Cooling structure for semi-direct-driven wind driven generator

Abstract

The utility model relates to a cooling structure for a semi-direct-driven wind driven generator, which comprises a stator base and a plurality of coolers, the stator base is provided with an inner cavity for accommodating a stator assembly and a rotor assembly of the generator, and the plurality of coolers are uniformly and fixedly arranged on the stator base along the circumferential direction and are communicated with the inner cavity of the stator base. Two annular limiting rib plates are oppositely arranged on the inner wall of an inner cavity of the stator base, and a plurality of vent hole sets are evenly formed in the plate body of each annular limiting rib plate in the circumferential direction. According to the technical scheme, the structure is reasonable, diagonal circulation can be achieved, the cooling flow field is optimized, the problem of non-uniformity of a traditional cooling mode is solved, the heat exchange power of a single cooler module can be reduced, and therefore the module size is reduced, and the cabin space layout is optimized.

Description

Technical Field

[0001] The utility model relates to a generator device, in particular to a cooling structure for a semi-direct drive wind turbine generator. Background Art

[0002] With the progress of wind power technology, the capacity of wind turbine generators has been continuously increasing. Semi-direct drive wind turbine generators are the mainstream of high-power offshore wind turbine generators. The harsh offshore environment places higher requirements on the cooling device. Currently, there are two design schemes for offshore cooling systems: 1. Water jacket cooling structure: In this structure, the cooling air duct and the water jacket occupy a relatively large radial area of the generator armature part. On the premise that the basic parameters of the wind turbine generator, such as the overall outer diameter size, power, and speed, are determined, the generator needs to be made longer and thinner to meet the power output requirements of the whole machine. However, the long and thin generator size structure will lead to an increase in the load intensity requirements for the whole machine's transmission chain and tower barrel, and the transportation and hoisting difficulty of the whole machine will increase; in addition, for a wind turbine generator using a water jacket cooling structure, once a fault such as coolant leakage occurs during operation in the wind farm, since the water jacket is built into the generator, it cannot be repaired; 2. Backpack type air-water cooling structure: This structure is relatively simple. A set of cooling modules is installed on the top of the generator, and the axial and radial ventilation are combined to form a single cycle. To achieve the cooling effect, a single cooling module will be higher and larger, occupying the internal space of the nacelle and being inconvenient for maintenance and repair; in addition, there will also be a problem of uneven cooling. Summary of the Invention

[0003] To solve the above technical problems, the purpose of the utility model is to provide a cooling structure for a semi-direct drive wind turbine generator, including a stator frame and a plurality of coolers. The stator frame has an inner cavity for accommodating the stator assembly and the rotor assembly of the generator. The plurality of coolers are evenly fixed on the stator frame along the circumferential direction and are connected to the inner cavity of the stator frame. Two annular limiting rib plates are oppositely arranged on the inner wall of the inner cavity of the stator frame, and a plurality of ventilation hole groups are evenly formed along the circumferential direction on the plate body of each annular limiting rib plate.

[0004] Preferably, the two annular limiting rib plates form a limiting cooling intermediate cavity in the inner cavity of the stator frame, and a plurality of ventilation hole groups of each annular limiting rib plate are connected to the limiting cooling intermediate cavity.

[0005] Preferably, a plurality of positioning and mating surfaces for installing dry coolers are evenly arranged on the outer peripheral surface of the stator frame along the circumferential direction. The stator frame is provided with air hole groups at each positioning and mating surface, and the cooler is connected to the inner cavity of the stator frame through the air hole groups 7.

[0006] Preferably, each air hole group includes an air outlet hole and an air inlet hole. The front and rear ends of the air outlet hole are respectively provided with air inlet holes. Both the air outlet hole and the air inlet hole are communicated with the inner cavity of the stator frame. The air inlet hole is located between two annular limiting rib plates, and the two groups of air inlet holes are respectively located on the sides of the corresponding annular limiting rib plates.

[0007] Preferably, the number of coolers is four, and two coolers form a group. The front and rear ends of the stator frame include an NE drive end and an NDE non-drive end. One group of coolers is arranged towards the NE drive end, and the other group of coolers is arranged towards the NDE non-drive end, that is, the two groups of coolers are arranged oppositely.

