small truss and the rear leg, front cross beam 308, middle cross beam 309, rear cross beam 310, inclined cross beam 311, upper chord longitudinal and transverse beams 312, cross beam connection structure 313, connecting plate 314. Detailed implementation manner

[0045] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0046] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0047] For the sake of convenience in description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between one device or feature and other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures for the device. For example, if the device in the attached drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned or rotated in other different ways, such as by 90 degrees or in other orientations, and corresponding interpretations should be made for the spatial relative descriptions used here.

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0049] The main frame of a tandem dual - wind - wheel wind turbine of the present invention, as Figure 1 shown, includes a front frame 1, a rear frame 2 and a truss 3; the length of the front frame 1 is less than that of the rear frame 2; as Figure 1 and Figure 3 shown, the rear end of the front frame 1 and the front end of the rear frame 2 are butt - jointed and fixed, and the panels of the front frame 1 and the rear frame 2 are located on the same horizontal plane to form an installation surface; as Figure 1 and Figure 2 shown, the lower end of the truss 3 is respectively installed and fixed to the panels of the front frame 1 and the rear frame 2 through connection nodes.

[0050] Among them, the connection nodes, as Figure 2As shown in the figure, it includes a frame connection plate 111 arranged at the corresponding connection position of the panel, a truss connection structure bottom plate 315 arranged at the bottom connection position of the truss, and truss connection structure side plates 316 and a truss connection structure middle plate 317 for connecting the main truss structure and the truss connection structure bottom plate 315. The truss connection structure side plates 316 are symmetrically arranged on the truss connection structure bottom plate 315 with the truss connection structure middle plate 317 as the symmetry plane. The frame connection plate 111 and the truss connection structure bottom plate 315 are correspondingly arranged and are correspondingly provided with bolt holes, and the two structures are connected by bolts.

[0051] In the present invention, the truss 3 is as Figure 1 and Figure 9 shown in the figure, and includes a front large truss 302 and a rear small truss 303. The bottom of the front large truss 302 is fixedly connected to the middle section of the panel of the front frame 1 and the front section of the panel of the rear frame 2 through corresponding connection nodes respectively. The bottom of the rear small truss 303 is fixedly connected to the middle section of the panel of the rear frame 2 through corresponding connection nodes. The top connection and fixation position of the front large truss 302 and the rear small truss 303 is above the rear frame 2.

[0052] The front large truss 302 and the rear small truss 303 are respectively formed by welding the upper chord, columns and diagonal braces; as Figure 9 shown in the figure, the structures on both sides of the front large truss 302 are symmetric. One side of the structure is provided with a complete upper chord, and three columns and corresponding three diagonal braces are respectively arranged at the lower part. One column and one diagonal brace form a triangular structure with the upper chord, and the vertices formed at the bottom are connected to the corresponding connection nodes for connection and fixation with the panel. The diagonal braces of the front large truss 302 are inclined forward, and the rear end of the upper chord extends to form a connection end of the front large truss 302.

[0053] As Figure 1 and Figure 9 shown in the figure, front cross beams 308, middle cross beams 309 and rear cross beams 310 are sequentially arranged from front to back between the upper chords of the front large truss 302. The three cross beams correspond to the positions of the above three columns respectively. Diagonal cross beams 311 are arranged diagonally between the front cross beam 308 and the middle cross beam 309, and upper chord longitudinal and transverse beams 312 are arranged parallel to the upper chord between the middle cross beam 309 and the rear cross beam 310. The cross beams and the upper chords are connected and fixed through a cross beam connection structure 313. The cross beam connection structure 313 includes a pair of arranged connection end plates, which are arranged face to face and are fixedly connected by bolts.

[0054] The structures on both sides of the rear small truss 303 are symmetrical. One side of the structure is provided with a complete upper chord, and two columns and corresponding two diagonal braces are respectively arranged at the lower part. One column and one diagonal brace form a triangular structure with the upper chord, and the vertices formed at the bottom are connected to the corresponding connection nodes for connecting and fixing with the panel. The diagonal braces of the rear small truss 303 are inclined backward, and the front end of the upper chord extends to form the connection end of the rear small truss 303. No cross beam is arranged between the upper chords of the rear small truss 303.

