Stator base for cooling stator of high-altitude long-iron-core permanent magnet wind power motor in partitioned manner

Abstract

The invention discloses a high-altitude long-iron-core permanent magnet wind power motor stator partition cooling stator frame, and belongs to the technical field of permanent magnet direct drive wind power motors. The first ventilation pipeline communicates with the first pressure equalizing cavity, and the first pressure equalizing cavity communicates with the non-driving end air outlet space and communicates with the fifth space; the second ventilation pipeline communicates with the third pressure equalizing cavity, the driving end air outlet space communicates with the third space, and the third space communicates with the fifth space; the third ventilation pipeline communicates with the second pressure equalizing cavity, communicates with the air inlet cavity and communicates with the first air outlet cavity and the second air outlet cavity. The first air outlet cavity communicates with the first space, the second space and the fifth space; the second air outlet cavity communicates with the second space and the fifth space, and the three cooling paths converge into the fifth space and communicate with the air outlet pipeline. According to the invention, the three cooling air channels of the wind power motor are constructed, so that the air volume difference of the stator iron core ventilating channels can be greatly reduced, each iron core section and the stator coil at each iron core section can be cooled by sufficient air, and the cooling effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnet direct-drive wind turbines, and specifically relates to a stator base with zoned cooling of a stator of a high-altitude long iron core permanent magnet wind turbine. The invention relates to a stator base with zoned cooling of a stator of a high-altitude long iron core permanent magnet wind turbine. Background Art

[0002] The speed of low-speed permanent magnet wind turbine motor is low, only about 10r / min, and the pressure generated by the rotating parts is only a few Pa, which cannot drive the air to flow inside the motor to remove the loss of motor operation. Generally, a special fan is used as the main pressure source for air flow. For large-capacity permanent magnet low-speed wind turbine motors, the iron core is longer, and the iron core radial ventilation method is adopted. After the cooling air passes through the stator, it enters the air gap and diffuses to both ends of the iron core. Finally, through the stator winding end and the ventilation duct, the iron core is longer, and the ventilation path for the part that directly cools the stator is long. In addition, due to structural limitations, it is generally impossible to evenly arrange the fan around the base. As a result, due to the uneven circumferential temperature distribution of the stator coil and the iron core, the circumferential temperature difference can reach 30K-40K, which makes it difficult to further increase the electromagnetic load and affect the economic efficiency of the motor. Especially for high-altitude large-capacity permanent magnet low-speed wind turbine motors, the low air density further limits the increase of the motor electromagnetic load.

[0003] In the prior art, a stator coil and a long iron core are used. A Chinese invention patent: a wind turbine, disclosed in application publication number CN102332780A, is provided with a rotor and a stator frame that cooperate with each other, and a circular annular air gap is formed between the rotor and the stator frame, characterized in that: a circle of annular groove bodies are provided on the outer circumferential surface of the stator frame, baffles are provided on both sides of the annular groove body, and vertical rib plates are provided inside along the axial direction of the stator, dividing the annular groove body into a plurality of ventilation cavities, which are cold air cavities or hot air cavities, and the cold air cavities and the hot air cavities are alternately arranged on the outer circumferential surface of the stator frame, and the bottoms thereof are respectively connected with cold air inlet ducts and hot air outlet ducts.

[0004] The above technologies have the following problems: 1. The above-mentioned existing wind turbines are further limited in their electromagnetic load increase due to the low air density in high altitude areas.

[0005] 2. The temperature of the cooling air gradually increases due to the heat generated by the stator core, stator coil, and rotor magnetic steel, and the cooling effect on the stator end is not significant.

