Power generation assembly and wind generating set

Abstract

The utility model provides a power generation assembly and a wind generating set. The power generation assembly comprises a gear box and a power generation assembly, wherein the gear box comprises a box body, a gear train arranged in the box body and an output shaft connected with the gear train; the generator comprises a stator shell, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged in the stator shell, the rotor assembly is fixedly connected with the output shaft, and the stator shell of the generator is fixedly connected with the box body; the first current suppression path is used for suppressing current conduction between a stator assembly of the generator and the box body; and a second current suppression path for suppressing a current conducted from a rotor assembly of the generator to the output shaft. According to the power generation assembly, stray current can be effectively restrained, and a bearing and a tooth surface in a gearbox are protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, and more particularly, to a power generation assembly and a wind turbine generator. BACKGROUND

[0002] A wind turbine generator converts the wind energy captured by a rotor into kinetic energy, and converts the kinetic energy into electric energy by a generator. Since the rotational speed of the rotor is usually very low and cannot reach the required rotational speed for power generation, a speed increasing gearbox is usually arranged between the rotor and the generator. In order to improve the compactness of the unit, the generator and the gearbox are usually assembled into an integrated structure, the output shaft of the gearbox is connected with the rotor assembly of the generator, and the gearbox housing and the stator shell are connected with each other.

[0003] However, during the operation of the wind turbine generator, various stray currents are generated in the integrated power generation assembly. In addition to the low-frequency induced current generated during the operation of the generator due to rotor eccentricity, magnetic circuit imbalance and other reasons, there are also stray currents due to capacitive coupling and conductive coupling, which return to the converter through the cable, the stator assembly, the rotor assembly, the gearbox and finally the converter. Since the impedance between the output shaft of the gearbox and the bearing, and the gear and the gear ring of the gearbox is small, a small stray current can also generate a high effective current. If the stray current is too large, it is easy to cause the electrical erosion damage of the bearings, tooth surfaces and other components, affecting the service life of the gearbox. Therefore, how to inhibit and control the influence of the stray current in the integrated structure on the operation of the unit is a technical problem expected to be solved by those skilled in the art. UTILITY MODEL CONTENT

[0004] Therefore, the purpose of the present application is to provide a power generation assembly and a wind turbine generator to effectively inhibit the stray current in the power generation assembly and protect the bearings and other elements in the gearbox.

[0005] A power generation assembly is provided, which comprises: a gearbox comprising a housing, a gear train arranged in the housing, and an output shaft connected with the gear train; a generator comprising a stator shell, a stator assembly arranged in the stator shell, and a rotor assembly, the rotor assembly being fixedly connected with the output shaft, and the stator shell of the generator being fixedly connected with the housing; a first current inhibition path for inhibiting the conduction of current between the stator assembly of the generator and the housing; and a second current inhibition path for inhibiting the conduction of current from the rotor assembly of the generator to the output shaft.

[0006] According to an aspect of the present application, the power generation assembly comprises a first electrically insulating assembly arranged on the current conduction path between the stator housing and the box, the first electrically insulating assembly providing the first current suppression path, and / or the power generation assembly comprises a second electrically insulating assembly arranged between the stator housing and the stator assembly, the second electrically insulating assembly providing the first current suppression path.

[0007] According to an aspect of the present application, the first electrically insulating assembly is an adapter flange arranged between the box and the stator housing, the adapter flange being insulatively connected with one of the box and the stator housing.

[0008] According to an aspect of the present application, the adapter flange is annular, having a first hole and a second hole arranged at intervals in the circumferential direction, the first hole being a through hole, a first connecting member connecting the adapter flange with one of the box and the stator housing through the first hole, wherein a first insulating layer is arranged in the first hole so that the first connecting member is insulated from the adapter flange, and a second connecting member connects the other one of the box and the stator housing with the adapter flange in combination with the second hole.

[0009] According to an aspect of the present application, the adapter flange further comprises a second insulating layer and a third insulating layer, the second insulating layer being arranged on a first axial side of the adapter flange, and the third insulating layer being arranged on a second axial side of the adapter flange.

[0010] According to an aspect of the present application, the first insulating layer is an insulating sleeve arranged in the first hole, and the second insulating layer and the third insulating layer are respectively insulating gaskets.

[0011] According to an aspect of the present application, axial ends of the first insulating layer protrude relative to axial ends of the first hole, and the second insulating layer and the third insulating layer are respectively sleeved on an outer periphery of the first insulating layer.

[0012] According to an aspect of the present application, the first connecting member is connected with the stator housing through the first hole, and the second insulating layer is continuously extended in a ring shape or arranged at intervals in a plurality of ways along the circumferential direction of the adapter flange, so as to insulate and separate the adapter flange from the stator housing of the generator.

[0013] According to an aspect of the present application, a recess is formed on a side of the adapter flange facing the box and corresponding to the first hole, the third insulating layer is arranged in the recess, the first connecting member is a bolt, and the recess is used to accommodate a head of the first connecting member and maintain a gap between the head and the first connecting member.

[0014] According to an aspect of the present application, the sink groove is filled with an insulating sealing material, which covers the outer periphery of the bolt head.

[0015] According to an aspect of the present application, the second current suppression path comprises a first bypass conduction path, which conducts current between the rotor assembly of the generator and the case.

[0016] According to an aspect of the present application, the power generation assembly further comprises a first dynamic conduction device arranged between the rotor assembly of the generator and the case, which forms the first bypass conduction path.

[0017] According to an aspect of the present application, the first dynamic conduction device comprises a first brush arranged between the rotor assembly and the case, which comprises a first brush holder and brush hairs mounted on the brush holder, the first brush holder being mounted on the rotor assembly, and the brush hairs being in contact with the case.

[0018] According to an aspect of the present application, the first bypass conduction path further comprises a ring-shaped friction disc, which has a conductive function, is mounted on the case, faces the first brush, and is in contact with the brush hairs of the first brush.

[0019] According to an aspect of the present application, the power generation assembly further comprises a bearing and a sealing ring arranged between the output shaft and the case, the sealing ring being arranged between the bearing and the rotor assembly, the sealing ring comprising a conductive material to conduct current between the output shaft and the case, thereby constituting the first bypass conduction path.

[0020] According to an aspect of the present application, the rotor assembly comprises a rotor holder and a rotor mounted on the rotor holder, the rotor holder being connected to the output shaft, and the power generation assembly further comprises a third electrically insulating assembly arranged between the output shaft and the rotor, so that the output shaft and the rotor are electrically insulated, thereby the third electrically insulating assembly providing the second current suppression path.

