Air cooling base structure of wind driven generator

Abstract

The utility model discloses a wind driven generator air cooling machine base structure which comprises a machine base, a plurality of first air inlets and second air inlets which are alternately arranged are evenly formed in the driving end of the machine base in the circumferential direction, and a plurality of third air inlets and fourth air inlets which are alternately arranged are evenly formed in the non-driving end of the machine base in the circumferential direction. The inner side of the driving end and the inner side of the non-driving end of the machine base are provided with a plurality of first drainage air channels and a plurality of second drainage air channels correspondingly, the air inlet ends of the first drainage air channels communicate with the second air inlets correspondingly, and the air inlet ends of the second drainage air channels communicate with the fourth air inlets correspondingly. The air outlet ends of the first drainage air duct and the second drainage air duct are oppositely arranged in the axial direction; a plurality of first air outlets are evenly formed in the middle of the machine base in the circumferential direction. According to the utility model, the air is kept uniform in the circumferential direction when being discharged into and out of the base, and the air can flow along the axial direction, so that the circumferential temperature difference and the axial temperature difference can be reduced, and the heat dissipation performance of the wind driven generator can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine technology, and in particular relates to a wind turbine air-cooled frame structure. Background Technology

[0002] Currently, most wind turbine generators on the market use liquid cooling or a combination of liquid and air cooling to cool large-capacity wind turbines such as semi-direct-drive permanent magnet wind turbines. However, liquid cooling requires complex cooling equipment and is prone to leaks and blockages, reducing the reliability of the wind turbine. Furthermore, existing air-cooling structures may create dead air zones or other poorly heated areas inside the wind turbine, leading to problems such as large circumferential and axial temperature differences and uneven temperature control in semi-direct-drive permanent magnet wind turbines. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides an air-cooled frame structure for wind turbine generators, which can improve the heat dissipation performance of wind turbine generators.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A wind turbine air-cooled frame structure includes a frame. The drive end of the frame has a plurality of alternating first and second air inlets evenly arranged circumferentially. The non-drive end of the frame has a plurality of alternating third and fourth air inlets evenly arranged circumferentially. The inner sides of the drive end and the inner sides of the non-drive end of the frame are respectively provided with a plurality of first and second air ducts. The air inlets of the first air ducts are connected to the plurality of second air inlets, and the air inlets of the second air ducts are connected to the plurality of fourth air inlets. The air outlets of the first and second air ducts are axially opposite to each other. A plurality of first air outlets are evenly arranged circumferentially in the middle of the frame.

[0006] The beneficial effects of adopting the above technical solution are as follows: Cooling air can be uniformly introduced into the inner side of the drive end and non-drive end of the frame from multiple first air inlets and multiple third air inlets in the circumferential direction to uniformly cool the end coils of the drive end and non-drive end of the wind turbine generator, and then flow to the rotor to dissipate heat from the rotor; Cooling air can also flow uniformly to the rotor from multiple second air inlets through the first air duct in the circumferential direction, and cooling air can also flow uniformly to the rotor from multiple fourth air inlets through the second air duct in the circumferential direction to enhance rotor heat dissipation; After passing through the rotor, the cooling air flows axially into the air gap, and then flows into the radial air duct of the iron core to cool the iron core and coil bars, and finally is uniformly discharged from the frame from multiple first air outlets in the circumferential direction, thereby completing the heat dissipation of the wind turbine generator; Among them, the air intake and exhaust are uniform in the circumferential direction, and the air can flow in the axial direction, which helps to reduce the circumferential temperature difference and the axial temperature difference, thereby helping to control the temperature uniformity and thus improving the heat dissipation performance of the wind turbine generator.

[0007] Furthermore, an annular air cavity communicating with all the first air outlets is provided on the outer side of the middle part of the base, and several second air outlets for connecting to the input end of the ventilation fan are provided on the outer side of the annular air cavity.

[0008] The beneficial effects of adopting the above technical solution are as follows: the fan can provide negative pressure so that the air inside the middle of the base can enter the annular air cavity evenly from multiple first air outlets and be discharged from the second air outlet.

