Generator and wind generating set

Abstract

The utility model relates to a generator and a wind generating set, and the generator comprises a housing which defines a containing cavity and is provided with an air inlet and an air outlet; the stator and rotor assembly is arranged in the accommodating cavity, the stator and rotor assembly comprises a rotor assembly and a stator assembly, the stator assembly at least partially surrounds the rotor assembly, and the stator assembly comprises a stator iron core and a stator coil; the containing cavity comprises a cooling cavity located on at least one side of the stator and rotor assembly in the axial direction, the partition assembly is arranged in the cooling cavity and divides the cooling cavity into a first sub-cavity and a second sub-cavity, and the first sub-cavity is located on the side, away from the stator and rotor assembly, of the second sub-cavity. One end of the first sub-cavity communicates with the air inlet, the other end of the first sub-cavity communicates with the second sub-cavity, one end of the second sub-cavity communicates with the air outlet, and the stator coil is partially located in the first sub-cavity. The generator provided by the embodiment of the utility model can improve the heat dissipation effect.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a generator and a wind turbine generator set. Background Art

[0002] In existing wind turbine generator sets, cooling structures such as air inlets, outlets, and coolers are usually provided on the outer shell of the generator to dissipate heat from the stator-rotor assembly during the operation of the generator. Such cooling structures cool the stator-rotor ends by delivering external air flow. However, as the single-unit capacity of existing wind turbine generator sets increases, the heat generation of the generator also increases. At the same time, due to the increase in the outer diameter of the existing rotor and the incomplete enclosure of the fixing band wound around the rotor coil, a centrifugal fan structure will be formed at this position during operation, resulting in a gas flow trajectory that interferes with the cooling air path, leading to low cooling efficiency and the possibility of insulation damage due to overheating at some points of the generator.

[0003] Therefore, there is an urgent need for a generator and a corresponding wind turbine generator set that can improve the cooling efficiency. Summary of the Utility Model

[0004] The embodiments of the present application provide a generator and a wind turbine generator set, and the generator can improve the cooling effect.

[0005] In a first aspect, according to an embodiment of the present application, a generator is proposed, including: a housing that encloses to form an accommodation cavity, and the housing has an air inlet and an air outlet that penetrate through the housing in the radial direction; a stator-rotor assembly disposed in the accommodation cavity, the stator-rotor assembly including a rotor assembly and a stator assembly, the stator assembly at least partially surrounds the rotor assembly, the stator assembly including a stator core and a stator coil protruding axially from the stator core along the stator-rotor assembly; a partition assembly, the accommodation cavity includes a cooling cavity axially located on at least one side of the stator-rotor assembly, the partition assembly is disposed in the cooling cavity and divides the cooling cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity is located on the side of the second sub-cavity away from the stator-rotor assembly, in the radial direction of the stator-rotor assembly, one end of the first sub-cavity communicates with the air inlet, and the other end communicates with the second sub-cavity, one end of the second sub-cavity communicates with the air outlet, and a part of the stator coil is located in the first sub-cavity.

[0006] According to an aspect of the embodiment of the present application, the partition assembly includes a partition plate, the partition plate is disposed in the cooling cavity and extends along the circumferential direction of the stator-rotor assembly, and in the radial direction, one end of the partition plate abuts against the stator coil, and the opposite end abuts against the housing.

[0007] According to an aspect of the embodiment of the present application, the partition plate includes a plurality of sub-plates, and the plurality of sub-plates are arranged in sequence along the circumferential direction and are spaced apart.

[0008] According to one aspect of the embodiments of the present application, in the axial direction, the distance between the partition plate and the stator core is L1, and the maximum distance between the end of the stator coil and the stator core is L2; 0.5 ≤ L1 / L2 ≤ 0.8.

[0009] According to one aspect of the embodiments of the present application, the partition plate is detachably connected to the housing, and the partition plate is adhesively connected to the stator coil.

[0010] According to one aspect of the embodiments of the present application, the rotor assembly includes a rotor core, a rotor coil protruding axially from the rotor core, and a coil fixing member. The coil fixing member extends circumferentially and surrounds the rotor coil. The coil fixing member is provided with a gap that extends circumferentially; in the axial direction, the gap is at least partially located in the second sub-chamber.

[0011] According to one aspect of the embodiments of the present application, the coil fixing member includes a plurality of gaps that are arranged axially at intervals; in the axial direction, the plurality of gaps are all located in the second sub-chamber.

[0012] According to one aspect of the embodiments of the present application, in the axial direction, the width of the gap is 30 mm to 50 mm.

[0013] According to one aspect of the embodiments of the present application, in the axial direction, the distance between the coil fixing member and the rotor core is greater than or equal to 35 mm.