[0021] According to an aspect of the present application, the rotor holder comprises a first rotor holder segment and a second rotor holder segment connected to each other, the first rotor holder segment being connected to the output shaft, and the second rotor holder segment being arranged at the outer periphery of the first rotor holder segment and supporting the rotor, and the third electrically insulating assembly is arranged at the connection between the first rotor holder segment and the second rotor holder segment, so that the first rotor holder segment and the second rotor holder segment are electrically insulated.

[0022] According to an aspect of the present application, the second current suppression path further comprises a second bypass conduction path, which allows current conduction between the rotor and the stator housing.

[0023] According to an aspect of the present application, the second bypass conduction path comprises a second brush connected between the rotor and the stator housing, which establishes a circuit conduction path between the rotor and the stator housing, and the second brush is arranged at the other end of the generator opposite to the gear box.

[0024] According to another aspect of the present application, a wind turbine generator set is provided, which comprises the power generation assembly and a blade wheel connected with the power generation assembly, and the gear box has an input shaft, and the blade wheel is connected with the input shaft.

[0025] Additional aspects and / or advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects and features of the present application will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a flow path of stray current in the integrated power generation assembly.

[0028] Figure 2 is a structural schematic diagram of the power generation assembly according to the embodiment of the present application.

[0029] Figure 3 is a three-dimensional structural schematic diagram of the adapter flange according to the embodiment of the present application.

[0030] Figure 4 is a sectional view of the connection between the adapter flange and the stator housing in the motor assembly according to the embodiment of the present application.

[0031] Figure 5 is a structural schematic diagram of the adapter flange provided with the first connecting member according to the embodiment of the present application.

[0032] Figure 6 is a sectional view of the connection between the adapter flange and the stator housing in the motor assembly according to the embodiment of the present application, after the insulating sealant is filled in the sink.

[0033] Figure 7 is a partial structural schematic diagram of the power generation assembly according to the embodiment of the present application.

[0034] Figure 8is a sectional view of the connection between the stator housing and the adapter flange of a power generation assembly according to an embodiment of the present application.

[0035] Figure 9 is a sectional view of the connection between the gear box and the adapter flange of a power generation assembly according to an embodiment of the present application.

[0036] Figure 10 is a structural schematic diagram of a power generation assembly according to another embodiment of the present application.

[0037] Legend of reference signs:

[0038] 100 - generator; 100 - gear box;

[0039] 100 - gear box; 110 - housing; 120 - gear train; 130 - rotating shaft;

[0040] 200 - generator; 210 - stator housing; 220 - stator assembly; 230 - rotor assembly;

[0041] 30 - first electrically insulated assembly; 300 - current transformer;

[0042] 40 - first dynamic electrically conductive device; 400 - adapter flange; 410 - first hole;

[0043] 420 - first connecting member; 421 - screw; 422 - bolt head;

[0044] 423 - gasket; 430 - insulating layer; 431 - first insulating layer;

[0045] 432 - second insulating layer; 433 - third insulating layer; 440 - sink;

[0046] 442 - insulating sealant; 450 - second hole; 460 - second connecting member;

[0047] 470 - annular flange; 472 - insulating material; 50 - third electrically insulated assembly;

[0048] 60 - second dynamic electrically conductive device. DETAILED DESCRIPTION

[0049] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and thus particular embodiments described herein are not intended as being limiting as there are many different ways to implement the methods, apparatuses, and / or systems described herein. For example, the order in which operations are described is not intended to be limiting unless otherwise specified. Moreover, descriptions of features in terms of being performed in serial order are not intended to be limiting as parallel order can be possible unless specifically stated otherwise. Additionally, descriptions of features in terms of being performed or produced by a single device can be intended to be implemented by a single device, or by a single set of devices, unless otherwise specified.

[0050] The features described herein can be implemented in different ways depending upon the particular application, the explicit teaching provided herein, and / or the implicit understanding of those skilled in the relevant art(s). Various modifications and changes can be made thereto without departing from the spirit and scope of the description, which is to be understood from the scope of the appended claims.

[0051] As used herein, the term “and / or” includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0052] Although terms such as “first,” “second,” and “third” can be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the first element, the first component, the first region, the first layer, or the first section referred to in the examples described herein can also be referred to as the second element, the second component, the second region, the second layer, or the second section without departing from the teachings of the examples.

[0053] In the description, when an element such as a layer, a region, or a substrate is referred to as being “on” another element, “connected to” or “coupled to” another element, it can be directly on the other element, directly connected to or coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being “directly on” another element, “directly connected to” or “directly coupled to” another element, there are no other elements interposed therebetween.

[0054] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" are meant to be interpreted inclusively rather than exclusively, unless otherwise indicated by context. The term "plurality" means any number, including two and more.

[0055] The terms "upper", "lower", "top", "bottom", etc. are defined based on the orientation of the product in the normal use state, unless otherwise specified.

[0056] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs when read in light of the present application. Unless otherwise explicitly defined herein, terms such as, for example, terms commonly defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present application, and should not be interpreted in an idealized or overly formal sense.

[0057] Figure 1 A structural diagram of a power generation assembly is shown, in which a gear box and a generator are integrated into a structure. The integrated structure includes a gear box 100 and a generator 200 connected to each other. The input shaft of the gear box 100 is used to connect with the impeller of the wind turbine generator set, and the kinetic energy is transmitted to the output shaft 130 of the gear box 100 through the gear train 120 arranged in the box body 110 of the gear box 100. The generator 200 includes a generator housing 210, a stator assembly 220 arranged in the generator housing 210, and a rotor assembly 230 arranged inside the stator assembly 220, the rotor assembly 230 is connected with the output shaft 130 of the gear box 100. The generator housing 210 is fixedly connected with the rear end of the box body 110 of the gear box 100. The output shaft 130 of the gear box 100 is supported by the bearing arranged in the box body 110 of the gear box 100. In the integrated power generation assembly, the rotor assembly 230 is usually rigidly connected with the output shaft of the gear box, so that the rotor assembly 220 is supported by the bearing in the gear box 100. The PWM converter is connected with the stator assembly of the generator, and drives and controls the generator 200.

[0058] The inventors of the present application have found that in such an integrated power generation assembly, there are mainly two stray current paths, as shown in Figure 1 Path A and Path B, respectively.

