A generator air outlet device for a wind turbine generator system and a method of assembly

Abstract

The application relates to a generator air outlet device for a wind generating set and an assembling method, and belongs to the field of wind power generation. The device comprises a first frame, a second frame and an air outlet channel. The first frame and the second frame are vertically arranged and detachably connected. The air outlet channel is arranged in a structure formed by the first frame and the second frame. One end of the air outlet channel is connected with an inner wall of one end of the structure formed by the first frame and the second frame. The other end of the air outlet channel is connected with a cabin cover of the wind generating set. The application is favorable for eliminating the problem of easy breaking and tearing caused by unreasonable design and material selection of a soft air outlet channel in the prior art, and prolongs the service life of the soft air outlet channel.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and more particularly to a generator air outlet device and assembly method for wind turbine generator sets. Background Technology

[0002] Existing wind turbine generator sets employ an air-to-air cooling design. During operation, hot air is exhausted through an integral flexible duct system between the nacelle and the generator end. This flexible duct, made of nylon fabric, is fixed at a certain angle to both ends. After the unit has been installed and running for a period of time, the relatively long dimensions of the flexible duct and the angled installation make it difficult to ensure installation quality. This results in the nylon fabric of the flexible duct being easily damaged or torn, affecting the generator's airflow efficiency and consequently impacting the unit's operation.

[0003] To address the issue of easily damaged and torn integral flexible air ducts, the existing solution is to replace the nylon fabric of the flexible air duct with PVC-coated fabric. PVC-coated fabric incorporates plasticizers, anti-aging agents, and other auxiliary materials during its manufacturing process, resulting in better abrasion resistance and weather resistance. Additionally, a supporting steel ring is added to the center of the original flexible air duct, ensuring its overall duct flexibility and enhancing its overall load-bearing capacity, thus effectively preventing damage and tearing.

[0004] After replacing the nylon fabric of the integral flexible air duct with PVC coated fabric, the flexible air duct will not crack or tear in the short term (within six months). However, as the unit operates, the PVC coated fabric flexible air duct will generally crack or tear after one year. Its main disadvantages are as follows:

[0005] (1) Most wind farm units start generating electricity in winter. The ambient temperature is relatively low in winter, while the temperature at the generator outlet is high when the unit is running normally. PVC coated cloth may age faster and have a shorter lifespan in the alternating hot and cold environment.

[0006] (2) Only one supporting steel ring is arranged in the middle of the flexible air duct, which cannot play the optimal supporting role. As a result, the overall structure of the flexible air duct is subjected to large local stress, and the shape is difficult to control. During operation, it shakes a lot and may be damaged by collision and friction with other components in the cabin cover, ultimately leading to the failure of the entire flexible air duct.

[0007] (3) The inclined soft air duct design with a certain angle increases the difficulty of assembly quality control.

[0008] Therefore, the existing solutions do not provide long-lasting protection against cracking and tearing of flexible air ducts, and do not fundamentally solve the problem. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a generator air outlet device and assembly method for wind turbine generator sets, so as to solve the above-mentioned problem.

[0010] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A generator air outlet device for a wind turbine generator set includes: a first frame, a second frame, an air outlet duct, a first connecting mechanism, and a second connecting mechanism. The first frame and the second frame are vertically arranged and detachably connected. The air outlet duct is arranged within the structure formed by the first frame and the second frame. One end of the air outlet duct is connected to the inner wall of one end of the structure formed by the first frame and the second frame through the second connecting mechanism. The other end of the air outlet duct is connected to the nacelle cover of the wind turbine generator set through the first connecting mechanism.

[0011] The beneficial effects of this invention are as follows: By configuring the generator air outlet device as a vertical and detachably connected first and second frame, it is advantageous to ensure that the air outlet duct installed inside is vertically positioned and its length is compatible with the distance between the nacelle and the generator of the wind turbine. This avoids breakage caused by friction between the air outlet duct and other components due to excessive duct length, and prevents the generator's hot air from failing to exit the nacelle, which could trigger a high-temperature alarm inside the nacelle and reduce the generator's power output. Furthermore, it helps to reduce the size of the generator air outlet device, facilitating hoisting and matching the generator nacelle hoisting opening, avoiding the inability to pass through the nacelle hoisting opening due to excessive size. In addition, the vertically positioned air outlet duct makes it easier to control assembly quality compared to the inclined type in the prior art. This generator air outlet device can also be extended to similar megawatt-class wind turbines, reducing the maintenance rate of the generator and nacelle, and lowering the maintenance costs of the wind turbine.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, it also includes a frame connection mechanism, through which the first frame and the second frame are connected. Steel plates are provided on the periphery of the first frame and the second frame, and the first frame, the second frame and the steel plates form a tubular structure.