[0014] According to one aspect of the embodiments of the present application, the stator coil includes a first section, a second section, and a bent section connecting the first section and the second section. The extending directions of the first section and the second section intersect; the separating assembly further includes a filling member that extends circumferentially and passes between the first section and the second section. The two radially opposite sides of the filling member are respectively abutted against the first section and the second section.

[0015] According to one aspect of the embodiments of the present application, in the axial direction, the filling member is located between the gap and the partition plate.

[0016] According to one aspect of the embodiments of the present application, cooling chambers and separating assemblies are provided at both axially opposite ends of the stator-rotor assembly, and the two separating assemblies are symmetrically arranged axially.

[0017] According to one aspect of the embodiments of the present application, the generator further includes a cooler provided on a side of the housing away from the accommodation chamber. The cooler includes an air inlet chamber and an air outlet chamber. The air outlet chamber is communicated with the air outlet, and the extending dimension of the air outlet in the axial direction is greater than or equal to the distance between the two second sub-chambers.

[0018] In a second aspect, according to the embodiments of the present application, a wind power generation set is proposed, including the generator in any one of the embodiments of the first aspect.

[0019] The generator provided by the embodiment of the present application includes a housing, a stator-rotor assembly disposed in the housing, and a partition assembly. The accommodation cavity in the housing includes a cooling cavity provided at least on one side of the stator-rotor assembly in its own axial direction. The partition assembly can divide the cooling cavity into a first sub-cavity and a second sub-cavity arranged axially. One end of the two sub-cavities in the radial direction is respectively communicated with the air inlet and the air outlet, and the other end is communicated with each other. Thus, a cooling air duct can be formed at the end of the stator-rotor assembly to make the air flow along a preset trajectory. At the same time, the stator coil is protrudingly provided at the end of the stator assembly in the axial direction. The stator coil is partially disposed in the first sub-cavity and partially disposed in the second sub-cavity, so that the air paths in the two sub-cavities can cool it, and at the same time, the position where the first sub-cavity is connected to the second sub-cavity is close to the end of the rotor assembly at the center, so as to better dissipate the heat of the end of the rotor coil, thereby improving the overall heat dissipation efficiency of the generator. Description of the Drawings

[0020] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0021] Figure 1 is a schematic structural diagram of a generator provided by an embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of a generator provided by another embodiment of the present application;

[0023] Figure 3 is Figure 2 an enlarged view of the area P shown;

[0024] Figure 4 is a schematic structural diagram of a wind turbine generator set provided by an embodiment of the present application.

[0025] Wherein:

[0026] 100 - Generator; 200 - Wind turbine generator set;

[0027] 10 - Housing; 20 - Stator-rotor assembly; 30 - Partition assembly; 40 - Cooler;

[0028] 11 - Accommodation cavity; 12 - Air inlet; 13 - Air outlet; 21 - Rotor assembly; 22 - Stator assembly; 31 - Partition plate; 32 - Filler; 41 - Air inlet cavity; 42 - Air outlet cavity;

[0029] 111 - Cooling cavity; 112 - First sub-cavity; 113 - Second sub-cavity; 211 - Rotor core; 212 - Rotor coil; 213 - Coil fixing member; 214 - Gap; 221 - Stator core; 222 - Stator coil;

[0030] 2221 - First section; 2222 - Second section; 2223 - Bent section;

[0031] X - axis direction. Detailed implementation manners

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some of the well - known structures and technologies are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0033] The orientation terms appearing in the following description are all the directions shown in the figures, and do not limit the specific structures in the molding die and molding method of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the meaning of "a plurality" is more than two. The terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected; the orientation or position relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In existing wind turbines, there are usually components connected in sequence such as a main drive shaft, a gearbox, and a generator to convert wind energy into electrical energy. Among them, the generator usually has a housing and a stator-rotor assembly accommodated in the housing, and auxiliary devices such as air inlets, outlets, coolers, or air ducts are provided at the housing to cool the stator-rotor assembly. The stator-rotor assembly usually includes a core located in the middle axially and partial coils protruding at both ends of the core. At the same time, the rotor assembly in the stator-rotor assembly usually has coil fixing parts for auxiliary fixation provided on the protruding partial coils. As the single-unit capacity of the wind turbine increases, the sizes of various parts of the stator-rotor assembly and the heat generated during operation gradually increase. Correspondingly, the thickness and size of the coil fixing parts also increase, further resulting in difficult heat dissipation at the rotor end position.

[0036] On this basis, the applicant found that in existing generators, air inlets are usually provided at positions near both ends of the housing side wall. The airflow entering from the air inlets flows radially and enters the air gap between the stator and the rotor or the rotor shaft hole, and finally converges and flows out in the air duct at the core. In this cooling circuit, the rotor end is not on the main airflow path and cannot be well cooled. At the same time, due to the increase in the outer diameter of the rotor, the part of the rotor coil protruding from the core will form a centrifugal fan to blow air outwards during rotation, so as to interfere with the original air path, further leading to a decrease in the cooling efficiency, and further making it possible for the generator to overheat and cause damage to the insulation structure.