[0009] Furthermore, an air duct cover is fixedly connected to the outer side of the base along the circumference, forming an annular air cavity between the air duct cover and the base.

[0010] Furthermore, a second air outlet is provided on the duct cover.

[0011] Furthermore, the fan is a centrifugal fan.

[0012] Furthermore, the axial position of the first air outlet matches the axial installation position of the iron core.

[0013] The beneficial effect of adopting the above technical solution is that this setting ensures that the air discharged from the first air outlet can cool the iron core.

[0014] Furthermore, both the first and third air inlets are radially through-hole mounted on the base.

[0015] The beneficial effects of adopting the above technical solution are as follows: This arrangement allows cooling air to flow radially towards the end coil of the wind turbine's drive end and the end coil of the wind turbine's non-drive end.

[0016] Furthermore, the radial positions of the air outlets of the first and second air ducts are matched with the radial positions of the rotor.

[0017] The beneficial effects of adopting the above technical solution are as follows: This arrangement allows the air flowing out from the first and second air ducts to flow towards the rotor, so as to cool the rotor.

[0018] Furthermore, the drive end face of the base is sealed to the gearbox, and the non-drive end face of the base is sealed to the outlet box cover.

[0019] The beneficial effects of adopting the above technical solution are as follows: This configuration ensures that air can only enter the wind turbine through the first air inlet, the second air inlet, the third air inlet, and the fourth air inlet, and can only flow out of the wind turbine through the first air outlet.

[0020] Furthermore, both the drive end and non-drive end of the base are provided with stiffening plates for connecting the iron core pressure ring.

[0021] The beneficial effects of adopting the above technical solution are as follows: the stiffening plate connecting the iron core pressure ring can prevent the air entering from the first air inlet and the third air inlet from flowing directly to the middle of the frame, so as to ensure that the air can first cool the end coil of the wind turbine drive end and the end coil of the wind turbine non-drive end respectively.

[0022] The beneficial effects of this utility model are as follows:

[0023] Cooling air can be uniformly introduced into the inner side of the drive end and non-drive end of the frame from multiple first air inlets and multiple third air inlets in the circumferential direction to uniformly cool the end coils of the drive end and non-drive end of the wind turbine generator, respectively. Then it flows to the rotor to dissipate heat from the rotor. Cooling air can also flow uniformly to the rotor from multiple second air inlets through the first air duct in the circumferential direction, and cooling air can also flow uniformly to the rotor from multiple fourth air inlets through the second air duct in the circumferential direction to enhance rotor heat dissipation. After passing through the rotor, the cooling air flows axially into the air gap, and then into the radial air duct of the iron core to cool the iron core and coil bars. Finally, it is uniformly discharged from the frame from multiple first air outlets in the circumferential direction, thus completing the heat dissipation of the wind turbine generator. The air intake and exhaust are uniform in the circumferential direction, and the air can flow axially. This helps to reduce the circumferential temperature difference and the axial temperature difference, thereby helping to control the temperature uniformity and thus improving the heat dissipation performance of the wind turbine generator. Attached Figure Description

[0024] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0025] in:

[0026] Figure 1 A schematic diagram of the structure of this utility model is shown;

[0027] Figure 2 The front view of this utility model is shown;

[0028] Figure 3 Showing Figure 2 Sectional view at point AA;

[0029] Figure 4 Showing Figure 2 Sectional view at point BB;

[0030] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0031] Figure label:

[0032] 1-Base, 2-First air inlet, 3-Second air inlet, 4-Third air inlet, 5-Fourth air inlet, 6-First air duct, 7-Second air duct, 8-First air outlet, 9-Annular air cavity, 10-Second air outlet, 11-Air duct cover, 12-Firming plate. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] This utility model provides a wind turbine air-cooled frame structure, such as Figure 1-4 As shown, it includes a base 1. The driving end of the base 1 is uniformly provided with a plurality of alternating first air inlets 2 and second air inlets 3 along the circumference. The non-driving end of the base 1 is uniformly provided with a plurality of alternating third air inlets 4 and fourth air inlets 5 along the circumference. The inner side of the driving end and the inner side of the non-driving end of the base 1 are respectively provided with a plurality of first air diversion ducts 6 and a plurality of second air diversion ducts 7. The air inlet ends of the plurality of first air diversion ducts 6 are respectively connected to the plurality of second air inlets 3. The air inlet ends of the plurality of second air diversion ducts 7 are respectively connected to the plurality of fourth air inlets 5. The air outlet ends of the first air diversion ducts 6 and the second air diversion ducts 7 are axially opposite to each other. The middle part of the base 1 is uniformly provided with a plurality of first air outlets 8 along the circumference.