[0014] The beneficial effects of adopting the above-mentioned further solution are: the steel plates set on the periphery of the first frame and the second frame help to ensure the rigidity, strength and stability of the entire air outlet device, and enhance the overall uniformity of the stress on the air outlet device.

[0015] Furthermore, the air outlet duct is a tubular structure made of polyvinyl chloride material.

[0016] The beneficial effects of adopting the above-mentioned further solutions are: polyvinyl chloride material has the characteristics of high elasticity, high strength, high temperature resistance, cold resistance and wear resistance, which further improves the service life of the air outlet duct.

[0017] Furthermore, it also includes: a nacelle cover connection, a generator connection, and a locking connector. The two ends of the first frame and the second frame correspond one-to-one as the nacelle cover end and the generator end. The nacelle cover end connects the air outlet duct to the nacelle cover connection through the first connecting mechanism. The nacelle cover connection is located on the nacelle cover of the wind turbine generator set. The generator end is connected to the generator connection through the locking connector.

[0018] The advantages of adopting the above-mentioned further solution are: it is beneficial to fix one end of the air outlet device to the generator connection and make the other end abut against the nacelle cover connection, thereby making the length of the air outlet device and the length of the air outlet duct installed inside it compatible with the distance between the nacelle cover and the generator of the wind turbine generator set, and avoiding the breakage caused by the air outlet duct rubbing against other components due to excessive air outlet duct margin.

[0019] The first connecting mechanism includes a plurality of first pressure strips and a plurality of first rivets. The air outlet duct located at the end of the nacelle cover is disposed between the first pressure strip and the connection point of the nacelle cover. The first rivets pass through the first pressure strip and the air outlet duct and are connected to the connection point of the nacelle cover.

[0020] The beneficial effects of adopting the above-mentioned further solution are: the first pressure strip and the first rivet help to fix the air outlet duct located at the end of the nacelle cover to the nacelle cover connection, so that hot air is discharged through the air outlet duct when the generator is running.

[0021] Furthermore, the second connecting mechanism includes a plurality of second pressure strips and a plurality of second rivets. The air outlet duct located at the generator end is disposed between the second pressure strip and the inner walls of the first frame and the second frame. The second pressure strip is wrapped around the inner and outer walls of the first frame and the second frame. The second rivets pass through the second pressure strip on the inner wall of the first frame and the second frame and the air outlet duct, and are connected to the second pressure strip on the outer wall of the first frame and the second frame.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the second pressure strip, together with the second rivet, helps to form a sealed connection between the air outlet duct and the inner walls of the first frame and the second frame, thus preventing the hot air from the generator from being completely discharged from the air outlet duct during operation.

[0023] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: An assembly method for a generator air outlet device for a wind turbine generator set, comprising the following steps:

[0024] S1: Hoist the first frame, the second frame, and the air outlet duct to the nacelle of the wind turbine;

[0025] S2: Connect the first frame to the second frame and form a tubular structure with steel plates;

[0026] S3: Connect the bottom end of the air outlet duct to the inner wall of the bottom end of the tubular structure formed in step S2 through the second connecting mechanism;

[0027] S4: Connect the bottom end of the tubular structure formed in step S2 to the generator of the wind turbine generator set.

[0028] connect;

[0029] S5: Pull the air outlet duct upwards out of the tubular structure formed in step S2, so that the air outlet duct is in a vertical state;

[0030] S6: Connect the side wall of the air outlet duct in step S5 to the nacelle of the wind turbine generator set through the first connecting mechanism.

[0031] S7: Cut off the first connecting mechanism and air outlet duct that are higher than the nacelle cover of the wind turbine generator.