[0037] To solve the above problems, the embodiment of the present application proposes a generator that can improve the heat dissipation efficiency and further improve the overall reliability of the generator.

[0038] It can be understood that the following embodiments of the present application only take the application of the generator in a wind turbine as an example for illustration, but the generator provided by the embodiments of the present application is not limited to the following embodiments and can also be used in other occasions where kinetic energy needs to be converted into electrical energy and be protected.

[0039] To better understand the present application, the following combines Figures 1 to 4 to describe in detail the generator and the wind turbine provided by the present application.

[0040] Please refer to Figures 1 to 3 , Figure 1 which is a schematic structural diagram of a generator provided by an embodiment of the present application, Figure 2 which is a schematic structural diagram of a generator provided by another embodiment of the present application, Figure 3 is Figure 2 an enlarged view of the area P shown.

[0041] In the first aspect, according to an embodiment of the present application, a generator 100 is proposed, comprising: a housing 10, enclosing a housing 11, the housing 10 having an air inlet 12 and an air outlet 13 arranged along its radial direction; a stator-rotor assembly 20, arranged in the housing 11, the stator-rotor assembly 20 comprising a rotor assembly 21 and a stator assembly 22, the stator assembly 22 at least partially surrounding the rotor assembly 21, the stator assembly 22 comprising a stator core 221 and a stator coil 222 protruding from the stator core 221 along the axial direction X of the stator-rotor assembly 20; a separation assembly 30, The accommodating chamber 11 includes a cooling chamber 111 located on at least one side of the stator-rotor assembly 20 in the axial direction X. The partition assembly 30 is arranged in the cooling chamber 111 and divides the cooling chamber 111 into a first sub-chamber 112 and a second sub-chamber 113. The first sub-chamber 112 is located on the side of the second sub-chamber 113 away from the stator-rotor assembly 20. In the radial direction of the stator-rotor assembly 20, one end of the first sub-chamber 112 is connected to the air inlet 12, and the other end is connected to the second sub-chamber 113. One end of the second sub-chamber 113 is connected to the air outlet 13, and the stator coil 222 is partially located in the first sub-chamber 112.

[0042] The embodiment of the present application provides a generator 100, which includes a housing 10 for providing protection and certain support, a stator and rotor assembly 20 disposed in the housing 10 and used to realize the power generation function, and a partition assembly 30 for partitioning and forming a required cooling cavity 111.

[0043] Specifically, the housing 10 may be made of metal and at least partially cylindrical, and may be provided with axial holes penetrating along the axial direction X at opposite ends thereof in the axial direction X, so as to facilitate the arrangement of a rotating component inside and the connection of the rotating shaft through the aforementioned axial holes. The housing 10 is enclosed to form an accommodating cavity 11 for accommodating the stator-rotor assembly 20 and the partition assembly 30.

[0044] The housing 10 has an air inlet 12 and an air outlet 13 which are arranged radially through the housing 10. The air inlet 12 and the air outlet 13 are used to connect the accommodating chamber 11 with the outside of the housing 10. The positions and areas of the two openings can be designed according to the specific air duct position inside the accommodating chamber 11. A power structure such as an air pump or a blower which can increase the air flow rate can be arranged at the positions of the air inlet 12 and / or the air outlet 13 to further improve the cooling efficiency. Optionally, the housing 10 can be provided with multiple air inlets 12 and / or multiple air outlets 13 at the same time so that it can adapt to air ducts at different positions. For example, the air outlet 13 can be located at a position corresponding to the iron core in the stator-rotor assembly 20, and the multiple air inlets 12 can be located at opposite sides of the air outlet 13 in the axial direction X, so that it is arranged corresponding to the end of the stator-rotor assembly 20.

[0045] The stator-rotor assembly 20 is disposed in the aforementioned accommodation cavity 11. The stator-rotor assembly 20 includes a stator assembly 22 and a rotor assembly 21. The rotating shaft of the rotor assembly 21 can optionally extend from the shaft hole on the housing 10 to be connected to structures such as a gearbox or other transmission shafts to transmit torque. The stator assembly 22 can be disposed outside the rotor assembly 21 and can optionally be disposed circumferentially around the rotor assembly 21. Both the stator assembly 22 and the rotor assembly 21 can be composed of structures such as iron cores and coils. The coils can optionally be wound around the iron cores and protrude from the iron cores in the axial direction X.

[0046] The stator-rotor assembly 20 is disposed in the accommodation cavity 11. In its own axial direction X, in the partial regions on both sides of the stator-rotor assembly 20 in the accommodation cavity 11, at least one side region forms a cooling cavity 111 and is provided with a partition assembly 30. A cooling air duct communicating between the air inlet 12 and the air outlet 13 can be formed inside the cooling cavity 111 to cool the ends of the stator-rotor assembly 20 through the flowing gas.