[0059] Path A is a high-frequency current path. The converter 300 supplies power to the stator side of the generator, and switches the DC bus voltage (VDC) to the three-phase terminals of the generator 200 in a switching mode, thereby generating a high-frequency component voltage. The high-frequency component voltage generates a high-frequency current between the ground circuit or between the low potential. As shown in FIG. 3, Figure 1 As shown in FIG. 3, a part of the high-frequency current passes through the stator housing 210 of the generator 200 along path A1, is grounded, and returns to the converter 300. Another part of the high-frequency current passes through the stator housing 210 of the generator 200 along path A2, is transmitted to the housing 110 of the gear box 100, and is further divided into two parts. One part of the current passes through the housing 110 of the gear box 100 along path A21, is grounded, and returns to the converter 300. The other part of the current enters the gear box 100 along path A22, flows through the gear teeth and bearings of the gear box 100, and causes the bearings and gear teeth of the gear box 100 to have a risk of electric corrosion.

[0060] In the generator, a low-frequency shaft current is generated due to the asymmetry of the motor structure or material characteristics. The shaft current passes through the rotating part of the gear box 100 from the rotating shaft of the generator 200 along path B, reaches the non-rotating part (the housing) of the gear box 100 through the bearings or the gear teeth of the gear box, and then flows out of the entire device through the ground circuit. The current or the current generated by the voltage breakdown flowing through the bearings and the gear teeth of the gear box has a risk of damaging the bearings and the gear teeth, and thus needs to be reduced as much as possible. However, when the current generated in path B is reduced to a predetermined value, the value of the current is related to the contact area of the bearings and the gear teeth, and the oil film, the oil state, the load state, the vibration state, the temperature, and the like have a dynamic effect,

[0061] The inventors of the present application have found, in the process of researching the gear box and generator integrated structure, that a large fluctuation in potential difference occurs in the gear box 100, and sometimes the absolute value of the amplitude is A+B, and sometimes the absolute value of A-B. The fluctuation range is larger than that of path A alone or path B alone. In this case, the risk of electric corrosion of the bearings and the gear teeth in the gear box 100 is multiplied. Therefore, the inventors of the present application believe that the effectiveness of the engineering scheme cannot be achieved by simply constraining the theoretical value, and it is more ideal to be able to consider suppressing the stray current in different paths.

[0062] In order to block the high-frequency current path A from the stator assembly 220 to the gearbox 100 and the shaft current path B from the rotor assembly 230 to the gearbox 100 through the output shaft 130, according to an aspect of the embodiments of the present application, a first current suppression path and a second current suppression path are provided in the generator assembly. The first current suppression path is used to suppress the current conduction between the stator housing 210 of the generator 100 and the case 110 of the gearbox 100. The second current suppression path is used to suppress the current conduction from the rotor assembly 230 of the generator 200 to the output shaft 130.

[0063] As an embodiment of the present application, a first electrically insulating assembly 30 can be provided on the current conduction path between the case 110 of the gearbox 100 and the stator housing 210 of the generator 200, and the first current suppression path is provided by the first electrically insulating assembly 30. In addition, a second electrically insulating assembly can also be provided between the stator assembly 220 and the stator housing 210, and the current conduction between the stator housing 210 and the stator assembly 220 of the generator is blocked by the second electrically insulating assembly, thereby providing the first current suppression path by the second electrically insulating assembly. The first electrically insulating assembly 30 and the second electrically insulating assembly can be used alternatively or simultaneously, thereby obtaining a better effect of suppressing high-frequency current.

[0064] As shown in Figure 2 The first electrically insulating assembly 30 is provided between the case 110 of the gearbox 100 and the stator housing 210 of the generator 200, and is used to block the high-frequency current path between the stator housing 210 of the generator 200 and the case 110 of the gearbox 100. The first electrically insulating assembly 30 can be an insulating component provided between the case 110 of the gearbox 100 and the stator housing 210 of the generator 200, so that the stator housing 210 and the case 110 of the gearbox 100 are electrically insulated. By the first electrically insulating assembly 30, the path of the high-frequency circulating current is changed, and the current conduction from the stator housing 210 to the case 110 of the gearbox 100 through the insulation capacitor between the stator assembly 220 and the stator housing 210 of the inverter 300 is avoided.

[0065] According to an aspect of the embodiments of the present application, the first electrically insulating assembly 30 can be an insulating flange, which can be integrated on the flange of the side of the stator housing 210 facing the gearbox 100 or integrated on the flange at the rear end of the case 110 of the gearbox 100. While connecting the stator housing 210 of the generator 200 and the rear end of the case 110 of the gearbox 100, the current conduction path therebetween is also blocked.

[0066] As shown in Figure 2As shown, in order to support the gear train 120 in the gear box 100, the power generation assembly includes a bearing 140, which is arranged between the box 110 and the output shaft 130. As shown in the figure, the bearing 140 is arranged between the output shaft 130 and the rear end of the box 110. Figure 10 As shown, the box 110 has a rotating shaft support portion 1101, which is formed in a cylindrical shape as a bearing seat for mounting and supporting the bearing 140, the output shaft 130 is located in the rotating shaft support portion 1101, and the bearing 140 is arranged between the output shaft 130 and the rotating shaft support portion 1101 to rotatably support the output shaft 130. According to the embodiment of the present application, in the case of electrically insulating the stator housing 210 from the box 110 of the gear box 100, the high-frequency circulating current applied to the stator assembly 220 by the converter 300 can flow back to the grounding circuit of the converter 300 through the grounding wire of the stator housing 210 (current path A1), thereby avoiding the high-frequency circulating current from entering the gear box 100, so that the gear surfaces and the bearing 140 in the gear box 100 are effectively protected.

[0067] According to one embodiment of the present application, the first electrically insulating assembly 30 is an insulating flange, and more specifically, one embodiment of the present application provides a transition flange plate 400 for connecting between the box 110 of the gear box 100 and the stator housing 210 of the generator 200 to achieve an insulating connection therebetween. The axial first side of the transition flange plate 400 faces the generator 200, and the axial second side of the transition flange plate 400 faces the gear box 100.

[0068] The transition flange plate 400 can be integrated on the connecting flange on the side of the stator housing 210 of the generator 200 facing the gear box 100 or on the connecting flange at the rear end of the box 110 of the gear box 100. While connecting the stator housing 210 of the generator 200 with the rear end of the box 110 of the gear box 100, the current conduction path therebetween is also blocked.