[0035] Understandably, cooling air can be uniformly introduced into the inner side of the drive end and non-drive end of the frame 1 from multiple first air inlets 2 and multiple third air inlets 4 in the circumferential direction to uniformly cool the end coils of the drive end and non-drive end of the wind turbine generator, respectively. Then, it flows to the rotor to dissipate heat from the rotor. Cooling air can also flow uniformly to the rotor from multiple second air inlets 3 through the first air duct 6 in the circumferential direction, and cooling air can also flow uniformly to the rotor from multiple fourth air inlets 5 through the second air duct 7 in the circumferential direction to enhance rotor heat dissipation. After passing through the rotor, the cooling air flows axially into the air gap, then into the radial air duct of the iron core to cool the iron core and coil bars. Finally, it is uniformly discharged from the frame 1 from multiple first air outlets 8 in the circumferential direction, thus completing the heat dissipation of the wind turbine generator. Among these, the air intake and exhaust are uniform in the circumferential direction, and the air can flow axially. This helps to reduce the circumferential temperature difference and the axial temperature difference, thereby helping to control the temperature uniformity, which in turn helps to improve the heat dissipation performance of the wind turbine generator and ensures that the wind turbine generator does not experience over-temperature failure.

[0036] In one embodiment, an annular air cavity 9 is provided on the outer side of the middle part of the base 1, which is connected to all the first air outlets 8. Two second air outlets 10 are provided on the outer side of the annular air cavity 9, and each second air outlet 10 is connected to a fan; wherein the fan is a centrifugal fan.

[0037] Understandably, the fan can provide negative pressure so that air from the inner side of the middle of the base 1 enters the annular air cavity 9 evenly from multiple first air outlets 8 and is discharged from the second air outlet 10.

[0038] In one embodiment, an air duct cover 11 is fixedly connected to the outer side of the base 1 along the circumferential direction, and an annular air cavity 9 is formed between the air duct cover 11 and the base 1.

[0039] In one embodiment, a second air outlet 10 is provided on the duct cover 11.

[0040] In one embodiment, the axial position of the first air outlet 8 is matched with the axial installation position of the iron core to ensure that the air discharged from the first air outlet 8 can cool the iron core.

[0041] In one embodiment, both the first air inlet 2 and the third air inlet 4 are radially through-hole disposed on the base 1 so that cooling air flows radially to the end coil of the wind turbine's drive end and the end coil of the wind turbine's non-drive end.

[0042] In one embodiment, the radial positions of the air outlets of the first air duct 6 and the second air duct 7 are matched with the radial position of the rotor so that the air flowing out from the first air duct 6 and the second air duct 7 can flow to the rotor to cool it.

[0043] In one embodiment, the drive end face of the base 1 is sealed to the gearbox, and the non-drive end face of the base 1 is sealed to the outlet box cover, so that air can only enter the wind turbine through the first air inlet 2, the second air inlet 3, the third air inlet 4 and the fourth air inlet 5, and can only flow out of the wind turbine through the first air outlet 8.

[0044] In one embodiment, the base 1 is provided with stiffening plates 12 for connecting the iron core pressure ring in both the driving end and the non-driving end.

[0045] Understandably, the stiffener 12 connects to the iron core pressure ring, which can prevent the air entering from the first air inlet 2 and the third air inlet 4 from flowing directly to the middle of the base 1, so as to ensure that the air can first cool the end coil of the wind turbine's drive end and the end coil of the wind turbine's non-drive end respectively.