[0047] A partition assembly 30 is disposed in the cooling cavity 111. The partition assembly 30 is used to divide the cooling cavity 111 into a first sub-cavity 112 and a second sub-cavity 113 according to a preset shape and position. The two sub-cavities are arranged along the axial direction X of the stator-rotor assembly 20, and the first sub-cavity 112 is disposed on the side of the second sub-cavity 113 away from the stator-rotor assembly 20, that is, the first sub-cavity 112 can optionally be closer to the outside. Optionally, the first sub-cavity 112 and the second sub-cavity 113 can be arranged to extend completely circumferentially along the stator-rotor assembly 20, that is, to form an annular space. Or, the first sub-cavity 112 and the second sub-cavity 113 can optionally extend circumferentially to a partial region to form an arc-shaped space.

[0048] In the radial direction of the stator-rotor assembly 20, one ends of the first sub-cavity 112 and the second sub-cavity 113 close to the housing 10 are respectively communicated with the air inlet 12 and the air outlet 13, and the ends close to the central axis of the rotor assembly 21 are communicated with each other. In the cross-section extending along the axial direction X, an air duct approximately in a U shape is formed in the cooling cavity 111. Among them, the region where the first sub-cavity 112 and the second sub-cavity 113 are communicated can be compressed to the end position of the rotor assembly 21 so that the air ducts in the two sub-cavities can both pass through the coils at the rotor end and the coils at the stator end.

[0049] Specifically, the external air flow can flow into the first sub-chamber 112 from the air inlet 12, flow through the stator coil 222 to the position communicating with the second sub-chamber 113, and at least part of the end of the rotor assembly 21 is disposed in or adjacent to this communication area. Subsequently, the air flow can optionally flow through the second sub-chamber 113 to the air outlet 13, or the air flow can optionally enter the air gap between the stator and the rotor or the rotor shaft hole, and is discharged through the interlayer space between the iron core laminations, and then flows to the air outlet 13, thus forming a complete cooling circuit and being able to sufficiently cool the stator and the end coils of the rotor.

[0050] Further, in the embodiment of the present application, the part of the stator coil 222 protruding from the iron core is partially disposed in the first sub-chamber 112 and the other part is disposed in the second sub-chamber 113, that is, the position of the partition assembly 30 in the axial direction X is set in the area corresponding to the stator coil 222. Thus, the cooling air flow can pass through the position where the stator coil 222 is located multiple times, so as to effectively improve the heat dissipation efficiency of the generator 100 without increasing the size in the axial direction X.

[0051] In some alternative embodiments, the partition assembly 30 includes a partition plate 31. The partition plate 31 is disposed in the cooling chamber 111 and extends along the circumferential direction of the stator-rotor assembly 20. In the radial direction, one end of the partition plate 31 abuts against the stator coil 222, and the opposite end abuts against the housing 10.

[0052] The partition assembly 30 in the embodiment of the present application can adopt the structural form of the partition plate 31. The partition plate 31 is a plate-shaped member disposed in the cooling chamber 111. The plate-shaped member extends along the circumferential direction and can be optionally arranged in an arc shape or a ring shape. The plane or curved surface of the partition plate 31 is perpendicular to the axial direction X. Exemplarily, the partition plate 31 can be optionally a flat ring-shaped plate member, and its plane can be perpendicular to the axial direction X.

[0053] The partition plate 31 can be disposed on the circumferential side of the stator assembly 22 and is used to form a common chamber wall between the first sub-chamber 112 and the second sub-chamber 113. The inner side of the partition plate 31 in the radial direction can abut against the stator assembly 22, and the outer side can abut against the housing 10, so as to form a clear partition wall at this position and have good airtightness.

[0054] Optionally, the radial extension dimension of the partition plate 31 can be designed according to the distance between the housing 10 and the stator assembly 22, and the inner and outer edges of the partition plate 31 can be shaped to follow the stator assembly 22 and the housing 10 respectively, so as to further improve the airtightness at the partition plate 31.

[0055] By disposing the partition plate 31 in the cooling chamber 111, the first sub-chamber 112 and the second sub-chamber 113 can be conveniently and stably separated.

[0056] In some alternative embodiments, the partition plate 31 includes multiple sub-plates, and the multiple sub-plates are arranged in sequence along the circumferential direction and are spaced apart.

[0057] Optionally, to facilitate the assembly of the partition plate 31, the partition plate 31 can be configured to be composed of multiple sub-plates. These sub-plates are arranged in sequence along the circumferential direction of the stator-rotor assembly 20. Each sub-plate can be optionally arc-shaped, and each sub-plate can be optionally of the same shape and size and are equally spaced in the circumferential direction.

