Wind generating set and integrated transmission chain thereof

Abstract

The utility model discloses a wind generating set and an integrated transmission chain thereof, the integrated transmission chain comprises a gear box and a generator, an output shaft of the gear box is connected with a rotor of the generator, and a cavity is arranged between the gear box and the generator. An isolation structure is arranged between the gearbox and the generator, the isolation structure is installed on the gearbox, and the isolation structure wraps the output shaft and is in clearance fit with a rotor of the generator so as to divide the cavity into an output shaft area wrapping the output shaft and a cooling air circulation area located on the outer side. According to the wind generating set and the integrated transmission chain thereof, generator cooling air flow cannot enter the gear box output shaft area when passing through the rotor hub area, so that harmful positive pressure or negative pressure caused by the influence of the generator cooling air flow on the gear box output shaft area is avoided; therefore, the problem of lubricating oil leakage caused by positive pressure or negative pressure in the output shaft area of the gearbox is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field, concretely relates to a wind generating set and integrated drive chain thereof. BACKGROUND

[0002] With the wind power market competition, the price of wind power equipment is continuously reduced, and the wind turbine manufacturer must continuously reduce the manufacturing cost under the premise of ensuring that the performance meets the requirements. In the unit composition, the cost and performance of the drive chain directly determine the cost and performance of the unit.

[0003] The traditional wind turbine drive chain contains hub, main shaft, main shaft bearing, bearing seat, gear box, generator and shaft coupling and other components. In order to improve the market competitiveness, the development trend of the wind turbine drive chain is to integrate the main shaft, main shaft bearing, main shaft bearing seat, gear box, generator and other components into an integrated structure, thereby canceling part of the shaft coupling, sharing the box structure, so as to reduce the number of parts and shorten the length of the drive chain to reduce the weight, so as to achieve the purpose of reducing the cost. The unit of such structure is usually called full integrated drive chain wind turbine, and there is also a semi-integrated structure that integrates the gear box and the generator in the drive chain, and the remaining components are not integrated.

[0004] In the full integrated drive chain, the speed increasing gear box input shaft and the rear end of the main shaft are rigidly connected as a whole by bolts (or bolts + pins), so as to realize the torque transmission of the main shaft to the gear box; the front box body of the gear box and the main shaft bearing seat are rigidly connected as a whole by bolts; the rear box body of the gear box and the generator stator shell are rigidly connected as a whole; the generator rotor and the gear box output shaft are directly connected or connected through a shaft coupling. In the semi-integrated structure of the gear box and the generator, the gear box and the main shaft are not integrated, but the rear box body of the gear box and the generator stator shell are rigidly connected as a whole; the generator rotor and the gear box output shaft are integrated as a whole.

[0005] Compared with the traditional wind power drive chain structure, it can be seen that one of the main features of the full integrated or semi-integrated (gear box and generator integrated) drive chain structure is that the generator is not an independent component, but the stator and the rotor are respectively suspended and installed at the rear end of the gear box, and are combined with the gear box as a whole to form a gear box-generator integrated assembly. This integrated assembly has the advantages of compact structure, light weight and low cost.

[0006] However, there are also disadvantages, that is, when the generator is working, air circulation is needed to cool the inside of the generator to prevent the temperature from being too high due to heat. Since the stator and the rotor of the generator are respectively installed on the rear box body of the gear box and the output shaft, the output shaft and the sealing end cover of the gear box are located in the middle of the cooling air passage of the generator. The cooling air generates positive pressure or negative pressure at the output shaft position, resulting in oil leakage of the gear box, which is prone to cause huge maintenance cost and loss of power generation. CONTENT OF THE UTILITY MODEL

[0007] Therefore, it is necessary to provide a wind turbine generator and an integrated transmission chain to solve the problem of positive pressure or negative pressure of cooling air at the output shaft position, resulting in gear box oil leakage.