[0032] The beneficial effects of this invention are: by reserving a redundant length for the air outlet duct at the nacelle cover end of the wind turbine generator, it is beneficial to cut the length of the first pressure strip in the first connecting mechanism and drill the hole position according to the actual site conditions, which greatly avoids the problem of the air outlet duct being unable to be installed or breaking after installation due to incorrect drilling of the pressure strip hole position. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention. Figure 1 ;

[0034] Figure 2 A schematic diagram of the overall structure provided for an embodiment of the present invention. Figure 2 ;

[0035] Figure 3 A cross-sectional view provided for an embodiment of the present invention;

[0036] Figure 4 A flowchart of the assembly method provided in an embodiment of the present invention.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. First frame; 2. Second frame; 3. Air outlet duct; 4. Nacelle cover end; 5. Generator end; 6. Frame connecting mechanism; 7. First connecting mechanism; 8. Second connecting mechanism; 9. Nacelle cover connection; 10. Generator connection; 11. Locking connector; 71. First pressure strip; 72. First rivet; 81. Second pressure strip; 82. Second rivet. Detailed Implementation

[0039] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0040] like Figures 1 to 3 As shown, a generator air outlet device for a wind turbine generator set includes: a first frame 1, a second frame 2, an air outlet duct 3, a first connecting mechanism 7, and a second connecting mechanism 8. The first frame 1 and the second frame 2 are vertically arranged and detachably connected. The air outlet duct 3 is disposed within the structure formed by the first frame 1 and the second frame 2. One end of the air outlet duct 3 is connected to the inner wall of one end of the structure formed by the first frame 1 and the second frame 2 through the second connecting mechanism 8. The other end of the air outlet duct 3 is connected to the nacelle cover of the wind turbine generator set through the first connecting mechanism 7.

[0041] The beneficial effects of this invention are as follows: By configuring the generator air outlet device as a vertical and detachably connected first and second frame, it is advantageous to ensure that the air outlet duct installed inside is vertically positioned and its length is compatible with the distance between the nacelle and the generator of the wind turbine. This avoids breakage caused by friction between the air outlet duct and other components due to excessive duct length, and prevents the generator's hot air from failing to exit the nacelle, which could trigger a high-temperature alarm inside the nacelle and reduce the generator's power output. Furthermore, it helps to reduce the size of the generator air outlet device, facilitating hoisting and matching the generator nacelle hoisting opening, avoiding the inability to pass through the nacelle hoisting opening due to excessive size. In addition, the vertically positioned air outlet duct makes it easier to control assembly quality compared to the inclined type in the prior art. This generator air outlet device can also be extended to similar megawatt-class wind turbines, reducing the maintenance rate of the generator and nacelle, and lowering the maintenance costs of the wind turbine.

[0042] Preferred, such as Figure 1 and Figure 2 As shown, it also includes a frame connection mechanism 6, through which the first frame 1 and the second frame 2 are connected. Steel plates are provided on the periphery of the first frame 1 and the second frame 2, and the first frame 1, the second frame 2 and the steel plates form a tubular structure.

[0043] It should be noted that, in a preferred embodiment of the present invention, the frame connection mechanism 6 is a combination of multiple bolts, nuts and washers.

[0044] The advantages of adopting the above-mentioned preferred scheme are: the steel plates set on the periphery of the first frame and the second frame help to ensure the rigidity, strength and stability of the entire air outlet device, and enhance the overall uniformity of the stress on the air outlet device.

[0045] Preferably, the air outlet duct 3 is a tubular structure made of polyvinyl chloride material.

[0046] It should be noted that the air outlet duct 3, made of polyvinyl chloride, is a flexible tubular structure.

[0047] The beneficial effects of adopting the above-mentioned preferred solution are: polyvinyl chloride material has the characteristics of high elasticity, high strength, high temperature resistance, cold resistance and wear resistance, which further improves the service life of the air outlet duct.

[0048] Preferred, such as Figures 1 to 3 As shown, it also includes: nacelle cover connection 9, generator connection 10 and locking connector 11. The two ends of the first frame 1 and the second frame 2 correspond one-to-one as nacelle cover end 4 and generator end 5. The nacelle cover end 4 connects the air outlet 3 to the nacelle cover connection 9 through the first connecting mechanism 7. The nacelle cover connection 9 is set on the nacelle cover of the wind turbine generator set. The generator end 5 is connected to the generator connection 10 through the locking connector 11.

[0049] It should be noted that, in a preferred embodiment of the present invention, the locking connector 11 is a combination of multiple bolts, nuts and washers.