[0058] Specifically, the partition plate 31 can include 2 to 4 sub-plates, and the spacing between adjacent sub-plates can be less than or equal to 10 mm, which not only provides installation allowance between the sub-plates but also ensures good airtightness. Optionally, the partition plate 31 can be made of materials such as epoxy resin or fiberglass, and its extension dimension in the axial direction X can be 3 mm to 10 mm, further optionally 5 mm to 8 mm.

[0059] By splitting the partition plate 31 into multiple sub-plates, it is convenient to transport the sub-plates into the accommodation cavity 11 and also convenient for installation.

[0060] In some alternative embodiments, in the axial direction X, the spacing between the partition plate 31 and the stator core 221 is L1, and the maximum spacing between the stator coil 222 and the stator core 221 is L2; 0.5 ≤ L1 / L2 ≤ 0.8.

[0061] In the embodiment of the present application, part of the stator coil 222 is located in the first sub-cavity 112, and the other part is arranged in the second sub-cavity 113, that is, the setting position of the partition plate 31 in the axial direction X is within the area where the stator coil 222 is located.

[0062] Further, in the axial direction X of the stator-rotor assembly 20, the spacing between the partition plate 31 and the stator core 221 is denoted as L1. Here, the spacing refers to the vertical spacing in the axial direction X, that is, a connecting line extending along the axial direction X is made from one of the partition plate 31 and the stator core 221 to the other, and the length of the shortest connecting line is denoted as L1. Similarly, the maximum spacing between the stator coil 222 and the stator core 221 is denoted as L2. Here, the spacing refers to the length of the connecting line made from one of the partition plate 31 and the stator core 221 to the other and then extending along the axial direction X. The maximum spacing, that is, the length of the longest one among the connecting lines, is L2.

[0063] On this basis, the ratio of L1 to L2 can be selected to be between 0.5 and 0.8, and further preferably between 0.6 and 0.7, that is, the partition plate 31 is arranged at the position of 1 / 2 to 2 / 3 of the stator coil 222, so that the stator coils 222 on both sides of the partition plate 31 and the corresponding rotor coils 212 on the inner side are more evenly distributed in the first sub-chamber 112 and the second sub-chamber 113, further improving the heat dissipation efficiency.

[0064] Arranging the partition plate 31 at the position where the stator coil 222 is located can save the space required when the partition plate 31 is arranged on both sides of the stator-rotor assembly 20 in the axial direction X. Therefore, the heat dissipation efficiency can be effectively improved without increasing the axial length of the generator 100 in the axial direction X.

[0065] In some alternative embodiments, the partition plate 31 is detachably connected to the housing 10, and the partition plate 31 is adhesively connected to the stator coil 222.

[0066] The partition plate 31 is arranged in the cooling chamber 111 and is used to separate the first sub-chamber 112 and the second sub-chamber 113. The plate-like structure can be optionally connected to the stator coil 222 on the inner side and connected to the housing 10 on the outer side at the same time.

[0067] Optionally, the partition plate 31 and the housing 10 are detachably connected. For example, it can be connected by fasteners such as bolts, snap connection, clamping connection, etc. For the convenience of connection, the partition plate 31 can be provided with a connecting portion or auxiliary connecting members such as a flange extending along the axial direction X.

[0068] Optionally, the partition plate 31 and the stator coil 222 can be adhesively connected. For example, they can be adhesively connected by a heat-resistant glass glue or other adhesive materials. For the convenience of connection, a barrier member can be arranged at the stator coil 222 to assist in axially positioning the partition plate 31. The barrier member can be a structure such as a fiberglass braided rope wound around the stator coil 222. Through the barrier member, the connection between the partition plate 31 and the stator coil 222 can be made more stable. In the embodiment provided with the barrier member, the barrier member, the end of the partition plate 31 and the stator coil 222 can be adhesively connected together by an adhesive material to further make the connection stable.

[0069] In some alternative embodiments, the rotor assembly 21 includes a rotor core 211, a rotor coil 212 protruding from the rotor core 211 in the axial direction X, and a coil fixing member 213. The coil fixing member 213 extends circumferentially and surrounds the rotor coil 212. The coil fixing member 213 is provided with a gap 214, and the gap 214 extends circumferentially; in the axial direction X, the gap 214 is at least partially located in the second sub-chamber 113.

[0070] Similarly to the stator assembly 22, the rotor assembly 21 may include a rotor core 211 and a rotor coil 212 protruding from the rotor core 211 in the axial direction X. In order to make the structure of the rotor coil 212 stable and not easily deformed during rotation, a coil fixing member 213 may be wound around the outer peripheral side of the rotor coil 212. The coil fixing member 213 extends around the rotor coil 212 and is tightened to provide a fixing effect in the radial direction, making the structure of the rotor coil 212 stable and reliable.