[0008] An integrated transmission chain comprises a gear box and a generator, an output shaft of the gear box is connected to a rotor of the generator, and a cavity is provided between the gear box and the generator;

[0009] An isolation structure is provided between the gear box and the generator, the isolation structure is mounted on the gear box, the isolation structure is wrapped outside the output shaft and gap-fitted with the rotor of the generator, so as to divide the cavity into an output shaft area surrounding the output shaft and a cooling air circulation area located on the outside.

[0010] In one embodiment, the isolation structure comprises a cylindrical isolation cover, the isolation cover comprises opposite first and second end portions, the first end portion is provided with a connecting flange for mounting on the gear box, and the second end portion is gap-fitted with the rotor of the generator.

[0011] In one embodiment, an end face of the second end portion of the isolation cover is provided with an end face ring, and the end face ring extends beyond the inner wall of the isolation cover in the radial direction of the isolation cover.

[0012] In one embodiment, a baffle labyrinth gap is formed between the second end portion of the isolation cover and the rotor of the generator.

[0013] In one embodiment, a sealing ring is provided on the rotor of the generator, and the sealing ring at least partially overlaps the isolation cover in the axial direction.

[0014] In one embodiment, the sealing ring is provided on at least one of the inner and outer sides of the isolation cover.

[0015] In one embodiment, an end face of the second end portion of the isolation cover is formed with a plug-in groove, and a sealing ring is provided on the rotor of the generator and inserted into the plug-in groove.

[0016] In one embodiment, the second end portion of the isolation cover is provided with a ring groove or a spiral groove.

[0017] In one embodiment, the rotor of the generator comprises a hub transition flange, and the hub transition flange is provided with a vent hole for communicating the output shaft area with the outside.

[0018] A wind turbine generator comprises:

[0019] The integrated transmission chain according to any one of the above.

[0020] The wind turbine and the integrated transmission chain thereof, the isolation structure separates the cavity into an output shaft area surrounding the output shaft and a cooling air circulation area outside, separates the cooling air circulation area and the output shaft area, so that the generator cooling air flow does not enter the gear box output shaft area when passing through the rotor hub area, avoiding the gear box output shaft area being affected by the generator cooling air flow to generate harmful positive pressure or negative pressure, thereby avoiding the problem of lubricating oil leakage caused by the gear box output shaft area having positive pressure or negative pressure. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiment of the present application, the drawings needed in the specific embodiment will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic diagram of the integrated transmission chain in an embodiment;

[0023] Figure 2 It is Figure 1 It is an enlarged view of the isolation structure;

[0024] Figure 3 It is a schematic diagram of the second end of the isolation cover designed with an end face ring;

[0025] Figure 4 It is a schematic diagram of the sealing ring on the generator rotor and the isolation cover forming a baffling seal;

[0026] Figure 5 It is a schematic diagram of the sealing ring on the generator rotor and the insertion slot of the isolation cover forming a baffling seal;

[0027] Figure 6 It is a schematic diagram of the sealing ring on the generator rotor and the end face ring cooperating to seal;

[0028] Figure 7 It is a schematic diagram of the second end of the isolation cover designed with an annular groove.

[0029] Reference signs:

[0030] 10-gear box, 11-output shaft, 20-generator, 21-rotor, 211-hub transition flange, 212-vent hole, 213-sealing ring, 22-stator, 30-isolation structure, 31-output shaft area, 32-cooling air circulation area, 33-isolation cover, 331-first end, 332-second end, 34-connection flange, 35-end face ring, 36-insertion slot, 37-annular groove. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] like Figure 1 As shown, compared to traditional wind turbine drive train structures, a key feature of fully integrated or semi-integrated (gearbox 10 and generator 20 integrated) drive train structures is that generator 20 is not a separate component. Instead, the stator 22 and rotor 21 are separately suspended from the rear end of the gearbox 10, forming a single integrated gearbox 10-generator 20 assembly. This integrated assembly offers the advantages of compact structure, light weight, and low cost.