[0050] The advantages of adopting the above-mentioned preferred solution are: it is beneficial to fix one end of the air outlet device to the generator connection and make the other end abut against the nacelle cover connection, thereby making the length of the air outlet device and the length of the air outlet duct installed inside it compatible with the distance between the nacelle cover and the generator of the wind turbine generator set, and avoiding the breakage caused by the air outlet duct rubbing against other components due to excessive air outlet duct margin.

[0051] Preferred, such as Figure 3 As shown, the first connecting mechanism 7 includes a plurality of first pressure strips 71 and a plurality of first rivets 72. The air outlet 3 located at the end 4 of the nacelle cover is disposed between the first pressure strips 71 and the connection point 9 of the nacelle cover. The first rivets 72 pass through the first pressure strips 71 and the air outlet 3 and are connected to the connection point 9 of the nacelle cover.

[0052] It should be noted that, in the technical solution of this application, since the air outlet 3 is a tubular structure, in order to fix the air outlet 3 of the nacelle cover end 4 to the nacelle cover connection 9, a plurality of first pressure strips 71 are wrapped around the inner wall of the air outlet 3, and the first pressure strips 71 are fixed to the nacelle cover connection 9 by a plurality of first rivets 72, thereby forming a seal between the air outlet 3 of the nacelle cover end 4 and the first pressure strips 71 and the nacelle cover connection 9.

[0053] The advantages of adopting the above-mentioned preferred solution are: the first pressure strip and the first rivet help to fix the air outlet duct located at the end of the nacelle cover to the nacelle cover connection, so that the hot air of the generator can be discharged through the air outlet duct when it is running.

[0054] Preferred, such as Figure 3 As shown, the second connecting mechanism 8 includes a plurality of second pressure strips 81 and a plurality of second rivets 82. The air outlet duct 3 located at the generator end 5 is disposed between the second pressure strips 81 and the inner walls of the first frame 1 and the second frame 2. The second pressure strips 81 are wrapped around the inner and outer walls of the first frame 1 and the second frame 2. The second rivets 82 pass through the second pressure strips 81 on the inner walls of the first frame 1 and the second frame 2 and the air outlet duct 3, and are connected to the second pressure strips 81 on the outer walls of the first frame 1 and the second frame 2.

[0055] The advantages of adopting the above-mentioned preferred solution are: the second pressure strip and the second rivet help to form a sealed connection between the air outlet duct and the inner walls of the first frame and the second frame, so as to prevent the hot air from the generator from being completely discharged from the air outlet duct during operation.

[0056] like Figure 4 As shown, an assembly method for a generator air outlet device for a wind turbine generator set includes the following steps:

[0057] S1: Hoist the first frame 1, the second frame 2 and the air outlet duct 3 to the nacelle of the wind turbine;

[0058] S2: Connect the first frame 1 and the second frame 2, and form a tubular structure with steel plates;

[0059] S3: Connect the bottom end of the air outlet duct 3 to the inner wall of the bottom end of the tubular structure formed in step S2 through the second connecting mechanism 8;

[0060] S4: Connect the bottom end of the tubular structure formed in step S2 to the generator of the wind turbine generator set.

[0061] connect;

[0062] S5: Pull the air outlet 3 upward out of the tubular structure formed in step S2, so that the air outlet 3 is in a vertical state;

[0063] S6: Connect the side wall of the air outlet duct 3 in step S5 to the nacelle cover of the wind turbine generator set through the first connecting mechanism 7.

[0064] S7: Cut off the first connecting mechanism 7 and the air outlet duct 3, which are higher than the nacelle cover of the wind turbine generator.

[0065] It should be noted that in step S1, the wind turbine generator is lifted by the nacelle cantilever. If the existing damaged integral flexible duct needs to be replaced by the air outlet device of the present invention, the original damaged integral flexible duct needs to be disassembled and placed in the nacelle of the wind turbine generator before step S1. After the air outlet device of the present invention is installed, the existing damaged integral flexible duct is then lifted to the tower.

[0066] In step S2, the first frame 1 and the second frame 2 are connected by the frame connection mechanism 6;

[0067] In step S4, the bottom end of the tubular structure is the generator end 5, and the generator end 5 is connected to the generator connection 10 through the locking connector 11;

[0068] In step S6, the first pressure strip 71 with redundant length and the side wall of the air outlet 3 are connected to the nacelle cover connection 9 by the first rivet 72, so that the air outlet 3 is fixed on the nacelle cover of the wind turbine generator set.

