Generator and wind generating set

Abstract

The utility model relates to a generator and a wind generating set. The generator comprises a rotor structure; the stator structure sleeves the outer side of the rotor structure, and the rotor structure can rotate relative to the stator structure; an annular channel is formed between the stator structure and the rotor structure, the annular channel is through in the axial direction of the stator structure, the stator structure is provided with a plurality of first radial channels, one end of each first radial channel is communicated with the annular channel, and the other end of each first radial channel penetrates through the peripheral surface of the stator structure; end channels are arranged at the two ends of the stator structure in the axial direction, the first ends of the end channels penetrate through the end face of one end of the stator structure in the axial direction, and the second ends of the end channels penetrate through the peripheral face of the stator structure; two axial ends of the stator structure are respectively connected with a winding, the annular channel is located on the inner side of the winding along the radial direction of the stator structure, and the end channel is located on the outer side of the winding along the radial direction of the stator structure. According to the invention, the winding can be effectively cooled, and the normal operation of the generator is ensured.

Description

Technical Field

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

[0002] A generator is an important component of a wind turbine generator set. The generator mainly includes a housing, a stator and a rotor. An air inlet and an air outlet are provided on the housing. The stator and the rotor are coaxially sleeved and arranged inside the housing. A heat dissipation channel is formed on, in and / or between the rotor, the stator. The gas outside the housing enters the inside of the housing through the air inlet, flows through each heat dissipation channel and then flows out of the housing through the air outlet. During the process of the gas flowing through each heat dissipation channel, heat exchange is carried out with the stator and / or the rotor to cool down the stator and / or the rotor.

[0003] Windings are provided at both axial ends of the stator. In actual use, it is found that during the operation of the generator, the temperature at the winding is relatively high. At present, most generators do not have a separate heat dissipation structure for the windings. Therefore, how to effectively cool down the windings is an urgent problem to be solved in this field. Summary of the Utility Model

[0004] The embodiments of the present application provide a generator and a wind turbine generator set, which can effectively cool down the windings and ensure the normal operation of the generator.

[0005] The embodiments of the present application provide a generator, wherein the generator includes:

[0006] A rotor structure;

[0007] A stator structure sleeved outside the rotor structure, and the rotor structure can rotate relative to the stator structure;

[0008] An annular channel is formed between the stator structure and the rotor structure. The annular channel is in a through state along the axial direction of the stator structure. A plurality of first radial channels are provided on the stator structure. One end of the first radial channel is communicated with the annular channel, and the other end of the first radial channel penetrates the outer peripheral surface of the stator structure;

[0009] End channels are provided at both axial ends of the stator structure. The first end of the end channel penetrates one end face of the stator structure along the axial direction, and the second end of the end channel penetrates the outer peripheral surface of the stator structure;

[0010] Windings are respectively connected and provided at both axial ends of the stator structure. The annular channel is located inside the winding along the radial direction of the stator structure, and the end channel is located outside the winding along the radial direction of the stator structure.

[0011] According to one aspect of the embodiments of the present application, the stator structure includes:

[0012] A stator core;

[0013] Two stator retaining rings, respectively connected to both ends of the stator core along its axial direction. The end channels are provided between the stator retaining rings and the stator core. The first end of the end channel penetrates the outer peripheral surface of the stator structure at the connection between the stator core and the stator retaining ring, and the second end of the end channel axially penetrates the stator retaining ring along the stator structure.

[0014] According to one aspect of the embodiments of the present application, the stator retaining ring includes:

[0015] A stator slot plate, having an annular sheet-like structure;

[0016] A plurality of tooth bars, connected to the surface of the stator slot plate facing the stator core. Each of the tooth bars is arranged at intervals along the circumferential direction of the stator structure, and the tooth bars extend radially along the stator structure. An end channel is formed between every two adjacent tooth bars.