[0055] The connection end of the front large truss 302 and the connection end of the rear small truss 303 are connected and fixed through the connection structure 306 between the front large truss and the rear small truss. The connection structure 306 between the front large truss and the rear small truss includes connecting plates 314 that are connected and fixed by bolts and arranged on the four side faces of the connection part, namely the upper, lower, left, and right sides.

[0056] As Figure 1 and Figure 9 shown, the front end of the front large truss 302 is inclined with a front leg 301 connected to the front end of the front frame 1; the front leg 301 is inclined forward, and the end is provided with a connection node for connecting and fixing with the front frame 1. The rear end of the rear small truss 303 is inclined with a rear leg 304 connected to the rear end of the rear frame 2. The rear leg 304 is inclined backward, and the end is provided with a connection node for connecting and fixing with the rear frame 2.

[0057] The connection end of the front leg 301 and the front connection end of the front large truss 302 are connected and fixed through the connection structure 305 between the front leg and the front large truss. The connection structure 305 between the front leg and the front large truss includes connecting plates 314 that are connected and fixed by bolts and arranged on the four side faces of the connection part, namely the upper, lower, left, and right sides.

[0058] In the present invention, as Figure 4 and Figure 5 shown, the front frame 1 is used for installing the front drive chain of the tandem dual-rotor wind turbine, and includes a front frame bottom plate 101 and a front frame panel 105;

[0059] Both sides of the surface of the front frame bottom plate 101 are respectively fixedly connected to the corresponding front frame panels 105 through symmetrically arranged front frame side longitudinal webs 102; on the front frame panel 105, from front to back, there are successively arranged a front drive chain front bearing seat connecting plate 106, a front drive chain rear bearing seat connecting plate 107, and a front drive chain gearbox elastic support connecting plate 108 corresponding to the front drive chain structure, as well as a front frame lifting lug 109 for lifting the frame. Among them, the front drive chain gearbox elastic support connecting plate 108 is arranged on a convex platform at a certain height according to the installation requirements of the front drive chain gearbox.

[0060] As Figure 5As shown in the figure, a plurality of transverse webs 114 are provided on the front frame bottom plate 101, corresponding to the positions on the front side of the front frame lifting lug 109, as well as the positions of the front drive chain front bearing seat connecting plate 106 and the front drive chain rear bearing seat connecting plate 107. An intermediate longitudinal web 115 of the front frame is fixed on the front frame bottom plate 101 between the transverse webs 114, and reinforcing ribs 116 of the front frame bottom plate are provided on the front frame bottom plate 101.

[0061] An outer rib plate 103 of the front frame is provided on the outer side of the front frame side longitudinal web 102 corresponding to the transverse web 114, and an inner rib plate 117 of the front frame is arranged at the load-bearing position between the front frame bottom plate 101 and the front frame panel 105.

[0062] As Figure 4 and Figure 5 shown, on the front frame panel 105, a front leg connecting plate 110 of the front large truss, a first intermediate leg connecting plate 111 of the front large truss, and a second intermediate leg connecting plate 112 of the front large truss are successively arranged from front to back, corresponding to the front leg 301 and the first two connection nodes of the front large truss 302 respectively, for connecting with the front large truss 302. And the above three connecting plates respectively correspond to the positions of the transverse webs 114 provided, and can form a consistent stress node through bolt connection.

[0063] In the present invention, the front frame 1 has a left-right symmetric structure, and the respective plates corresponding to each structure are connected in a welding form. The bottom plate is connected to the web, the web is connected to the panel, reinforcing rib plates are arranged at the load-bearing position between the bottom plate and the panel to improve the bearing capacity, reinforcing ribs are arranged on the bottom plate to improve the torsional stiffness, various functional connecting plates are welded on the panel to ensure the perfect connection of the front frame with the front drive chain, truss and rear frame, and lifting lugs are welded on the panel for hoisting the nacelle.