[0008] Preferably, the two ends of the stator frame are respectively provided with a rear end cover sealing plate assembly and a semi-direct drive gearbox assembly.

[0009] By means of the above solution, the utility model has at least the following advantages:

[0010] The technical solution of this application adopts a "2 + 2" layout form, with two cooler modules distributed at the NDE end and the DE end of the stator frame respectively, and they are opposite to each other in pairs. At the same time, it is combined with the evenly distributed ventilation hole groups in the inner rib plates of the stator frame, so that diagonal circulation can be realized, optimizing the cooling flow field. The technical solution of this application solves the non-uniformity of the traditional cooling method, and can reduce the heat exchange power of a single cooler module, thereby reducing the module volume and optimizing the spatial layout of the nacelle.

[0011] The above description is only an overview of the technical solution of the utility model. In order to be able to understand the technical means of the utility model more clearly and implement it according to the content of the description, the following takes the preferred embodiment of the utility model and combines with the attached drawings to explain in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show a certain embodiment of the utility model, so it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0013] Figure 1 is a three-dimensional structural schematic diagram of a cooling structure for a semi-direct drive wind turbine of this application;

[0014] Figure 2 is another three-dimensional structural schematic diagram of a cooling structure for a semi-direct drive wind turbine of this application;

[0015] Figure 3 is a three-dimensional structural schematic diagram of the stator frame of this application;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structural relationship between the stator frame and the cooler of the present application;

[0017] Figure 5 It is a schematic cross-sectional structure diagram of a cooling structure for a semi-direct-drive wind turbine of the present application.

[0018] In the figure: 1 stator frame, 2 cooler, 3 annular limiting rib plate, 4 ventilation hole group, 5 limiting cooling intermediate cavity, 6 positioning mating surface, 7 air hole group, 8 air outlet hole, 9 air inlet hole, 10 rear end cover sealing plate assembly, 11 semi-direct-drive gearbox assembly. Specific embodiments

[0019] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0020] See Figures 1 to 5 , a cooling structure for a semi-direct-drive wind turbine according to a preferred embodiment of the present utility model, includes a stator frame 1 and a plurality of coolers 2. The stator frame 1 has an inner cavity for accommodating the stator assembly and the rotor assembly of the generator. The plurality of coolers 2 are uniformly fixed on the stator frame 1 along the circumferential direction and are communicated with the inner cavity of the stator frame 1. Two annular limiting rib plates 3 are oppositely arranged on the inner wall of the inner cavity of the stator frame 1. A plurality of ventilation hole groups 4 are uniformly arranged along the circumferential direction on the plate body of each annular limiting rib plate 3.

[0021] Preferably, the two annular limiting rib plates 3 form a limiting cooling intermediate cavity 5 in the inner cavity of the stator frame 1, and the plurality of ventilation hole groups 4 of each annular limiting rib plate 3 are communicated with the limiting cooling intermediate cavity 5.

[0022] Preferably, a plurality of positioning mating surfaces 6 for installing the dry cooler 2 are uniformly arranged along the circumferential direction on the outer peripheral surface of the stator frame 1. The stator frame 1 is provided with an air hole group 7 at each positioning mating surface 6, and the cooler 2 is communicated with the inner cavity of the stator frame 1 through the air hole group 7.

[0023] Preferably, each air hole group 7 includes an air outlet hole 8 and an air inlet hole 9. The front and rear ends of the air outlet hole 8 are respectively provided with an air inlet hole 9. The air outlet hole 8 and the air inlet hole 9 are both communicated with the inner cavity of the stator frame 1, and the air inlet hole 9 is located between the two annular limiting rib plates 3. The two groups of air inlet holes 9 are respectively located on the sides of the corresponding annular limiting rib plates 3.

[0024] Preferably, the number of coolers 2 is four, and two coolers 2 are in a group. The front and rear ends of the stator frame 1 include the NE drive end and the NDE non-drive end. One group of coolers 2 is arranged towards the NE drive end, and the other group of coolers 2 is arranged towards the NDE non-drive end, that is, the two groups of coolers 2 are arranged oppositely.

[0025] Preferably, both ends of the stator frame 1 are respectively provided with a rear end cover sealing plate assembly 10 and a semi-direct drive gearbox assembly 11.