[0017] According to one aspect of the embodiments of the present application, a plurality of ventilation grooves are recessed at the inner edge of the stator slot plate. One ventilation groove is provided between every two adjacent tooth bars, and the ventilation grooves are in one-to-one correspondence and communication with the end channels.

[0018] According to one aspect of the embodiments of the present application, the generator includes a housing, and both the stator structure and the rotor structure are arranged inside the housing; an air inlet and an air outlet are provided on the housing. The second end of the end channel and each of the first radial channels are in corresponding communication with the air outlet; along the axial direction of the rotor structure, the air inlet is located on the side of the winding away from the stator structure.

[0019] According to one aspect of the embodiments of the present application, two positioning end plates are provided on the inner peripheral surface of the housing. The two positioning end plates are arranged at intervals along the axial direction of the stator structure. The stator structure is clamped and positioned between the two positioning end plates, and a gap is formed between the outer peripheral surface of the stator structure and the inner peripheral surface of the housing. Through holes are provided on the end plates, and the through holes are in communication with the gap.

[0020] According to one aspect of the embodiments of the present application, a guide ring plate is provided on the inner peripheral surface of the housing. The guide ring plate is located between the air inlet and the winding, and the outer peripheral surface of the guide ring plate is connected to the inner peripheral surface of the housing. A guide channel is formed between the guide ring plate and the winding.

[0021] According to one aspect of the embodiments of the present application, along the axial direction of the stator structure, the projection of the inner edge of the flow guiding ring plate falls within the projection of the annular channel.

[0022] According to one aspect of the embodiments of the present application, fans are respectively provided on the axially opposite end faces of the rotor structure, and the air outlet sides of the fans face the winding.

[0023] The present application also provides a wind power generating set, wherein the wind power generating set includes the generator as described above.

[0024] In the generator and the wind power generating set provided by the embodiments of the present application, by arranging the annular channel to be located radially inside the winding along the stator structure and connecting the annular channel to the outer peripheral surface of the stator structure through the first radial channel, cooling gas can flow through the inner side of the winding along the radial direction of the stator structure and exchange heat with the winding to cool the winding; at the same time, an end channel is arranged to be located radially outside the winding along the stator structure and penetrate the outer peripheral surface of the stator structure, so that the cooling gas can flow through the outer side of the winding along the radial direction of the stator structure and exchange heat with the winding; thus, the winding can be effectively cooled and the normal operation of the generator can be ensured. Description of the Drawings

[0025] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0026] Figure 1 It is a schematic structural diagram of the generator provided by the embodiments of the present application;

[0027] Figure 2 It is a path diagram of the flow of cooling gas inside the generator provided by the embodiments of the present application;

[0028] Figure 3 It is an axially partial structural diagram of the stator retaining ring of the stator structure of the generator provided by the embodiments of the present application;

[0029] Figure 4 It is a circumferential sectional structural diagram of the stator retaining ring of the stator structure of the generator provided by the embodiments of the present application;

[0030] Figure 5 It is another schematic structural diagram of the generator provided by the embodiments of the present application.

[0031] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0032] Explanation of the Reference Numerals in the Drawings:

[0033] 1. Rotor structure; 11. Axial channel; 12. Second radial channel; 2. Stator structure; 21. First radial channel; 22. End channel; 23. Stator core; 24. Stator retaining ring; 241. Stator slot plate; 2411. Ventilation slot; 242. Tooth pressing strip; S. Annular channel; 3. Winding; 4. Machine housing; 41. Air inlet; 42. Air outlet; 43. Positioning end plate; 431. Through hole; 432. Gap; 44. Guide ring plate; 45. Guide channel; 5. Fan. Detailed implementation mode

[0034] 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.

[0035] The orientation terms appearing in the following description are all the directions shown in the drawings, and do not limit the specific steps and structures of the generator and wind turbine generator set of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly defined and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected. 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.