[0064] As Figure 6 、 Figure 7 and Figure 8 shown, the rear frame 2 is used for installing the rear drive chain and yaw system of the tandem dual-rotor wind turbine, and includes a rear frame bottom plate 201 and a rear frame panel 206;

[0065] Both sides of the surface of the rear frame bottom plate 201 are fixedly connected to the rear frame panel 206 through symmetrically arranged rear frame side longitudinal webs respectively; the rear frame side longitudinal webs include an intermediate side longitudinal web 202 and a rear side longitudinal web 203 arranged successively along the longitudinal direction; on the rear frame panel 206, from back to front, a rear drive chain front bearing seat connecting plate 207, a rear drive chain rear bearing seat connecting plate 208, a rear drive chain gearbox elastic support connecting plate 209, a generator rear elastic support connecting plate 211 and a generator front elastic support connecting plate 212 corresponding to the rear drive chain and yaw system structures are successively arranged.

[0066] On the front side of the rear frame panel 206 corresponding to the elastic support connecting plate 209 of the rear drive chain gearbox, a rear frame lifting lug 210 for lifting the frame is provided.

[0067] An X-shaped bracket is correspondingly arranged in the middle of the rear frame panel 206 and the generator; in the middle of the rear frame bottom plate 201, a yaw drive connection bolt hole 218, a yaw bearing connection bolt hole 219, and a yaw caliper connection bolt hole 220 corresponding to the yaw system are provided; in the middle of the rear frame bottom plate 201, a middle transverse web 225 and a curved web 226 supported corresponding to the X-shaped bracket are provided;

[0068] At the rear of the rear frame bottom plate 201, a plurality of rear side transverse webs 221 are arranged at intervals, and a rear frame middle longitudinal web 223 fixed on the rear frame bottom plate 201 is arranged between the rear side transverse webs 221; on the rear frame bottom plate 201, a rear frame bottom plate stiffener 222 is provided;

[0069] On the outside of the rear side longitudinal web 203 corresponding to the rear side transverse web 221, a rear frame outer rib plate 204 is provided, and a rear frame inner rib plate 224 is arranged at the bearing position between the rear frame bottom plate 201 and the rear frame panel 206.

[0070] As Figure 6 、 Figure 7 and Figure 8 shown, on the rear frame panel 206, a rear small truss rear leg connecting plate 213, a rear small truss middle leg connecting plate 214, a rear small truss front leg connecting plate 215, and a front large truss rear leg connecting plate 216 are sequentially arranged from the rear to the front. They respectively correspond to the rear leg 304 and two connection nodes of the rear small truss 303, and the rear connection node of the front large truss 302, and are used to be respectively connected to the rear small truss 303 and the front large truss 302. And the above four connecting plates respectively correspond to the positions of the rear side transverse webs 221 arranged, and can form a consistent stress node through bolt connection. An X-shaped curved web 226 is arranged between the rear side transverse webs 221 corresponding to the rear small truss front leg connecting plate 215 and the front large truss rear leg connecting plate 216 to correspondingly support the X-shaped bracket, and a rear frame middle longitudinal web 223 is arranged on one side of the middle of the curved web 226.

[0071] The connection end of the rear leg 304 and the rear connection end of the rear small truss 303 are connected and fixed through a rear small truss and rear leg connection structure 307. The rear small truss and rear leg connection structure 307 includes connecting plates 314 bolted and fixed on the upper, lower, left, and right four sides of the connection part.

[0072] In the present invention, when the front frame 1 is connected to the rear frame 2, as Figure 1 and Figure 3As shown, a first connection structure protrudes in the middle of the rear end of the front frame 1, and second connection structures extend forward on both sides of the front end of the rear frame 2. Both sides of the second structure protrude to form a structure with a middle depression. The first connection structure is inserted and fixedly connected to the second connection structure; at the docking position, connection and fixation are performed through corresponding connecting plates and bolts. A partial view of the connection structure is as shown in Figure 3 and includes a side-side connecting plate 4 for connecting and fixing the side surface of the docking end, a side-lower connecting plate 5 for connecting and fixing the bottom surface of the docking end, a side-upper connecting plate 6 for connecting and fixing the panel of the docking end, a middle-upper connecting plate 7 for connecting and fixing the panels of the protruding part and the sunken part, a middle-side connecting plate 8 for connecting the middle webs of the protruding part and the sunken part, and a middle-lower connecting plate 9 for connecting the bottom plates of the protruding part and the sunken part. Each connecting plate is connected to the corresponding connecting plates of the front frame 1 and the rear frame 2 by bolts.