[0069] In the following embodiments, the transition flange plate 400 integrated on the stator housing 210 of the generator 200 is taken as an example for detailed description. However, the connection mode of the transition flange plate 400 of the present application is not limited thereto, and the following description can be applied to the case where the transition flange plate 400 is integrated on the box 110 of the gear box 100.

[0070] Figure 3 is a perspective structural schematic view of the transition flange plate according to the embodiment of the present application. Figure 4 is a sectional view of the connection between the transition flange plate and the stator housing in the motor assembly according to the embodiment of the present application. Figure 5 is a perspective view of the first connecting member arranged on the transition flange plate.

[0071] As shown in the figure, the transition flange plate 400 is arranged between the stator housing 210 of the generator 200 and the box 110 of the gear box 100, and the transition flange plate 400 is arranged between the stator housing 210 of the generator 200 and the box 110 of the gear box 100 to achieve an insulating connection therebetween. Figure 3As shown, the transition flange 400 is generally annular and has multiple first holes 410 and multiple second holes 450, which are spaced apart circumferentially on the transition flange 400. The first holes 410 are through holes used to connect the transition flange 400 to the stator housing 210 via a first connector 420. The second holes 450 are used to connect the transition flange 400 to the gearbox 100 housing 110 via a second connector 460. A first insulating layer 431 is provided on the inner wall of the first hole 410, providing insulation between the transition flange 400, the first connector 420, and the stator housing 210.

[0072] like Figure 4 As shown, a first insulating layer 431 is disposed on the radial inner circumferential surface of the first hole 410, thereby insulatingly separating the inner circumferential surface of the first hole 410 from the outer circumferential surface of the first connector 420. The first connector 420 can be inserted into the first hole 410 from the second side of the adapter flange 400 and can extend from the first side of the adapter flange 400 to connect with the stator housing 210, thereby mounting the adapter flange 400 on the generator 200. Since the first connector 420 and the adapter flange 400 are insulated from each other by the first insulating layer 431, an insulated connection can be achieved between the adapter flange 400 and the generator 200. Furthermore, since the transition flange 400 is provided with a first hole 410 and a second hole 450, and the first hole 410 is provided with an insulating layer, the transition flange 400 has two types of connection holes. One type of connection hole (such as the first hole) is used to be provided with an insulating structure for connection with the first component, and the other type of connection hole (such as the second hole) is provided with an insulating structure or not provided with an insulating structure. Both can make the first component and the second component insulated through the transition flange, thereby making the insulating connection between the first component and the second component simpler.

[0073] Furthermore, a second insulating layer 432 is provided on the first axial side of the transition flange 400 to insulate the stator housing 210 from the transition flange 400. The second insulating layer 432 can extend continuously in a ring shape along the circumference of the transition flange 400, or it can be provided at multiple intervals along the circumference of the transition flange 400, as long as it can insulate the stator housing 210 from the second side of the transition flange 400. The second insulating layer 432 can be fixedly provided on the second side of the transition flange 400, or it can be a separate component placed on the first side of the transition flange 400 during the installation of the transition flange 400 on the generator 200.

[0074] According to one embodiment of this application, a third insulating layer 433 is further provided on the axial second side surface of the adapter flange 400 at a position corresponding to the first hole 410. By providing the third insulating layer 433, the insulation effect between the adapter flange 400 and the first connecting member 420 can be further improved. The third insulating layer 433 can be fixedly provided on the second side surface of the adapter flange 400, or it can be provided as an independent component and placed on the second side surface of the adapter flange 400 during the installation of the adapter flange 400 on the generator 200.

[0075] According to one embodiment of this application, the first connector 420 can be a bolt, and the bolt head 422 of the first connector 420 is located on the second side of the adapter flange 400. Since a third insulating layer 433 is also provided on the second side of the adapter flange 400 corresponding to the first hole 410, the bolt head 422 can be insulated from the second side of the adapter flange 400, thereby ensuring that the first connector 420 is insulated from the adapter flange 400 as a whole.

[0076] The first insulating layer 431 can be an insulating material coated on the inner surface of the first hole 410, or it can be an insulating sleeve that is pasted or embedded in the first hole 410. The second insulating layer 432 and the third insulating layer 433 can be insulating materials coated on the first side and the second side of the transition flange 400, respectively, such as insulating resin. The second insulating layer 432 and the third insulating layer 433 can also be insulating gaskets pasted on the first side and the second side, for example, laminated products formed by laminating multiple insulating sheets.

[0077] like Figure 4 As shown, according to one embodiment of this application, the two ends of the first insulating layer 431 protrude relative to the axial ends of the first hole 410, and the second insulating layer 432 and the third insulating layer 433 are sleeved on the outer periphery of the first insulating layer 431. For example, the second insulating layer 432 and the third insulating layer 433 are provided with through holes corresponding to the first insulating layer 431, and the inner peripheral surface of the through hole is in contact with or clearance fits the outer peripheral surface of the first insulating layer, thereby forming an insulating layer 430. The insulating layer 430 can cover the inner surface of the first hole 410 and cover at least the first side and the second side of the transition flange 400 located at the first hole 410, thereby ensuring that the first connector 420 is insulated from the transition flange 400.

[0078] Before the first insulating layer 431, the second insulating layer 432 and the third insulating layer 433 are bonded to the transition flange 400, insulating material, such as insulating varnish, may be applied to the inner surface of the first hole 410, the first side and the second side of the transition flange 400.

[0079] Since the end opening of the first hole 410 has a corner and the adapter flange 400 is usually made of metal, a sharp-end discharge will occur at the opening of the first hole 410. In the case that there is a gap between the first insulating layer 431 and the second insulating layer 432 or the third insulating layer 433, the gap can become a creeping path of the sharp-end discharge, and the current can flow along the gap to the first connecting piece 420, affecting the insulation performance between the adapter flange 400 and the stator housing 210.

[0080] However, according to one preferred embodiment of the present application, by protruding the axial two ends of the first insulating layer 431 relative to the axial two ends of the first hole 410, the creeping distance is made larger, and the possibility of electrical conduction between the adapter flange 400 and the stator housing 210 can be reduced. Usually, the voltage of the sharp-end discharge is twice the applied voltage, and a larger voltage is used in the voltage withstand test. If a voltage of 1000V is applied to the adapter flange 400 in the voltage withstand test, a voltage of 2000V will be applied at the sharp end. The sharp-end discharge will be transmitted from the axial end of the first insulating layer 431 to the first connecting piece 420 radially inward, damaging the insulation between the adapter flange 400 and the first connecting piece 420. By extending the axial length of the first insulating layer 431, the axial end of the first insulating layer 431 exceeds the opening of the first hole 410 by a predetermined length, a longer creeping distance can be obtained, the possibility of creeping can be eliminated, and the insulation performance of the connection of the first connecting piece 420 can be ensured. Of course, in other embodiments, in order to obtain a longer creeping distance as much as possible, the first insulating layer and the second insulating layer can also partially overlap in the radial direction of the first hole; or the first insulating layer and the third insulating layer partially overlap.