[0036] As Figure 1 and Figure 2 shown, an embodiment of the present application provides a generator, wherein the generator includes a rotor structure 1 and a stator structure 2. The stator structure 2 is sleeved outside the rotor structure 1, and the rotor structure 1 can rotate relative to the stator structure 2 to generate electricity.

[0037] An annular channel S is formed between the stator structure 2 and the rotor structure 1. The annular channel S is in a through state along the axial direction of the stator structure 2. A plurality of first radial channels 21 are provided on the stator structure 2. One end of the first radial channel 21 communicates with the annular channel S, and the other end of the first radial channel 21 penetrates the outer peripheral surface of the stator structure 2. The first radial channels 21 are arranged at intervals along the axial direction and / or the circumferential direction of the stator structure 2. During the cooling process, the cooling air can enter between the rotor structure 1 and the stator structure 2 from the annular channel S, and then be discharged to the outside of the rotor structure 1 through the respective first radial channels 21, so as to conduct the heat between the rotor structure 1 and the stator structure 2 and inside the stator structure 2 to the outside of the stator structure 2, improving the overall heat dissipation efficiency of the rotor structure 1 and the stator structure 2 and enhancing the cooling effect.

[0038] End channels 22 are provided at both axial ends of the stator structure 2. The first end of the end channel 22 penetrates one end face of the stator structure 2 in the axial direction, and the second end of the end channel 22 penetrates the outer peripheral surface of the stator structure 2. During the cooling process, through the end channels 22, it can cooperate with the annular channel S to circulate the cooling air reaching the ends of the stator structure 2, so as to reduce the accumulation of heat at the axial ends of the stator structure 2 and enhance the cooling and temperature reduction effect at the axial end positions of the stator structure 2.

[0039] Windings 3 are respectively connected and provided at both axial ends of the stator structure 2. The annular channel S is located inside the windings 3 along the radial direction of the stator structure 2, and the end channels 22 are located outside the windings 3 along the radial direction of the stator structure 2.

[0040] By arranging the annular channel S inside the windings 3 along the radial direction of the stator structure 2 and making the annular channel S communicate with the outer peripheral surface of the stator structure 2 through the first radial channels 21, the cooling gas can flow through the inner side of the windings 3 along the radial direction of the stator structure 2 and perform heat exchange with the windings 3 to cool the windings 3. At the same time, the end channels 22 are arranged outside the windings 3 along the radial direction of the stator structure 2 and the end channels 22 penetrate the outer peripheral surface of the stator structure 2, so that the cooling gas can flow through the outer side of the windings 3 along the radial direction of the stator structure 2 and perform heat exchange with the windings 3. In this way, the windings 3 can be effectively cooled and the normal operation of the generator can be ensured.

[0041] As Figure 1 and Figure 2 shown, according to one aspect of the embodiments of the present application, the stator structure 2 includes a stator core 23 and two stator retaining rings 24.

[0042] The stator core 23 is composed of a plurality of stator chips stacked.

[0043] Two stator retaining rings 24 are respectively connected to both axial ends of the stator core 23. An end channel 22 is provided between the stator retaining ring 24 and the stator core 23, that is, the end channel 22 is formed by enclosing the stator core 23 and the stator retaining ring 24. The first end of the end channel 22 penetrates the outer peripheral surface of the stator structure 2 at the connection between the stator core 23 and the stator retaining ring 24, and the second end of the end channel 22 axially penetrates the stator retaining ring 24 along the stator structure 2.

[0044] There are multiple end channels 22, and the multiple end channels 22 are evenly spaced along the circumferential direction of the stator structure 2 to uniformly and quickly transfer the heat at the axial end of the stator structure 2 to the outer peripheral side of the stator structure 2.

[0045] Optionally, the number of stator chips of the stator core 23 and the number of end channels 22 can both be flexibly adjusted according to the actual design of the generator.

[0046] As Figure 3 and Figure 4 shown, according to one aspect of the embodiment of the present application, the stator retaining ring 24 includes a stator slot plate 241 and a plurality of tooth bars 242.