[0071] Optionally, the coil fixing member 213 may be an annular fixing structure, such as an annular member made of an elastic material such as rubber and sleeved on the rotor coil 212; alternatively, the coil fixing member 213 may be a binding hoop such as a fiber preform ring with a certain hardness; or, the coil fixing member 213 may be selected as a circular composite film layer formed by winding multiple layers of films on the rotor coil 212. In the axial direction X, the extension dimension of the coil fixing member 213 may be about 200 mm to 300 mm, and the specific parameters may be designed according to the sizes of the rotor core 211 and the rotor coil 212. The present application does not make specific limitations thereto.

[0072] In the axial direction X, the coil fixing member 213 in the embodiment of the present application adopts a discontinuous and non - continuous extension form to form a gap 214 in the coil fixing member 213. Exemplarily, in the embodiment where the coil fixing member 213 is a binding hoop, a plurality of hoop bodies arranged at intervals in the axial direction X may be provided, or, in the embodiment where the coil fixing member 213 is formed by laminating multiple layers of films, the gap 214 may be formed by changing the winding position.

[0073] Optionally, the gap 214 may extend circumferentially completely and be annularly arranged. The coil fixing member 213 may be provided with a plurality of gaps 214, and these gaps 214 may be arranged at intervals in the axial direction X. At least part of the gaps 214 are located in the second sub - cavity 113 so that the air flow can flow from the inside of the rotor coil 212 to the outside through the gaps 214.

[0074] The rotor coil 212 in the rotor assembly 21 protrudes from the rotor core 211. The rotor coil 212 is composed of a plurality of coils spaced from each other in the circumferential direction. In the embodiment without the coil fixing member 213, the air flow can pass radially between the coils during operation. After the coil fixing member 213 is provided, by making it have a gap 214, the air flow can still pass radially through the rotor coil 212 at the gap 214 to provide a good heat dissipation effect.

[0075] In some alternative embodiments, the coil fixing member 213 includes a plurality of gaps 214, and the gaps 214 are arranged at intervals in the axial direction X; in the axial direction X, a plurality of gaps 214 are all located in the second sub - cavity 113.

[0076] To further facilitate the smooth flow of gas, the coil fixing member 213 may be provided with a plurality of gaps 214 at the same time. These gaps 214 are arranged in sequence in the axial direction X, and may be arranged at equal intervals and extend parallel to each other. Optionally, each gap 214 may have the same width.

[0077] Furthermore, these gaps 214 may all be located in the second sub-chamber 113. The rotor coil 212 protrudes outward from the end of the rotor core, and its extension dimension in the second sub-chamber 113 is relatively large. The air flow in the first sub-chamber 112 may flow through the gap between the end of the rotor coil 212 and the housing 10, and then enter the second sub-chamber 113 and at least partially flow through each gap 214, further improving the heat dissipation effect at the rotor coil 212.

[0078] In some alternative embodiments, in the axial direction X, the width of the gap 214 is 30 mm to 50 mm.

[0079] In the axial direction X of the stator-rotor assembly 20, the width of each gap 214 may be 30 mm to 50 mm, the number of gaps 214 may be 1 to 3, and these gaps 214 may have the same width and be arranged at equal intervals in the axial direction X.

[0080] Setting the width of the gap 214 within a preset range can improve the flow velocity and flow rate of the gas on the basis of avoiding the rotor coil 212 from being too long, thereby improving the heat dissipation effect.

[0081] In some alternative embodiments, in the axial direction X, the distance between the coil fixing member 213 and the rotor core 211 is greater than or equal to 35 mm.

[0082] In the embodiment provided with the coil fixing member 213, a passage for gas to pass through may also be left in a partial area of the rotor coil 212 close to the rotor core. Specifically, at one end of the rotor coil 212 far from the rotor core 211 in the axial direction X, the coil fixing member 213 may extend to cover the position flush with the end, so as to make the structure of the rotor more stable and reliable; relatively, at the position close to the rotor core 211 in the axial direction X, the coil fixing member 213 may not extend to be flush with the end of the rotor core 211, that is, a certain distance is maintained from the rotor core 211, so as to form an air flow passage similar to the aforementioned gap 214 on the basis of reducing the possibility of mutual interference between the two.

[0083] Furthermore, the air flow passage at the position close to the rotor core 211 may have a certain width, specifically greater than or equal to 35 mm, and may be greater than or equal to 40 mm, so as to facilitate the smooth flow of gas.

[0084] It can be understood that the rotor coil 212 protrudes from the rotor core 211. This part of the rotor coil 212 may include a straight segment extending from a fixed slot on the rotor core 211, and an inclined bending segment connecting the straight segments extending from different fixed slots. On this basis, one end of the coil fixing member 213 close to the rotor core 211 can extend to near the junction of the straight segment and the inclined bending segment, maintaining a certain distance from the rotor core 211, so that air holes can also be formed at the position of the straight segment to further improve the heat dissipation efficiency.