[0035] However, there are also disadvantages: when the generator 20 is operating, air circulation is required to cool the inside of the generator 20 to prevent overheating due to heat generation. Because the stator 22 and rotor 21 of the generator 20 are respectively mounted on the rear housing of the gearbox 10 and the output shaft 11, the output shaft 11 and sealing end cover of the gearbox 10 are located in the middle of the cooling air channel of the generator 20.

[0036] When the generator 20 is working, the cooling air first enters the area between the generator 20 and the rear end of the gearbox 10, and the area is distributed with the output shaft 11 of the gearbox 10 and the sealing end cover, and then flows through the air gap between the stator 22 and the rotor 21 to take away the heat generated by the generator 20. Since the circulating cooling air flow has a high pressure, the positive pressure of the air will act on the sealing structure of the output shaft 11. Therefore, when the sealing structure at the position of the output shaft 11 cannot withstand the action of the air pressure or the sealing material is worn, the positive pressure air in the area can easily blow into the inside of the gearbox 10, mix with the oil droplets, oil mist, etc. sprayed in the inside of the gearbox 10, and then overflow from the air filter, the input end cover, etc. of the gearbox 10, causing the lubricating oil to leak, further polluting the engine room, causing safety hazards or failure of other components, and in severe cases, the lubricating oil further leaks to the outside of the engine room, causing environmental pollution accidents.

[0037] When the generator 20 cooling air flow is in the opposite direction, a negative pressure is generated at the position of the gear output shaft 11. When the sealing structure at the position of the output shaft 11 cannot withstand the action of the air pressure or the sealing material is worn, the negative pressure will cause the air in the inside of the gearbox 10 to wrap the lubricating oil or oil mist and leak from the sealing position of the output shaft 11 to the rear end of the gearbox 10, further polluting the generator 20 or the engine room, causing generator 20 failure, engine room pollution, etc. accidents.

[0038] Since the output shaft 11 and the end cover components are located at the rear end of the gearbox 10 and are surrounded by the generator 20 in the center, once the oil leakage failure occurs, it is very difficult to maintain / replace in the engine room. If the situation is serious, even large cranes (land) or hoisting ships (ocean) are needed to remove the gearbox 10 and the generator 20 as a whole from the engine room, then transport them to the manufacturing plant, disassemble the generator 20 from the rear end of the gearbox 10, and then complete the repair; after the repair is completed, it needs to be transported to the site, and a large crane or hoisting ship is needed to complete the reinstallation. The whole process is heavy, the hoisting cost is extremely high, and the final maintenance cost is high. In addition, due to the above-mentioned disassembly, transportation, maintenance, hoisting and reinstallation, the whole maintenance cycle is long, and the loss of power generation caused by shutdown is huge.

[0039] In view of this, in order to solve the above problems, the application provides a wind turbine generator and an integrated transmission chain thereof, which separates the output shaft area and the cooling air circulation area by using an isolation structure, so that the generator 20 cooling air flow will not enter the output shaft area of the gearbox 10 when passing through the rotor 21 hub area.

[0040] In order to better understand the technical solutions and beneficial effects of the application, the application will be further described in detail in combination with specific embodiments:

[0041] A wind turbine generator, comprising Figure 1The integrated transmission chain shown includes a gear box 10 and a generator 20, an output shaft 11 of the gear box 10 is connected to a rotor 21 of the generator 20, and a cavity is provided between the gear box 10 and the generator 20.

[0042] An isolation structure 30 is provided between the gear box 10 and the generator 20, the isolation structure 30 is mounted on the gear box 10, the isolation structure 30 is wrapped outside the output shaft 11, and the isolation structure 30 is in clearance fit with the rotor 21 of the generator 20. The isolation structure 30 can separate the cavity into an output shaft area 31 wrapped around the output shaft 11 and a cooling air circulation area 32 located on the outside. The cooling air circulation area 32 and the output shaft area 31 are isolated, so that when the cooling air flow of the generator 20 passes through the hub area of the rotor 21, it will not enter the output shaft area 31 of the gear box 10, avoiding the output shaft area 31 of the gear box 10 being affected by the cooling air flow of the generator 20 to generate harmful positive pressure or negative pressure.