[0047] The stator slot plate 241 has an annular sheet-like structure, and its radial projection along the stator structure 2 can coincide with the radial projection of the stator core 23 along the stator structure 2.

[0048] A plurality of tooth bars 242 are connected to the surface of the stator slot plate 241 facing the stator core 23. The tooth bars 242 are spaced along the circumferential direction of the stator structure 2, and the tooth bars 242 extend radially along the stator structure 2. An end channel 22 is formed between every two adjacent tooth bars 242. The tooth bars 242 are integrally formed and connected to the stator slot plate 241 to ensure the structural strength of the stator retaining ring 24.

[0049] As Figure 3 shown, according to one aspect of the embodiment of the present application, a plurality of ventilation grooves 2411 are recessed at the inner edge of the stator slot plate 241. One ventilation groove 2411 is provided between every two adjacent tooth bars 242, and the ventilation grooves 2411 are in one-to-one correspondence and communication with the end channels 22. By providing the ventilation grooves 2411, after the stator slot plate 241 is installed at the end of the stator core 23, the ventilation grooves 2411 axially penetrate along the stator structure 2 to allow the cooling gas to smoothly flow into the interior of the end channels 22.

[0050] As Figure 1 and Figure 2As shown, according to one aspect of the embodiments of the present application, the generator includes a housing 4. The stator structure 2 and the rotor structure 1 are both arranged inside the housing 4. The housing 4 is used to provide shielding protection for the stator structure 2, the rotor structure 1 and other components arranged inside it, and at the same time enables the generator to have a complete external structure.

[0051] An air inlet 41 and an air outlet 42 are provided on the housing 4. There are multiple air inlets 41, and the multiple air inlets 41 are arranged at intervals along the circumferential direction of the stator structure 2, so that cooling air can uniformly enter the interior of the housing 4 from multiple positions on the circumferential side of the housing 4. On the one hand, it improves the uniformity of cooling and temperature reduction inside the housing 4, and on the other hand, it can provide sufficient cooling gas to the interior of the housing 4. Similarly, there are multiple air outlets 42, and the multiple air outlets 42 are arranged at intervals along the circumferential direction of the stator structure 2, so that the gas at the heat exchange port of the stator structure 2 and / or the rotor structure 1 can be discharged to the outside of the housing 4 smoothly and quickly, improving the cooling and temperature reduction efficiency.

[0052] The second end of the end channel 22 and each first radial channel 21 are correspondingly communicated with the air outlet 42 to ensure that the gas after heat exchange with the stator structure 2 is discharged smoothly from the air outlet 42; along the axial direction of the rotor structure 1, the air inlet 41 is located on the side of the winding 3 away from the stator structure 2, so that after the cooling gas enters the interior of the housing from the air inlet 41, it moves along the circumferential direction of the stator structure 2 towards the direction close to the stator structure 2, thereby effectively cooling the axial end of the stator structure 2, that is, the position where the winding 3 is located, to achieve the purpose of cooling and temperature reduction of the winding 3.

[0053] As Figure 5 shown, according to one aspect of the embodiments of the present application, two positioning end plates 43 are provided on the inner circumferential surface of the housing 4. The two positioning end plates 43 are arranged at intervals along the axial direction of the stator structure 2. The stator structure 2 is clamped and positioned between the two positioning end plates 43. The position of the stator structure 2 can be kept fixed through the positioning end plates 43, realizing the positioning connection between the stator structure 2 and the housing.

[0054] A gap 432 is formed between the outer circumferential surface of the stator structure 2 and the inner circumferential surface of the housing 4. Through holes 431 are provided on the end plates, and the through holes 431 are communicated with the gap 432. The gap 432 is communicated with the air outlet 42 provided on the housing 4. In the embodiments of the present application, the cooperation of the through holes 431 and the gap 432 can replace the end channels 22 in the above embodiments, and realize the circulation of the cooling gas outside the winding 3 along the radial direction of the stator structure 2 to cool and temperature-reduce the winding 3.