[0085] Meanwhile, in the circumferential direction of the stator-rotor assembly 20, the gap size between adjacent rotor coils 212 can be greater than or equal to 4.5 mm, so that a sufficient-sized air duct can be formed between the coils for air flow to pass through.

[0086] In some alternative embodiments, the stator coil 222 includes a first segment 2221, a second segment 2222, and a bending segment 2223 connecting the first segment 2221 and the second segment 2222. The extending directions of the first segment 2221 and the second segment 2222 intersect; the separating assembly 30 further includes a filling member 32. The filling member 32 extends circumferentially and passes through between the first segment 2221 and the second segment 2222. The two radially opposite sides of the filling member 32 are respectively abutted against the first segment 2221 and the second segment 2222.

[0087] In the stator assembly 22, the stator core 221 can be selected to have a plurality of mounting slots. The coil passes through the mounting slots. The stator coil 222 protruding from the stator core 221 can be selected to extend from one mounting slot, and after being bent, it extends into the core from another mounting slot. On this basis, the stator coil 222 may include a first segment 2221 and a second segment 2222 that extend linearly and whose extending directions intersect, and a bending segment 2223 connecting the two. It can be understood that the bending segment 2223 connecting the two here can be selected to extend continuously or have a discontinuity in the middle.

[0088] On this basis, a filling member 32 can be optionally arranged between the first segment 2221 and the second segment 2222 of the stator coil 222. The filling member 32 can extend circumferentially and pass through between each first segment 2221 and the second segment 2222. The two end portions of the filling member 32 in the radial direction can be respectively abutted against the first segment 2221 and the second segment 2222, that is, the filling member 32 can form a blocking structure at the gap 214 of the stator coil 222 and serve as a part of the separating assembly 30 for separating the first sub-chamber 112 and the second sub-chamber 113.

[0089] Optionally, the filling member 32 can be made of materials such as fiberglass braided ropes, etc. Its diameter can be selected to be greater than or equal to 20 mm, and it is connected and fixed to the stator coil 222 through a thinner bundling band or other fixing members to make its position stable.

[0090] The filling member 32 in the embodiment of the present application can improve the airtightness at the stator coil 222, thereby compressing the connection between the first sub-chamber 112 and the second sub-chamber 113 downward, enabling the airflows in the two sub-chambers to respectively mirror the stator coil 222 and the rotor coil 212, thus further improving the cooling efficiency.

[0091] In some alternative embodiments, in the axial direction X, the filling member 32 is located between the gap 214 and the partition plate 31.

[0092] Optionally, in the axial direction X, the partition structure formed by the filling member 32 can be located between the gap 214 and the partition plate 31, that is, the filling member 32 and the partition plate 31 can jointly form the boundary between the first sub-chamber 112 and the second sub-chamber 113, and this boundary is located on the side of the gap 214 away from the rotor core 211.

[0093] Meanwhile, the dimension of the space sandwiched between the first section 2221 and the second section 2222 in the radial direction has a tendency to gradually decrease in the direction close to the stator core 221. Setting the filling member 32 on the side of the partition plate 31 closer to the gap 214 can reduce the required volume or width of the filling member 32, facilitating the setting of the filling member 32 and reducing costs.

[0094] In some alternative embodiments, cooling chambers 111 and partition assemblies 30 are provided at both opposite ends of the stator-rotor assembly 20 in the axial direction X, and the two partition assemblies 30 are symmetrically arranged with respect to each other in the axial direction X.

[0095] In the embodiment of the present application, the stator coil 222 and the rotor coil 212 protrude at both ends of the stator-rotor assembly 20 in the axial direction X. Thus, the spaces at both ends of the stator-rotor assembly 20 can be set as cooling chambers 111 and partition assemblies 30 are respectively provided. On the basis that the stator-rotor assembly 20 is substantially symmetric in the axial direction X, the cooling chambers 111 and the partition assemblies 30 at both ends can be symmetrically arranged with respect to a certain reference plane, and this reference plane can be perpendicular to the axial direction X.

[0096] Providing the cooling chambers 111 and the partition assemblies 30 at both ends can enable good cooling of both side ends of the stator-rotor assembly 20, further improving the overall heat dissipation efficiency of the generator 100.

[0097] In some alternative embodiments, the generator 100 further includes a cooler 40. The cooler 40 is provided on the side of the housing 10 away from the accommodation chamber 11. The cooler 40 includes an air inlet chamber 41 and an air outlet chamber 42. The air outlet chamber 42 is in communication with the air outlet 13, and the extension dimension of the air outlet 13 in the axial direction X is greater than or equal to the distance between the two second sub-chambers 113.

[0098] In the embodiment of the present application, the generator 100 may further be provided with a cooler 40 outside the housing 10. The cooler 40 can be used to divert the air at the air inlet 12 and the air outlet 13 or to provide components such as a blower to increase the cooling air speed.