[0081] According to one embodiment of the present application, in order to avoid damaging the insulating layer during the screwing process of the first connecting piece 420, the first hole 410 can be provided as a through hole, and the part of the screw rod 421 of the first connecting piece 420 that cooperates with the first hole 410 is not provided with external threads, and only the part of the screw rod 421 that is combined with the stator housing 210 of the generator 200 is provided with external threads to be screwed with the stator housing 210.

[0082] In the case of installing the adapter flange 400 on the stator housing 210 of the generator 200, the first hole 410 can be aligned with the connecting hole on the stator housing 210, and then the first connecting piece 420 is inserted into the first hole 410 and combined with the connecting hole on the stator housing 210, thereby installing the adapter flange 400 on the stator housing 210 of the generator 200.

[0083] In addition, in order to prevent the first connecting member 420 from loosening, a gasket 423 can also be arranged inside the bolt head 422 of the first connecting member 420, which can be an anti-rotation gasket or the like, and no specific limitation is made herein. In addition, the gasket 423 can also be made of an insulating material. The gasket 423 made of an insulating material can replace the third insulating layer 433 and strengthen the insulating effect of the third insulating layer 433.

[0084] According to an embodiment of the present application, a recess 440 is formed at a position corresponding to the first hole 410 on the axial second side of the adapter flange 400, and the bolt head 422 of the first connecting member 420 can be accommodated in the recess 440 and kept a certain gap with the inner side wall of the recess 440, so as to prevent the bolt head 422 from being in electrical conduction with the side wall of the recess 440. In addition, in order to facilitate the installation or dismounting of the first connecting member 420, the recess 440 can penetrate through the outer peripheral surface of the adapter flange 400.

[0085] Figure 5 A structure schematic view of the first connecting member 420 installed in the first hole 410 is shown. As shown in the figure, Figure 5 the depth of the recess 440 can be set to be greater than the height of the bolt head 422 of the first connecting member 420 after being tightened, so that the bolt head 422 can be completely located in the recess 440 and can have a certain distance with the second side of the adapter flange 400, avoiding protruding from the axial second side of the adapter flange 400 and affecting the distance between the adapter flange 400 and the gear box 100, so as to improve the structural compactness after the gear box and the generator are installed, and ensure the insulating gap between the first connecting member 420 and the box body 110 of the gear box 100.

[0086] According to an embodiment of the present application, the recess 440 is set to be circular-shaped with the bolt head 422, and the inner diameter size of the recess 440 is greater than the outer diameter size of the bolt head 422. In the case where the gasket 423 is arranged, the inner diameter size of the recess 440 is greater than the outer diameter size of the gasket 423, so as to keep a safe gap between the radial inner side wall of the recess 440 and the bolt head 422, avoiding the contact between the bolt head 422 and the recess 440 and preventing the electrical conduction therebetween. In addition, the inner surface of the recess 440 can be coated with a fourth insulating layer (such as insulating paint), and a fifth insulating layer (such as insulating paper) is further applied on the surface of the fourth insulating layer, so as to reinforce the insulating effect.

[0087] To further ensure insulation between the first connector 420 and the transition flange 400, insulating sealant 442 can be filled into the recess 440 after the transition flange 400 is connected to the stator housing 210. Specifically, after the transition flange 400 is installed onto the stator housing 210 of the generator 200, a U-shaped gap with a U-shaped cross-section is formed around the outer surface of the bolt head 422. According to an embodiment of this application, sealant 442 is filled into this U-shaped gap.

[0088] As an example, a silicone resin that cures at room temperature can be used to pot the gap between the bolt head 422 and the groove 440. The insulating sealant 442 can cover the outer periphery of the bolt head 422 and fill gaps at the connection. By potting the insulating sealant 442, insulation between the first connector 420 and the transition flange 400 can be further ensured, and moisture, foreign matter, etc., can be prevented from entering the first hole 410 and from entering the interior of the generator 200 through gaps.

[0089] Furthermore, the axial end face of the bolt head 422 has a predetermined gap with the surface of the axial second side of the transition flange 400, and the insulating sealant 442 is also provided on the axial end face of the bolt head 422.

[0090] When the generator 200 with the adapter flange 400 is connected to the gearbox 100, the axial end face of the bolt head 422 is close to the housing 110 of the gearbox 100, posing a risk of discharge and leakage between the housing 110 and the first connector 420. Since there is no insulation between the first connector 420 and the stator housing 210 of the generator 200, if there is electrical conductivity between the housing 110 of the gearbox 100 and the first connector 420, there will also be electrical conductivity between the housing 110 of the gearbox 100 and the stator housing 210, thus forming a high-frequency current leakage path. However, according to the embodiment of this application, since an insulating sealant 442 is also provided on the axial end face of the bolt head 422, discharge between the first connector 420 and the housing 110 of the gearbox 100 can be prevented.

[0091] like Figure 4 As shown, an annular flange 470 is also formed on the first axial side of the transition flange 400. The annular flange 470 extends axially from the axial end face of the transition flange 400, extending a predetermined length relative to the end of the first hole 410, thereby forming a stop on the radially inner side of the stator housing 210. By providing the annular flange 470, it is helpful to align the transition flange 400 on the stator housing 210 and to prevent the transition flange 400 from moving or misaligning relative to the stator housing 210 in the radial direction perpendicular to the transition flange 400.

[0092] In order to avoid the adapter flange 400 from contacting the stator housing 210 to cause electrical conduction, a predetermined gap is provided between the radially outer side of the annular flange 470 and the radially inner side of the stator housing 210. Further, in order to ensure the insulation between the two, an insulating material 472 is applied between the radially outer side of the annular flange 470 and the radially inner side of the housing. Generally, the insulating material 472 is provided on the annular flange 470 for the sake of convenience of operation, so as to form an insulating stopper on the side of the adapter flange 400 facing the generator.