[0073] Among them, on the front frame panels 105 on both sides of the first connection structure in the front frame 1, upper pads 113 for connecting the front and rear frames are respectively provided and are fixedly connected to the side-upper connecting plate 6 by bolts; on the front frame side longitudinal webs 102 on both sides of the first connection structure in the front frame 1, side pads 104 for connecting the front and rear frames are respectively provided and are fixedly connected to the side-side connecting plate 4 by bolts; on the last-stage front frame middle longitudinal web 115 corresponding to the protrusion in the middle of the first connection structure in the front frame 1, an intermediate pad 118 for connecting the front and rear frames is provided and is fixedly connected to the middle-side connecting plate 8 by bolts.

[0074] On the rear frame panels 206 of the extended parts on both sides of the second connection structure in the rear frame 2, upper pads 217 for connecting the front and rear frames are respectively provided and are fixedly connected to the side-upper connecting plate 6 by bolts; at the end of the intermediate side longitudinal web 202 of the extended part, side pads 205 for connecting the front and rear frames are provided and are fixedly connected to the side-side connecting plate 4 by bolts; between the rear frame bottom plate 201 and the rear frame panel 206 where the second connection structure is recessed in the rear frame 2, an intermediate pad 227 for connecting the front and rear frames is provided and is fixedly connected to the middle-side connecting plate 8 by bolts.

[0075] In the present invention, the rear frame 2 is also a left-right symmetric structure. Each plate corresponding to each structure in the rear frame 2 is connected in a welded form. The bottom plate is connected to the web, and the web is connected to the panel. Reinforcing rib plates are arranged at the bearing positions between the bottom plate and the panel to improve the bearing capacity. Reinforcing ribs are arranged on the bottom plate to improve the torsional stiffness. Various functional connecting plates are welded on the panel to ensure the sound connection of the rear frame with the rear drive chain, the truss 3, and the front frame 1. Lifting lugs are welded on the panel for hoisting the engine room. Bolt holes for connecting the yaw drive, the yaw bearing, and the yaw caliper are opened on the bottom plate for installing the yaw system.

[0076] The present invention also provides a tandem dual-rotor wind turbine. On the basis of the structure of the above-mentioned main frame, the front frame 1 is installed with the front drive chain of the tandem dual-rotor wind turbine; the rear frame 2 is installed with the rear drive chain and the yaw system of the tandem dual-rotor wind turbine.

[0077] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0079] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. The main frame of a tandem dual-rotor wind turbine, characterized in that, It includes a front frame (1), a rear frame (2) and a truss (3); The length of the front frame (1) is less than that of the rear frame (2); the rear end of the front frame (1) is butt-jointed and fixed to the front end of the rear frame (2), and the panels of the front frame (1) and the rear frame (2) are located on the same horizontal plane to form an installation surface; The lower ends of the truss (3) are respectively installed and fixed to the panels of the front frame (1) and the rear frame (2) through connection nodes; The truss (3) includes a front large truss (302) and a rear small truss (303). The bottom of the front large truss (302) is fixedly connected to the middle section of the panel of the front frame (1) and the front section of the panel of the rear frame (2) through corresponding connection nodes. The bottom of the rear small truss (303) is fixedly connected to the middle section of the panel of the rear frame (2) through a corresponding connection node; the top connection and fixing position of the front large truss (302) and the rear small truss (303) is located above the rear frame (2); The front end of the front large truss (302) is inclined with a front leg (301) connected to the front end of the front frame (1); the rear end of the rear small truss (303) is inclined with a rear leg (304) connected to the rear end of the rear frame (2); The front large truss (302) and the rear small truss (303) are respectively formed by welding upper chords, columns and diagonal braces; Between the upper chords of the front large truss (302), a front cross beam (308), a middle cross beam (309) and a rear cross beam (310) are arranged in sequence from front to back. Diagonal cross beams (311) are arranged diagonally between the front cross beam (308) and the middle cross beam (309), and upper chord longitudinal and transverse beams (312) are arranged parallel to the upper chords between the middle cross beam (309) and the rear cross beam (310).