[0099] Optionally, the cooler 40 may be provided with air ducts respectively corresponding to and communicating with the air inlet 12 and the air outlet 13. The air duct communicating with the air outlet 13 may be arranged to cover the regions corresponding to the stator core 221, the rotor core 211, and the second sub-chambers 113 on both sides in the axial direction X. Specifically, in the embodiment where the partitioning assembly 30 includes a partition plate 31, the region covered by the air outlet 13 in the axial direction X can extend to both sides beyond the partition plate 31, so that the air duct can smoothly discharge the relatively hot gas flowing out of this part of the region, making the cooling cycle smooth.

[0100] Please refer to Figure 4 , Figure 4 FIG. is a schematic structural diagram of a wind turbine generator set provided by an embodiment of the present application. Second, according to an embodiment of the present application, a wind turbine generator set 200 is proposed, including the generator 100 in any one of the first aspects.

[0101] The wind turbine generator set 200 provided by the embodiment of the present application has all the beneficial effects of the generator 100 provided by the embodiment of the present application. For the specific description of the generator 100, reference can be made to the above embodiments, and details are not repeated herein.

[0102] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A generator, characterized in that: include: A housing is enclosed to form a receiving cavity, and the housing has an air inlet and an air outlet which are arranged radially through the housing; A stator-rotor assembly is arranged in the accommodating cavity, the stator-rotor assembly comprises a rotor assembly and a stator assembly, the stator assembly is at least partially arranged around the rotor assembly, the stator assembly comprises a stator core and a stator coil arranged protruding from the stator core along the axial direction of the stator-rotor assembly; A partition assembly, wherein the accommodating cavity includes a cooling cavity located on at least one side of the stator-rotor assembly in the axial direction, the partition assembly is arranged in the cooling cavity and divides the cooling cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity is located on the side of the second sub-cavity away from the stator-rotor assembly, in the radial direction of the stator-rotor assembly, one end of the first sub-cavity is connected to the air inlet, and the other end is connected to the second sub-cavity, one end of the second sub-cavity is connected to the air outlet, and the stator coil is partially located in the first sub-cavity.

2. The generator according to claim 1, characterized in that: The partition assembly includes a partition plate, which is arranged in the cooling cavity and extends along the circumference of the stator-rotor assembly. In the radial direction, one end of the partition plate abuts against the stator coil, and the other opposite end abuts against the shell.

3. The generator according to claim 2, characterized in that: The partition plate includes a plurality of sub-plates, and the plurality of sub-plates are sequentially arranged and spaced apart along the circumferential direction.

4. The generator according to claim 2, characterized in that: In the axial direction, the distance between the partition plate and the stator core is L1, and the maximum distance between the end of the stator coil and the stator core is L2; 0.5≤L1 / L2≤0.

8.

5. The generator according to claim 2, characterized in that: The partition plate is detachably connected to the shell, and the partition plate is adhesively connected to the stator coil.

6. The generator according to claim 2, characterized in that: The rotor assembly includes a rotor core, a rotor coil protruding from the rotor core in the axial direction, and a coil fixing member, wherein the coil fixing member extends along the circumferential direction and surrounds the rotor coil, and the coil fixing member is provided with a gap, and the gap extends along the circumferential direction; In the axial direction, the gap is at least partially located in the second sub-cavity.

7. The generator according to claim 6, characterized in that: The coil fixing member comprises a plurality of gaps, and the gaps are arranged at intervals along the axial direction; In the axial direction, the plurality of gaps are all located in the second sub-cavity.

8. The generator according to claim 6, characterized in that: In the axial direction, the width of the gap is 30 mm to 50 mm.

9. The generator according to claim 6, characterized in that: In the axial direction, the distance between the coil fixing part and the rotor core is greater than or equal to 35 mm.

10. The generator according to claim 6, characterized in that: The stator coil includes a first section, a second section, and a bending section connected between the first section and the second section, and the extension directions of the first section and the second section intersect; The partition assembly further includes a filling piece, which extends along the circumferential direction and passes between the first section and the second section. The filling piece abuts against the first section and the second section at two opposite sides in the radial direction, respectively.

11. The generator according to claim 10, characterized in that: In the axial direction, the filling member is located between the gap and the partition plate.

12. The generator according to claim 1, characterized in that The cooling cavity and the partition assembly are disposed at opposite ends of the stator-rotor assembly in the axial direction, and the two partition assemblies are symmetrically disposed in the axial direction.

13. The generator according to claim 12, characterized in that The generator also includes a cooler, which is arranged on a side of the casing away from the accommodating cavity. The cooler includes an air inlet cavity and an air outlet cavity. The air outlet cavity is connected to the air outlet, and the extension dimension of the air outlet in the axial direction is greater than or equal to the distance between the two second sub-cavities.

14. A wind turbine generator set, characterized in that: It comprises the generator according to any one of claims 1 to 13.

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