[0093] As an example, an insulating tape, for example, a tape of non-woven fabric, can be wound on the outer circumferential surface of the annular flange 470. The tape of non-woven fabric, also known as tape of non-alkali glass fiber, has good flexibility, excellent insulating performance and mechanical strength, and has excellent properties such as high strength, impact resistance, high modulus, low elongation, no magnetic hysteresis and no eddy current loss. By winding the tape of non-woven fabric, the thickness of the winding can be more flexibly adjusted, and in the case of ensuring insulation isolation, the alignment and installation operation of the adapter flange 400 and the stator housing 210 can be avoided.

[0094] According to an embodiment of the present application, the second holes 450 are threaded holes arranged at intervals in the circumferential direction of the adapter flange 400. Preferably, the second holes 450 are arranged alternately with the first holes 410. The housing 110 of the gear box 100 is provided with connecting holes capable of being aligned with the second holes 450, and the housing 110 can be connected to the adapter flange 400 by using the second connecting members 460, so as to realize the connection between the gear box 100, the adapter flange 400 and the generator 200.

[0095] According to an embodiment of the present application, the second holes 450 can be through holes penetrating the adapter flange 400, and by selecting a second connecting member 460 with a suitable length, the second connecting member 460 can be prevented from protruding out of the axially first side of the adapter flange 400. As an optional example, the second holes 450 can also be blind holes with openings on the side facing the gear box 100. By providing the second holes 450 as blind holes, external water vapor or dust can be prevented from entering the second holes 450 from the axially first side of the adapter flange 400.

[0096] According to an embodiment of the present application, the adapter flange 400, the first connecting member 420 and the second connecting member 460 can all be made of metal materials to improve the structural strength. Since the adapter flange 400 is connected to the stator housing 210 of the generator 200 in an insulated manner, even if the housing 110 of the gear box 100 is electrically conductive with the adapter flange 400, the insulation between the housing of the gear box 100 and the stator housing 210 of the generator 200 is not affected, so that the high-frequency current flowing from the stator assembly 220 to the housing of the gear box can be effectively suppressed.

[0097] According to an aspect of the present embodiment of the present application, the second current suppression path is arranged between the rotor assembly 230 of the generator 200 and the case 110 of the gear box 100, and comprises a first bypass conduction path arranged between the rotor of the generator 200 and the case 110 of the gear box 100, which is capable of conducting the low-frequency induced current in the generator 200 to the case 110 of the gear box 100 and grounding through the grounding circuit on the case 110 of the gear box 100.

[0098] According to an embodiment of the present application, as shown in Figure 2 the first bypass conduction path is formed by a first dynamic conductive device 40 arranged between the rotor of the generator and the case 110 of the gear box 100, which is capable of bypassing the induced current path and equalizing the electric potential between the rotating body in the generator 200 and the case 110 of the gear box 100, so that the induced current is directly conducted from the rotor assembly 230 to the case 110 of the gear box 100 (i.e., flows along the path B1 as shown in the figure), avoiding the current flowing through the gear train 120 inside the gear box 100. Figure 2

[0099] ​As an example, the first dynamic conductive device 40 is a brush, referred to here as the first brush, which enables a current conduction path to be formed between the rotor assembly 230 and the housing 110 of the gearbox 100. The induced current generated in the generator 200 is conducted to the housing 110 of the gearbox 100 through this path, and then returns to the converter 300 through the grounding path of the housing 110 of the gearbox 100, forming a closed loop. Since the low-frequency induced current generated in the generator 200 is directly transmitted to the housing 110 of the gearbox 100 through the current bypass path, without flowing through the bearings and tooth surfaces in the gearbox 100, damage to the bearings and tooth surfaces can be avoided. As an example, when both the first current suppression path and the second current suppression path are provided, the first electrical insulation assembly 30 and the first dynamic conductive device 40 are provided simultaneously. Because the first dynamic conductive device 40 forms a first bypass conduction path, the rotor assembly 230 of the generator 200, the rotating body in the gearbox 100, and the housing 110 of the gearbox 100 are all at essentially the same low potential. Furthermore, the low-frequency induced current generated in the stator assembly 230 can be conducted to the housing 110 through the current bypass path. This can form a closed loop through the grounding of the housing 110 and the grounding of the converter 300, preventing current from flowing through the bearing 140. Through the first electrical insulation component 30, the high potential of the stator housing 210 and the stator assembly 220 can be isolated from the low potential of the gearbox 100. Since the stator housing 210 is connected to the grounding circuit, high-frequency current can be introduced into the grounding circuit. Therefore, even if the potential of the stator assembly 220 is high, high-frequency current can be prevented from being introduced into the gearbox 100, and consequently, from being introduced into the gear train 120 from the housing 110 of the gearbox. Therefore, the protection circuit system of the power generation device of this application, formed by setting the first current suppression path and the second current suppression path, can more effectively protect the bearing at the output end of the gearbox and the tooth surface on the output side of the gear system, thereby improving the overall reliability of the power generation device.

[0100] like Figure 2 As shown, according to one embodiment of this application, the first brush can be mounted on the rotor assembly 230 of the generator 200. The rotor assembly 230 includes a rotor bracket and a rotor mounted on the rotor bracket, which is mounted on the output shaft 130 of the gearbox 100. The bracket of the first brush can be mounted on the rotor bracket, and the bristles of the first brush contact the housing 110 of the gearbox 100. Mounting the first brush on the generator facilitates the installation, maintenance, or replacement of the first brush. As an example, the first brush can be first mounted on an adapter plate, and then the adapter plate can be mounted on the rotor bracket of the generator. During installation or replacement, the operator can directly access the adapter plate through the inner cavity of the generator 200 to install or remove the adapter plate as a whole, which is more convenient for maintenance and replacement compared to mounting the brush on the housing 110 of the gearbox 100.

[0101] According to one embodiment of the present application, the brush can adopt a carbon fiber brush, by selecting a fiber with appropriate stiffness, so that the fiber can be pierced to achieve normal conduction as a conductive bypass under oil mist.

[0102] According to one embodiment of the present application, the first bypass conduction path can further include a ring-shaped friction disc having a conductive function, installed on the side of the gearbox 100 facing the generator 200, facing the first brush, and the bristles of the first brush are in contact with the friction disc. During the operation of the generator assembly, the first brush is always in contact with the friction disc and is conductive, and the low-frequency induced current generated in the generator 200 can flow through the rotor support, the first brush, the friction disc, the box body 110, and then flow into the ground circuit, thereby bypassing the current around the rotating body in the gearbox 100, avoiding the current flowing through the bearing and the tooth surface.