2. The main frame of a tandem dual-rotor wind turbine according to claim 1, characterized in that, A first connection structure protrudes from the middle of the rear end of the front frame (1), and second connection structures extend forward from both sides of the front end of the rear frame (2). The first connection structure is inserted and fixedly connected to the second connection structure.

3. The main frame of a tandem dual-rotor wind turbine according to claim 1, characterized in that The front frame (1) is used for installing the front drive chain of a tandem dual-rotor wind turbine, and includes a front frame bottom plate (101) and a front frame panel (105); On both sides of the surface of the front frame bottom plate (101), they are respectively fixedly connected to the corresponding front frame panels (105) through symmetrically arranged front frame side longitudinal webs (102); on the front frame panel (105), from front to back, there are successively arranged a front drive chain front bearing seat connecting plate (106), a front drive chain rear bearing seat connecting plate (107) and a front drive chain gearbox elastic support connecting plate (108) corresponding to the front drive chain structure, as well as a front frame lifting lug (109) for lifting the frame.

4. The main frame of a tandem dual-rotor wind turbine according to claim 3, characterized in that, A plurality of transverse webs (114) are provided on the front frame bottom plate (101), corresponding to the positions in front of the front frame lifting lugs (109), as well as the positions of the front drive chain front bearing seat connecting plate (106) and the front drive chain rear bearing seat connecting plate (107). An intermediate longitudinal web (115) of the front frame is fixed on the front frame bottom plate (101) between the transverse webs (114). Front frame bottom plate stiffeners (116) are provided on the front frame bottom plate (101). Front frame outer ribs (103) are provided on the front frame side longitudinal webs (102) corresponding to the outside of the transverse webs (114). Inner ribs (117) of the front frame are arranged at the load-bearing positions between the front frame bottom plate (101) and the front frame panel (105).

5. The main frame of a tandem dual-rotor wind turbine unit according to claim 1, characterized in that, The rear frame (2) is used for installing the rear drive chain and the yaw system of a tandem dual-rotor wind turbine, and includes a rear frame bottom plate (201) and a rear frame panel (206). Both sides of the surface of the rear frame bottom plate (201) are fixedly connected to the rear frame panel (206) respectively through symmetrically arranged rear frame side longitudinal webs. The rear frame side longitudinal webs include an intermediate side longitudinal web (202) and a rear side longitudinal web (203) arranged longitudinally in sequence. On the rear frame panel (206), from back to front, there are successively arranged a rear drive chain front bearing seat connecting plate (207), a rear drive chain rear bearing seat connecting plate (208), a rear drive chain gearbox elastic support connecting plate (209), a rear elastic support connecting plate (211) of the generator, and a front elastic support connecting plate (212) of the generator, A rear frame lifting lug (210) for lifting the frame is provided on the front side of the rear frame panel (206) corresponding to the rear drive chain gearbox elastic support connecting plate (209).

6. The main frame of a tandem dual-rotor wind turbine according to claim 5, characterized in that An X-shaped bracket is correspondingly arranged in the middle of the rear frame panel (206) corresponding to the generator. Yaw drive connection bolt holes (218), yaw bearing connection bolt holes (219), and yaw caliper connection bolt holes (220) corresponding to the yaw system are provided in the middle of the rear frame bottom plate (201). An intermediate transverse web (225) is provided in the middle of the rear frame bottom plate (201), and a curved web (226) is provided for supporting corresponding to the X-shaped bracket. A plurality of rear side transverse webs (221) are arranged at intervals at the rear of the rear frame bottom plate (201). An intermediate longitudinal web (223) of the rear frame is fixed on the rear frame bottom plate (201) between the rear side transverse webs (221). Rear frame bottom plate stiffeners (222) are provided on the rear frame bottom plate (201). Rear frame outer ribs (204) are provided on the rear side longitudinal webs (203) corresponding to the outside of the rear side transverse webs (221). Inner ribs (224) of the rear frame are arranged at the load-bearing positions between the rear frame bottom plate (201) and the rear frame panel (206).

7. A tandem dual-rotor wind turbine, characterized in that, Adopt the main frame according to any one of claims 1-6, wherein the front frame (1) is installed with the front drive chain of the tandem dual-rotor wind turbine; the rear frame (2) is installed with the rear drive chain and the yaw system of the tandem dual-rotor wind turbine.

Images