[0055] As Figure 1 、 Figure 2 and Figure 5As shown, according to one aspect of the embodiments of the present application, a flow guiding ring plate 44 is provided on the inner circumferential surface of the casing 4. The flow guiding ring plate 44 is located between the air inlet 41 and the winding 3, and the outer circumferential surface of the flow guiding ring plate 44 is connected to the inner circumferential surface of the casing 4. A flow guiding channel 45 is formed between the flow guiding ring plate 44 and the winding 3. By providing the flow guiding ring plate 44, after the cooling gas enters the interior of the casing 4, the cooling gas can be guided to move towards the direction close to the rotor structure 1. After the cooling gas reaches the inner edge of the flow guiding ring plate 44, a part of the cooling gas can smoothly flow into the annular channel S, and another part can flow along the flow guiding channel 45 to the outer side of the winding 3 along the radial direction of the stator structure 2 and enter the end channel 22, thereby improving the uniformity of the flow of the cooling gas inside the casing 4.

[0056] Optionally, according to one aspect of the embodiments of the present application, along the axial direction of the stator structure 2, the projection of the inner edge of the flow guiding ring plate 44 falls into the projection of the annular channel S. That is, the inner edge of the flow guiding ring plate 44 corresponds to the connection between the stator structure 2 and the rotor structure 1, and can guide the cooling gas to the central position between the casing 4 and the inner shaft of the rotor, so as to maximize the uniform flow of the cooling gas inside the casing 4.

[0057] As Figure 1 , Figure 2 and Figure 5 shown, according to one aspect of the embodiments of the present application, fans 5 are respectively provided on the axial end faces at both ends of the rotor structure 1. The air outlet sides of the fans 5 face the winding 3 to blow air to the winding 3, so as to provide power for the flow of the cooling gas to the outer side of the winding 3 along the radial direction of the stator structure 2, and ensure the cooling effect on the winding 3.

[0058] As Figure 1 , Figure 2 and Figure 5 shown, according to one aspect of the embodiments of the present application, an axial channel 11 and a plurality of second radial channels 12 are provided inside the rotor structure 1. The axial channel 11 penetrates through the axial end faces at both ends of the rotor structure 1 along the axial direction of the rotor structure 1. The layout of the plurality of second radial channels 12 is similar to that of the plurality of first radial channels 21. One end of the second radial channel 12 is communicated with the axial channel 11, and the other end penetrates through the outer circumferential surface of the rotor structure 1 and is communicated with the annular channel S. After the cooling gas enters the casing 4, a part of the cooling gas can enter each second radial channel 12 along the axial channel 11 and flow into the annular channel S to cool down the rotor structure 1.

[0059] The second radial channels 12 are arranged at intervals along the circumferential and / or axial directions of the rotor structure 1 to ensure the cooling effect on the rotor structure 1.

[0060] The present application also provides a wind power generating set, wherein the wind power generating set includes the generator as described above.

[0061] The generator and wind turbine provided by the embodiment of the present application are configured such that the annular channel S is located radially inside the winding 3 along the stator structure 2, and the annular channel S is communicated with the outer peripheral surface of the stator structure 2 through the first radial channel 21. This allows the cooling gas to flow through the inside of the stator structure 2 in the radial direction of the winding 3 and exchange heat with the winding 3 to cool the winding 3. At the same time, the end channel 22 is located radially outside the winding 3 along the stator structure 2, and the end channel 22 penetrates the outer peripheral surface of the stator structure 2, enabling the cooling gas to flow through the outside of the stator structure 2 in the radial direction of the winding 3 and exchange heat with the winding 3. In this way, the winding 3 can be effectively cooled and its temperature can be reduced, ensuring the normal operation of the generator.