[0069] In step S7, the first pressure strip 71 and the air outlet 3, which are above the nacelle cover connection 9, are cut off.

[0070] The beneficial effects of this invention are: by reserving a redundant length for the air outlet duct at the nacelle cover end of the wind turbine generator, it is beneficial to cut the length of the first pressure strip in the first connecting mechanism and drill the hole position according to the actual site conditions, which greatly avoids the problem of the air outlet duct being unable to be installed or breaking after installation due to incorrect drilling of the pressure strip hole position.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for assembling a generator air outlet device for a wind turbine generator set, characterized in that, The generator air outlet device includes: a first frame (1), a second frame (2), an air outlet duct (3), a first connecting mechanism (7), and a second connecting mechanism (8). The first frame (1) and the second frame (2) are vertically arranged and detachably connected. The air outlet duct (3) is arranged in the structure formed by the first frame (1) and the second frame (2). One end of the air outlet duct (3) is connected to the inner wall of one end of the structure formed by the first frame (1) and the second frame (2) through the second connecting mechanism (8). The other end of the air outlet duct (3) is connected to the nacelle cover of the wind turbine generator set through the first connecting mechanism (7). The air outlet duct (3) is a tubular structure made of polyvinyl chloride material; The assembly method includes the following steps: S1: Hoist the first frame (1), the second frame (2) and the air outlet duct (3) to the nacelle of the wind turbine; S2: Connect the first frame (1) to the second frame (2) and form a tubular structure with steel plates; S3: Connect the bottom end of the air outlet duct (3) to the inner wall of the bottom end of the tubular structure formed in step S2 through the second connecting mechanism (8); S4: Connect the bottom end of the tubular structure formed in step S2 to the generator of the wind turbine generator set; S5: Pull the air outlet (3) upward out of the tubular structure formed in step S2, so that the air outlet (3) is in a vertical state; S6: Connect the side wall of the air outlet duct (3) in step S5 to the nacelle cover of the wind turbine generator set through the first connecting mechanism (7); S7: Cut off the first connecting mechanism (7) and the air outlet (3) above the nacelle cover of the wind turbine generator set.

2. The assembly method of the generator air outlet device for a wind turbine generator set according to claim 1, characterized in that, It also includes a frame connection mechanism (6), the first frame (1) and the second frame (2) are connected by the frame connection mechanism (6), and steel plates are provided on the periphery of the first frame (1) and the second frame (2), forming a tubular structure with the first frame (1), the second frame (2) and the steel plates.

3. The assembly method of the generator air outlet device for a wind turbine generator set according to claim 1, characterized in that, Also includes: The nacelle cover connection (9), generator connection (10) and locking connector (11) are provided. The two ends of the first frame (1) and the second frame (2) correspond one-to-one as the nacelle cover end (4) and the generator end (5). The nacelle cover end (4) connects the air outlet (3) to the nacelle cover connection (9) through the first connecting mechanism (7). The nacelle cover connection (9) is provided on the nacelle cover of the wind turbine generator set. The generator end (5) is connected to the generator connection (10) through the locking connector (11).

4. The assembly method of the generator air outlet device for a wind turbine generator set according to claim 3, characterized in that, The first connecting mechanism (7) includes a plurality of first pressure strips (71) and a plurality of first rivets (72). The air outlet (3) located at the end of the nacelle cover (4) is disposed between the first pressure strips (71) and the connection point (9) of the nacelle cover. The first rivets (72) pass through the first pressure strips (71) and the air outlet (3) and are connected to the connection point (9) of the nacelle cover.

5. The assembly method of the generator air outlet device for a wind turbine generator set according to claim 3, characterized in that, The second connecting mechanism (8) includes a plurality of second pressure strips (81) and a plurality of second rivets (82). The air outlet duct (3) located at the generator end (5) is disposed between the second pressure strip (81) and the inner wall of the first frame (1) and the second frame (2). The second pressure strip (81) is wrapped around the inner and outer walls of the first frame (1) and the second frame (2). The second rivets (82) pass through the second pressure strip (81) on the inner wall of the first frame (1) and the second frame (2) and the air outlet duct (3), and are connected to the second pressure strip (81) on the outer wall of the first frame (1) and the second frame (2).

Images