[0026] The technical solution of this application adopts a "2 + 2" layout form, that is, there are two groups of coolers 2 respectively responsible for cooling the NDE end winding and the DE end winding. At the same time, these two groups of coolers 2 are installed oppositely. Also, because of the ventilation hole group 4 of the annular limiting rib plate 3, the two relatively installed coolers 2 can be linked to achieve diagonal circulation, so as to relatively ensure the cooling uniformity. Specifically:

[0027] As attached Figure 5 As shown, when the two oppositely arranged coolers 2 are working, while forming two air paths in the inner cavity of the stator frame 1, relying on the mutual influence of the two air paths, the cooler 2 in the upper left corner can send cooling air into the inner cavity of the stator frame 1 through the air inlet hole 9. The cooling air enters the limiting cooling intermediate cavity 5 through the rotor bracket of the rotor assembly to cool down the rotor assembly and the stator assembly, and then is extracted by the cooler 2 in the upper left corner through the upper air outlet hole 8. At this time, it is the basic cooling air path. Similarly, the cooler 2 in the lower right corner can also send cooling air through the air outlet hole 8. Part of the cooling air can flow upstream until it reaches the ventilation hole group 4. Through the ventilation hole group 4, the cooling air can enter the limiting cooling intermediate cavity 5 and be extracted by the cooler 2 in the upper left corner. In this way, when the upper cooler 2 extracts air, it affects the lower cooler 2, forming a negative pressure, making the cooling air path of the entire motor more comprehensive and the cooling effect better.

[0028] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cooling structure for a semi-direct drive wind turbine generator, characterized in that: The invention comprises a stator base (1) and a plurality of coolers (2), wherein the stator base (1) has an inner cavity for accommodating a stator assembly and a rotor assembly of the generator, the plurality of coolers (2) are evenly fixedly mounted on the stator base (1) along the circumferential direction and are connected to the inner cavity of the stator base (1), two annular limiting rib plates (3) are arranged opposite to each other on the inner wall of the inner cavity of the stator base (1), and each annular limiting rib plate (3) has a plurality of ventilation hole groups (4) evenly opened along the circumferential direction on the plate body.

2. A cooling structure for a semi-direct drive wind turbine generator according to claim 1, characterized in that: Two annular limiting rib plates (3) form a limiting cooling intermediate cavity (5) in the inner cavity of the stator frame (1), and a plurality of ventilation hole groups (4) of each annular limiting rib plate (3) are connected to the limiting cooling intermediate cavity (5).

3. A cooling structure for a semi-direct drive wind turbine generator according to claim 1, characterized in that: The outer peripheral surface of the stator base (1) is evenly provided with a plurality of positioning matching surfaces (6) for mounting the dry cooler (2) along the circumferential direction. The stator base (1) is provided with an air hole group (7) on each positioning matching surface (6). The cooler (2) is connected to the inner cavity of the stator base (1) through the air hole group (7).

4. A cooling structure for a semi-direct drive wind turbine generator according to claim 3, characterized in that: Each air hole group (7) comprises an air outlet hole (8) and an air inlet hole (9), and the air outlet hole (8) has an air inlet hole (9) at both the front and rear ends, and the air outlet hole (8) and the air inlet hole (9) are both connected to the inner cavity of the stator base (1), and the air inlet hole (9) is located between two annular limiting rib plates (3), and the two groups of air inlet holes (9) are respectively located on the side edges of the corresponding annular limiting rib plates (3).

5. A cooling structure for a semi-direct drive wind turbine generator according to claim 1 or 2 or 3 or 4, characterized in that: The number of coolers (2) is four, and two coolers (2) form a group. The front and rear ends of the stator frame (1) include an NE drive end and an NDE non-drive end. One group of coolers (2) is arranged toward the NE drive end, and the other group of coolers (2) is arranged toward the NDE non-drive end, that is, the two groups of coolers (2) are arranged opposite to each other.

6. A cooling structure for a semi-direct drive wind turbine generator according to claim 1, characterized in that: The two ends of the stator base (1) are respectively provided with a rear end cover sealing plate assembly (10) and a semi-direct drive gear box assembly (11).

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