[0046] The working process of this utility model is as follows:

[0047] Start the fan to create negative pressure inside the annular air chamber 9;

[0048] Under the negative pressure within the annular air cavity 9, air can enter the base 1 from multiple first air inlets 2 circumferentially distributed at the drive end and multiple third air inlets 4 circumferentially distributed at the non-drive end of the base 1, respectively, and cool the end coils at the drive end and the end coils at the non-drive end of the wind turbine generator, before flowing to the rotor to cool the rotor; under the negative pressure within the annular air cavity 9, air can also enter multiple first air ducts 6 and multiple second air ducts 7 through multiple second air inlets 3 circumferentially distributed at the drive end and multiple fourth air inlets 5 circumferentially distributed at the non-drive end of the base 1, respectively, before flowing to the rotor to cool the rotor;

[0049] After the air flows through the rotor, it flows axially into the air gap, then into the radial air duct of the iron core and cools the iron core and the bar. Then it is discharged into the annular air cavity 9 from multiple first air outlets 8 evenly distributed in the middle of the frame 1, and finally discharged from the second air outlet 10 by the fan to complete the pure air cooling of the entire wind turbine.

[0050] In summary, this utility model has a simple structure, is easy to manufacture, is highly practical, and is conducive to large-scale promotion and application. This utility model only requires an external fan to drive air to achieve all-round cooling of the wind turbine through axial and radial ventilation, which has low implementation cost and good effect.

[0051] This utility model has no complex internal flow channels. It achieves a reasonable planning of the air flow path through the structure of stiffening plate 12, first air duct 6, second air duct 7 and air duct cover plate 11. It enhances the cooling of the stator and rotor of the wind turbine generator, avoids the risk of leakage and other failures, and can stably and reliably dissipate heat for large-capacity wind turbine generators such as semi-direct drive permanent magnet wind turbine generators.

[0052] This utility model has a compact structure, which can reduce manufacturing costs and meet the rigidity requirements of wind turbines.

[0053] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0054] While specific embodiments of the present invention have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A wind turbine air-cooled frame structure, characterized in that, The device includes a base (1), on which a plurality of alternating first air inlets (2) and second air inlets (3) are uniformly arranged circumferentially at the driving end, and a plurality of alternating third air inlets (4) and fourth air inlets (5) are uniformly arranged circumferentially at the non-driving end; a plurality of first air ducts (6) and a plurality of second air ducts (7) are respectively arranged on the inner side of the driving end and the inner side of the non-driving end of the base (1), the air inlet ends of the plurality of first air ducts (6) are respectively connected to the plurality of second air inlets (3), the air inlet ends of the plurality of second air ducts (7) are respectively connected to the plurality of fourth air inlets (5), and the air outlet ends of the first air ducts (6) and the second air ducts (7) are axially opposite to each other; a plurality of first air outlets (8) are uniformly arranged circumferentially at the middle part of the base (1).

2. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The outer side of the middle part of the base (1) is provided with an annular air cavity (9) that communicates with all the first air outlets (8). The outer side of the annular air cavity (9) is provided with a plurality of second air outlets (10) for connecting to the input end of the ventilation fan.

3. The wind turbine air-cooled frame structure according to claim 2, characterized in that, A duct cover plate (11) is fixedly connected to the outer side of the base (1) along the circumferential direction, and the duct cover plate (11) and the base (1) form the annular air cavity (9).

4. The wind turbine air-cooled frame structure according to claim 3, characterized in that, The second air outlet (10) is provided on the air duct cover (11).

5. The wind turbine air-cooled frame structure according to claim 2, characterized in that, The fan is a centrifugal fan.

6. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The axial position of the first air outlet (8) matches the axial installation position of the iron core.

7. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The first air inlet (2) and the third air inlet (4) are both radially through the base (1).

8. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The radial positions of the air outlets of the first air duct (6) and the second air duct (7) are matched with the radial positions of the rotor.

9. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The drive end face of the base (1) is sealed to the gearbox, and the non-drive end face of the base (1) is sealed to the outlet box cover.

10. The wind turbine air-cooled frame structure according to claim 1, characterized in that, The base (1) is provided with stiffening plates (12) for connecting the iron core pressure ring in both the driving end and the non-driving end.

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