[0103] According to one embodiment of the present application, the generator assembly further comprises a sealing ring 150, and the first bypass conduction path is formed by the sealing ring 150. As shown in Figure 10 The sealing ring 150 is arranged between the box body 110 and the output shaft 130, more specifically, arranged between the shaft support part 1101 and the output shaft 130 in parallel with the bearing 140, and located on the side of the bearing 140 facing the rotor assembly 130. The bearing accommodating cavity formed between the shaft support part 110 and the output shaft 130 is provided with lubricating grease to lubricate the output shaft 130 and the bearing 140, and the sealing ring 150 can seal the lubricating grease. The sealing ring 150 can be installed on the shaft support part 1101 and maintain dynamic sealing between the output shaft 130. The sealing ring 150 contains a conductive material, so as to form a current conduction path between the output shaft 130 and the shaft support part 1101, and the current conducted from the rotor assembly 230 to the output shaft 130 can be conducted to the box body 110 through the sealing ring 150, and then returned to the converter 300 through the grounding path of the box body 110, forming a closed loop. Since the low-frequency induced current generated in the generator 200 is directly transmitted to the box body 110 of the gearbox 100 through the bypass path formed by the conductive sealing ring 150, without flowing through the bearing and tooth surface in the gearbox 100, damage to the bearing and tooth surface can be avoided. In order to form a bypass conduction path through the sealing ring 150, the dynamic impedance of the sealing ring 150 is smaller than the dynamic impedance of the bearing 140. By forming a current conduction path through the sealing ring 150, the sealing grease function is achieved while protecting the bearing 140, and installation is convenient and does not occupy space.

[0104] According to the embodiments of the present application, the first bypass conduction path can be formed by the first dynamic conductive device 40 or the sealing ring 150 as described above, or the first dynamic conductive device 40 and the sealing ring 150 can be used simultaneously to form the first bypass conduction path as the second current suppression path.

[0105] According to the embodiments of the present application, as shown in Figure 10 the second current suppression path can be provided by a third electrically insulating component 50 arranged between the output shaft 130 and the rotor assembly 230 so as to electrically insulate the output shaft 130 and the rotor assembly 230.

[0106] As an example, the rotor support 231 includes a first rotor support section connected with the output shaft 130 and a second rotor support section arranged at the outer periphery of the first rotor support section and supporting the rotor 232, and the third electrically insulating component 50 is arranged at the connection between the first rotor support section and the second rotor support section so as to electrically insulate the first rotor support section and the second rotor support section.

[0107] By arranging the third electrically insulating component 50, a high impedance is provided between the main body of the rotor assembly 230 and the output shaft 130 of the gearbox 100, so that the conductive current is blocked and the low-frequency induced current generated in the rotor is difficult to conduct to the output shaft.

[0108] According to an aspect of the embodiments of the present application, the second current suppression path further includes a second bypass conduction path, and the second bypass conduction path can conduct current between the rotor assembly 230 and the stator housing 210. In the case where the third electrically insulating component 50 is arranged, the low-frequency induced current generated in the rotor assembly 230 can be conducted to the stator housing 210 through the second bypass conduction path, so as to be connected with the grounding circuit.

[0109] As shown in Figure 10 As an example, a second dynamic conductive device 60 can also be arranged between the rotor assembly 230 and the stator housing 210 to form the second bypass conduction path. The second dynamic conductive device 60 includes a second brush connected between the rotor assembly 230 and the stator housing 210, so as to establish a circuit conduction path between the rotor assembly 230 and the stator housing 210. As an optional example, the second brush is arranged at the other end of the generator 200 opposite to the gearbox 100, so as to facilitate installation and maintenance.

[0110] Generally, a hollow shaft sleeve extending along the axial direction of the generator is arranged on the rotor support, and the staff can pass through the shaft sleeve to the generator set to maintain the gear box 100. The stator housing 210 can be provided with a second brush mounting support, and the second brush is mounted on the second brush mounting support. The bristles of the second brush can be in frictional contact with the inner side wall of the shaft sleeve.

[0111] Due to the arrangement of the third electrically insulated component, the generator rotor and the gear box are isolated from each other, so that only a small part of the low-frequency induced current generated in the generator enters the gear box. In this case, the first bypass conduction path can not be provided.

[0112] According to the embodiments of the present application, when the first current suppression path is provided, the second current suppression path can also be provided at the same time to effectively isolate the stray current and the rotating body in the gear box. For example, when the first current suppression path (for example, the first electrically insulated component and / or the second electrically insulated component) is arranged in the generator assembly, the third electrically insulated component, the first brush and the second brush, etc. can also be arranged to simultaneously suppress the low-frequency induced current and the high-frequency induced current. The second current suppression path can be applied in one or more of a plurality of forms in combination with the first current suppression path. For example, the first electrically insulated component (and / or the second electrically insulated component) and the first bypass conduction path are combined with each other, the first electrically insulated component (and / or the second electrically insulated component), the third electrically insulated component and the second bypass conduction path are combined with each other, and the first electrically insulated component (and / or the second electrically insulated component), the first bypass conduction path, the third electrically insulated component and the second bypass conduction path are combined with each other. The arrangement mode of the current suppression path of the present application is not limited to the above examples, and those skilled in the art can make other combinations or modifications according to the embodiments of the present application.

[0113] According to the generator assembly of the embodiments of the present application, the housing of the gear box and / or the stator housing of the generator can be configured to be connectable with a grounding circuit, for example, a grounding wire connection point is arranged on the housing of the gear box and / or the stator housing of the generator to facilitate connection with the grounding wire. However, according to the embodiments of the present application, the grounding point can also not be provided in advance on the housing of the gear box and / or the stator housing of the generator, but a grounding connection point is machined on the housing of the gear box and / or the stator housing of the generator before being connected with the grounding wire during the installation of the generator assembly.

[0114] According to the embodiments of the present application, a wind turbine generator set is also provided, which comprises the above-mentioned generator assembly and an impeller connected with the generator assembly. The gear box has an input shaft, the impeller is connected with the input shaft, kinetic energy obtained by capturing wind energy is transmitted to the gear box, and then transmitted to the rotor of the generator after being speeded up by the gear box, so as to convert the kinetic energy into electrical energy by the generator.

[0115] Although the specific details of the embodiments of the present application have been described with reference to the accompanying drawings, the scope of protection of the present application is not limited by the description, and those skilled in the art can make corresponding modifications and variations without departing from the principles of the present application, and the modifications and variations will fall within the scope of protection of the present application.