[0062] 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: The generator comprises: Rotor structure (1); A stator structure (2) is sleeved on the outer side of the rotor structure (1), and the rotor structure (1) is capable of rotating relative to the stator structure (2); An annular channel (S) is formed between the stator structure (2) and the rotor structure (1), the annular channel (S) being through-shaped along the axial direction of the stator structure (2), the stator structure (2) being provided with a plurality of first radial channels (21), one end of the first radial channel (21) being in communication with the annular channel (S), and the other end of the first radial channel (21) being through the outer peripheral surface of the stator structure (2); The stator structure (2) is provided with end channels (22) at both ends along the axial direction thereof, a first end of the end channel (22) passes through an end surface of the stator structure (2) in the axial direction, and a second end of the end channel (22) passes through an outer peripheral surface of the stator structure (2); The stator structure (2) is respectively connected to windings (3) at both ends along its axial direction; the annular channel (S) is located on the inner side of the winding (3) along the radial direction of the stator structure (2); and the end channel (22) is located on the outer side of the winding (3) along the radial direction of the stator structure (2).

2. The generator according to claim 1, characterized in that: The stator structure (2) comprises: Stator core (23); Two stator pressing rings (24) are respectively connected to the two ends of the stator core (23) along its axial direction, and the end channel (22) is arranged between the stator pressing ring (24) and the stator core (23). The first end of the end channel (22) passes through the outer peripheral surface of the stator structure (2) at the connection between the stator core (23) and the stator pressing ring (24), and the second end of the end channel (22) passes through the stator pressing ring (24) along the axial direction of the stator structure (2).

3. The generator according to claim 2, characterized in that: The stator pressing ring (24) comprises: The stator slot plate (241) is an annular sheet structure; A plurality of tooth strips (242) are connected to a surface of the stator slot plate (241) on one side facing the stator core (23), the tooth strips (242) are arranged at intervals along the circumference of the stator structure (2), and the tooth strips (242) extend in the radial direction of the stator structure (2), and the end channel (22) is formed between every two adjacent tooth strips (242).

4. The generator according to claim 3, characterized in that: A plurality of ventilation slots (2411) are recessed at the inner edge of the stator slot plate (241), one ventilation slot (2411) is provided between every two adjacent tooth strips (242), and the ventilation slots (2411) are connected to the end channels (22) in a one-to-one correspondence.

5. The generator according to claim 1, characterized in that: The generator comprises a casing (4), the stator structure (2) and the rotor structure (1) are both arranged on the inner side of the casing (4); an air inlet (41) and an air outlet (42) are provided on the casing (4), the second end of the end channel (22) and each of the first radial channels (21) are correspondingly connected to the air outlet (42); along the axial direction of the rotor structure (1), the air inlet (41) is located on a side of the winding (3) away from the stator structure (2).

6. The generator according to claim 5, characterized in that: Two positioning end plates (43) are provided on the inner circumferential surface of the casing (4), and the two positioning end plates (43) are spaced apart along the axial direction of the stator structure (2). The stator structure (2) is clamped and located between the two positioning end plates (43), and a gap (432) is formed between the outer circumferential surface of the stator structure (2) and the inner circumferential surface of the casing (4). A through hole (431) is opened on the end plate, and the through hole (431) is connected to the gap (432).

7. The generator according to claim 5, characterized in that: A guide ring plate (44) is provided on the inner circumference of the casing (4); the guide ring plate (44) is located between the air inlet (41) and the winding (3); the outer circumference of the guide ring plate (44) is connected to the inner circumference of the casing (4); and a guide channel (45) is formed between the guide ring plate (44) and the winding (3).

8. The generator according to claim 7, characterized in that: Along the axial direction of the stator structure (2), the projection of the inner edge of the guide ring plate (44) falls into the projection of the annular channel (S).

9. The generator according to claim 1, characterized in that: Fans (5) are respectively provided on the end surfaces at both axial ends of the rotor structure (1), and the air outlet side of the fan (5) faces the winding (3).

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises the generator according to any one of claims 1 to 9.

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