[0043] Please refer to Figure 2 In an embodiment, the isolation structure 30 includes a cylindrical isolation cover 33, the isolation cover 33 includes opposite first and second end portions 331 and 332, the first end portion 331 is provided with a connecting flange 34, and the first end portion 331 is mounted on the gear box 10 through the connecting flange 34. Since the rotor 21 of the generator 20 rotates during operation, the second end portion 332 of the isolation cover 33 is in clearance fit with the rotor 21 of the generator 20.

[0044] In this embodiment, the connecting flange 34 is mounted on the box body outside the sealing end cover of the output shaft 11 or on the bearing seat of the output shaft 11. The second end portion 332 of the isolation cover 33 is in small clearance fit with the hub transition flange 211 of the rotor 21 of the generator 20, and the clearance value is selected according to the process economic tolerance of the parts and verified by simulation means.

[0045] In an embodiment, the cooling air circulation area 32 of the generator 20 and the output shaft area 31 of the gear box 10 are generally isolated by the isolation cover 33, but due to the clearance, the circulating air flow of the generator 20 can still have a slight effect on the output shaft area 31. Therefore, in this application, a plurality of air vents 212 are designed on the hub transition flange 211 of the generator 20, the air vents 212 are in communication with the outside atmosphere, so as to ensure that the air pressure of the output shaft area 31 is basically the same as the cabin atmospheric pressure, and the possibility of gear box 10 oil leakage caused by positive pressure or negative pressure of air in this part is eliminated.

[0046] In an embodiment, the second end portion 332 of the isolation cover 33 is only a basic cylindrical structure, which is in fit with the inner hole on the hub of the generator 20 by relying on the local length of the outer cylindrical surface to form a clearance seal.

[0047] Please refer toFigure 3 In another embodiment, the end face of the second end portion 332 of the isolation cover 33 is provided with an end face ring 35 extending beyond the inner wall of the isolation cover 33 in the radial direction of the isolation cover 33. The end face ring 35 is also in a small gap fit with the hub transition flange 211 of the rotor 21 of the generator 20. The sealing effect is improved due to the radial fit gap of the outer circular face and the fit gap of the end face.

[0048] In an embodiment, a labyrinth gap is formed between the second end portion 332 of the isolation cover 33 and the rotor 21 of the generator 20 to improve the sealing effect. The number of layers of the labyrinth seal can be increased as needed to improve the sealing effect according to the sealing requirements. For example, 3 or 4 layers of the labyrinth seal can be used. The more the number of layers, the better the sealing effect.

[0049] Please refer to Figure 4 On the basis of the above embodiments, further, the rotor 21 of the generator 20 is provided with a sealing ring 213 at least partially overlapping the isolation cover 33 in the axial direction. The sealing ring 213 cooperates with the side wall of the isolation cover 33 to form a labyrinth gap therebetween. At least one of the inner and outer sides of the isolation cover 33 is provided with the sealing ring 213.

[0050] That is, the sealing ring 213 can be designed on the outer side of the isolation cover 33, or on the inner side of the isolation cover 33, or on both the inner and outer sides of the isolation cover 33. It can be understood that the sealing effect can be improved by increasing the sealing fit width and the number of layers, i.e. increasing the length and number of the sealing ring 213.

[0051] Please refer to Figure 5 On the basis of the above embodiments, further, a plug-in groove 36 can be formed on the end face of the second end portion 332 of the isolation cover 33, and the rotor 21 of the generator 20 is provided with a sealing ring 213 inserted into the plug-in groove 36 to form a labyrinth gap therebetween. In this embodiment, the inner wall of the isolation cover 33 is provided with an L-shaped sealing block, and the sealing block and the inner wall of the isolation groove jointly enclose the plug-in groove 36. Of course, in other embodiments, the sealing block can also be designed on the outer wall of the isolation cover.