Claims

1. A power generation assembly, characterized by, The power generation assembly comprises: a gearbox (100) comprising a gearbox housing (110), a gear train (120) arranged in the gearbox housing (110), and an output shaft (130) connected to the gear train (120); a generator (200) comprising a stator housing (210), a stator assembly (220) arranged in the stator housing (210), and a rotor assembly (230) fixedly connected to the output shaft (130), the stator housing (210) of the generator (200) being fixedly connected to the gearbox housing (110); a first current suppression path for suppressing current conduction between the stator assembly (220) of the generator (200) and the gearbox housing (110); a second current suppression path for suppressing current conduction from the rotor assembly (230) of the generator (200) to the output shaft (130).

2. The power generation assembly of claim 1, wherein, The power generation assembly comprises a first electrical insulation assembly arranged on a current conduction path between the stator housing (210) and the gearbox housing (110), the first electrical insulation assembly providing the first current suppression path, and / or The power generation assembly comprises a second electrical insulation assembly arranged between the stator housing (210) and the stator assembly (220), the second electrical insulation assembly providing the first current suppression path.

3. The power generation assembly of claim 2, wherein, The first electrical insulation assembly is an adapter flange (400) arranged between the gearbox housing (110) and the stator housing (210), the adapter flange (400) being insulatively connected to one of the gearbox housing (110) and the stator housing (210).

4. The power generation assembly of claim 3, wherein, The adapter flange (400) is annular, has a first hole (410) and a second hole (450) arranged at intervals in the circumferential direction, the first hole (410) is a through hole, a first connecting member (420) passes through the first hole (410) to connect the adapter flange (400) to one of the gearbox housing (110) and the stator housing (210), wherein a first insulation layer (431) is arranged in the first hole (410), so that the first connecting member is insulated from the adapter flange (400), a second connecting member (460) is combined with the second hole (450) to connect the other one of the gearbox housing (110) and the stator housing (210) to the adapter flange (400).

5. The power generation assembly of claim 4, wherein, The adapter flange (400) further comprises a second insulation layer (432) and a third insulation layer (433), the second insulation layer (432) is arranged on a first axial side of the adapter flange (400), and the third insulation layer (433) is arranged on a second axial side of the adapter flange (400).

6. The power generation assembly of claim 5, wherein, The first insulation layer (431) is an insulating sleeve arranged in the first hole (410), and the second insulation layer (432) and the third insulation layer (433) are insulating gaskets, respectively.

7. The power generation assembly of claim 5, wherein, The axial two ends of the first insulation layer (431) protrude relative to the axial two ends of the first hole (410), and the second insulation layer (432) and the third insulation layer (433) are respectively sleeved on the outer periphery of the first insulation layer (431).

8. The power generation assembly of any one of claims 5-7, wherein, The first connecting piece (420) is connected with the stator shell (210) through the first hole (410), and the second insulation layer (432) is continuously extended in a ring shape or is arranged in multiple along the circumference of the adapter flange plate (400), so that the adapter flange plate is insulated and separated from the stator shell (210) of the generator (200).

9. The power generation assembly of claim 8, wherein, A recess (440) is formed on the side of the adapter flange plate (400) facing the box (110) and corresponding to the first hole (410), and the third insulation layer (433) is arranged in the recess (440). The first connecting piece (420) is a bolt, and the recess (440) is used for accommodating the head (421) of the bolt and maintaining a gap between the head (421) of the bolt.

10. The power generation assembly of claim 9, wherein, The recess (440) is filled with an insulating sealing material (442), and the insulating sealing material (442) covers the outer periphery of the head (421) of the bolt.

11. The power generation assembly of claim 1, wherein, The second current suppression path includes a first bypass conduction path, and the first bypass conduction path conducts current between the rotor assembly (230) of the generator (200) and the box (110).

12. The power generation assembly of claim 11, wherein, The generator assembly further includes a first dynamic conduction device (40) arranged between the rotor assembly (230) of the generator and the box (110), and the first dynamic conduction device (40) forms the first bypass conduction path.

13. The power generation assembly of claim 12, wherein, The first dynamic conduction device (40) includes a first brush arranged between the rotor assembly (230) and the box (110), and the first brush includes a first brush support and brush hairs mounted on the brush support. The first brush support is mounted on the rotor assembly (230), and the brush hairs are in contact with the box (110).

14. The power generation assembly of claim 13, wherein, The first bypass conduction path (D) further includes a ring-shaped friction disc having a conductive function, which is mounted on the box (110), faces the first brush, and is in contact with the brush hairs of the first brush.

15. The power generation assembly of any one of claims 11-14, wherein, The generator assembly further includes a bearing (140) and a sealing ring (150) arranged between the output shaft (130) and the box (110), wherein the sealing ring (150) is arranged between the bearing (140) and the rotor assembly (230) in the axial direction, and the sealing ring (150) includes a conductive material to conduct current between the output shaft (130) and the box (110) to form the first bypass conduction path.

16. The power generation assembly of any one of claims 1-7, 11-14, wherein, The rotor assembly (230) comprises a rotor support and a rotor mounted on the rotor support, the rotor support is connected with the output shaft (130), the power generation assembly further comprises a third electric insulation assembly (50), the third electric insulation assembly (50) is arranged between the output shaft (130) and the rotor, so that the output shaft (130) and the rotor are electrically insulated, and the third electric insulation assembly (50) provides the second current suppression path.

17. The power generation assembly of claim 16, wherein, The rotor support comprises a first rotor support section and a second rotor support section connected with each other, the first rotor support section is connected with the output shaft, and the second rotor support section is arranged at the outer periphery of the first rotor support section and supports the rotor, and the third electric insulation assembly (50) is arranged at the connection between the first rotor support section and the second rotor support section, so that the first rotor support section and the second rotor support section are electrically insulated.

18. The power generation assembly of claim 16, wherein, The second current suppression path further comprises a second bypass conduction path, and the second bypass conduction path enables current conduction between the rotor and the stator housing (210).

19. The power generation assembly of claim 18, wherein, The second bypass conduction path comprises a second electric brush connected between the rotor and the stator housing (210), so that a circuit conduction path is established between the rotor and the stator housing (210), and the second electric brush is arranged at the other end of the generator opposite to the gear box (100).

20. A wind power unit characterized by The wind turbine generator set comprises the power generation assembly according to any one of claims 1-19 and an impeller connected with the power generation assembly, and the gear box has an input shaft, and the impeller is connected with the input shaft.

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