[0052] Please refer to Figure 6 In an embodiment, the sealing ring 213 and the end face ring 35 can be combined to improve the sealing effect of the gap between the isolation cover 33 and the hub transition flange 211 of the rotor 21. For example, the sealing ring 213 can be installed on the hub transition flange 211 of the rotor 21, and the sealing ring 213 is located on the outer side of the isolation cover 33. The end face of the isolation cover 33 is designed with the end face ring 35 extending a certain length towards the inner cavity of the isolation cover 33.

[0053] Please refer to Figure 7 In an embodiment, to ensure the sealing effect of the gap between the isolation cover 33 and the hub transition flange 211 of the rotor 21, a ring groove 37 or a spiral groove can also be designed at the second end 332 of the isolation cover 33. Among them, due to the existence of the ring groove 37, the air flow through this position will generate vortex in the groove, increasing the resistance of air flow, thereby improving the sealing effect. If the spiral groove design is adopted, cooperating with the rotation direction, the spiral groove can also generate a thrust force opposite to the flow direction of the leakage air flow, and if designed properly, it can completely prevent air flow from passing through.

[0054] The above wind turbine and its integrated transmission chain, the isolation structure 30 separates the cavity into the output shaft area 31 surrounding the output shaft 11 and the outer cooling air circulation area 32, separates the cooling air circulation area 32 and the output shaft area 31, so that the cooling air flow of the generator 20 will not enter the output shaft area 31 of the gearbox 10 when passing through the hub area of the rotor 21, avoiding the output shaft area 31 of the gearbox 10 being affected by the cooling air flow of the generator 20 to generate harmful positive pressure or negative pressure, thereby avoiding the problem of lubricating oil leakage caused by the output shaft area 31 of the gearbox 10 having positive pressure or negative pressure. A plurality of air holes 212 are designed on the hub transition flange 211 of the generator 20, the air holes 212 are in communication with the outside atmosphere, thereby ensuring that the air pressure of the output shaft area 31 is basically the same as the cabin atmospheric pressure, and the possibility of oil leakage of the gearbox 10 due to the air having positive pressure or negative pressure at this position is eliminated.

[0055] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the specification of the present application.

Claims

1. An integrated drive chain, characterized by, The utility model relates to a gear box and a generator, the output shaft of the gear box is connected with the rotor of the generator, and there is a cavity between the gear box and the generator. An isolation structure is arranged between the gear box and the generator, the isolation structure is mounted on the gear box, the isolation structure is wrapped outside the output shaft and fits with the rotor of the generator in a clearance, so as to separate the cavity into an output shaft area wrapped around the output shaft and a cooling air circulation area located on the outside. The isolation structure comprises a cylindrical isolation cover, the isolation cover comprises opposite first and second end portions, the first end portion is provided with a connecting flange for mounting on the gear box, and the second end portion fits with the rotor of the generator in a clearance.

2. The integrated drive chain of claim 1, wherein, An end face of the second end portion of the isolation cover is provided with an end face ring, the end face ring extends beyond the inner wall of the isolation cover in the radial direction of the isolation cover.

3. The integrated drive chain of claim 2, wherein, A baffle labyrinth gap is formed between the second end portion of the isolation cover and the rotor of the generator.

4. The integrated drive chain of claim 2, wherein, A sealing ring is arranged on the rotor of the generator, the sealing ring at least partially overlaps the isolation cover in the axial direction.

5. The integrated drive chain of claim 4, wherein, At least one side of the isolation cover is provided with the sealing ring.

6. The integrated drive chain of claim 5, wherein, An end face of the second end portion of the isolation cover is formed with a plug-in groove, and the rotor of the generator is provided with a sealing ring inserted into the plug-in groove.

7. The integrated drive chain of claim 4, wherein, The second end portion of the isolation cover is provided with a ring groove or a spiral groove.

8. The integrated drive chain of claim 2, wherein, The rotor of the generator comprises a hub transition flange, and the hub transition flange is provided with a ventilation hole for communicating the output shaft area with the outside.

9. The integrated drive chain of claim 1, wherein, The utility model relates to an integrated drive chain.

10. A wind power unit, characterized in that The integrated drive chain according to any one of claims 1-9. ​

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