[0006] 3. The cooling air enters the air inlet cavity from the large cavity. Due to the small radial size of the air inlet cavity, the wind resistance is large and the amount of cooling air entering is small. On the one hand, the amount of air in direct contact with the stator core is small, and the heat exchange is insufficient. On the other hand, when the cooling air flows from one end of the air inlet cavity to the other end, it is affected by the heat generated by the stator core and the stator coil. The cooling air temperature gradually increases, resulting in uneven cooling of each section of the stator core and low cooling efficiency. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned existing problems and to provide a stator frame with zoned cooling of the stator of a high-altitude long-core permanent magnet wind turbine motor, so as to achieve the purpose of effectively cooling the direct-drive wind turbine in plateau areas.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A stator frame for high-altitude long-core permanent magnet wind turbine stator zone cooling, characterized by: comprising a first space, a second space, a third space, a non-driving end air outlet space, a fifth space, a driving end air outlet space, a first pressure equalizing cavity, a second pressure equalizing cavity, a third pressure equalizing cavity, an air inlet cavity, a first air outlet cavity, and a second air outlet cavity in the stator frame; a first ventilation duct, a second ventilation duct, and a third ventilation duct for allowing cooling air to enter the frame, and an air outlet duct for discharging cooling air; First partition cooling path: the first ventilation duct is connected to the first pressure equalizing cavity, the first pressure equalizing cavity is connected to the non-driving end air outlet space, and the non-driving end air outlet space is connected to the fifth space; Second partition cooling path: the second ventilation duct is connected to the third pressure equalizing chamber, the third pressure equalizing chamber is connected to the drive end air outlet space, the drive end air outlet space is connected to the third space, and the third space is connected to the fifth space; Third partition cooling path: the third ventilation duct is connected to the second pressure equalizing chamber, the second pressure equalizing chamber is connected to the air inlet chamber, the air inlet chamber is connected to the first air outlet chamber and the second air outlet chamber; the first air outlet chamber is connected to the first space, the first space is connected to the second space, the second space is connected to the fifth space; the second air outlet chamber is connected to the second space, the second space is connected to the fifth space; The fifth space is connected to the air outlet duct.

[0009] The first space is surrounded by a support ring plate, a sixth ring plate and a conical ring plate, the second space is surrounded by a support ring plate, a fifth ring plate, a seventh ring plate and an eighth ring plate, the third space is surrounded by a support ring plate, a fifth ring plate, an eighth ring plate and a ninth ring plate, the fifth space is surrounded by an eleventh ring plate, a fifth ring plate, a twelfth ring plate and a thirteenth ring plate, a circumferentially distributed first ventilation hole is arranged on the support ring plate located in the first space and the second space to connect the first space with the second space, the eighth ventilation hole arranged on the support ring plate connects the drive end air outlet space and the third space, the tenth ventilation hole is arranged on the fifth ring plate to connect the tenth ventilation hole The second space and the fifth space, the eleventh ventilation hole is arranged on the fifth ring plate to connect the third space and the fifth space, the twelfth ventilation hole on the eleventh ring plate connects the non-drive end air outlet space and the fifth space, the second ventilation holes are arranged at intervals on the support ring plate to connect the first cavity and the second cavity, the ninth ventilation holes are evenly arranged on the circumference of the fourth ring plate to connect the second cavity and the second equalizing pressure cavity, the third ventilation holes and the fourth ventilation holes are respectively arranged on the sixth ring plate and the seventh ring plate along the circumference, and are only distributed at the circumferential positions corresponding to the air outlet cavities, so that the first air outlet cavity is connected to the first space, and the second air outlet cavity is connected to the second space.

[0010] The air inlet cavity is divided into a first cavity and a second cavity. The first cavity is surrounded by a second ring plate, a support ring plate, a sixth ring plate and a plurality of rib plates on the circumference to form the outer periphery of the stator base; the second cavity is surrounded by a support ring plate, a seventh ring plate, a fourth ring plate and a plurality of rib plates, and the number of rib plates evenly distributed on the circumference is the same as that of the first cavity. The positions of the first cavity and the second cavity on the circumference correspond to each other, and are separated from each other by the support ring plate; the air outlet cavity is divided into a first air outlet cavity and a second air outlet cavity by the support ring plate, and the air inlet cavity and the air outlet cavity are evenly spaced around the circumference.

[0011] The first pressure equalizing chamber is surrounded by the fifth ring plate, the fourth ring plate and the tenth ring plate, the second pressure equalizing chamber is surrounded by the fifth ring plate, the fourth ring plate, the seventh ring plate and the tenth ring plate, and the third pressure equalizing chamber is surrounded by the first ring plate, the second ring plate and the conical ring plate; the first pressure equalizing chamber and the second pressure equalizing chamber are arranged between the fourth ring plate and the fifth ring plate.

[0012] The first ventilation duct passes through the support ring plate to open a fifth ventilation hole on the circumference to connect to the first pressure equalizing chamber; the third ventilation duct passes through the support ring plate to open a sixth ventilation hole on the circumference to connect to the second pressure equalizing chamber; the second ventilation duct passes through the seventh ventilation hole evenly opened on the second ring plate, the support ring plate and the fourth ring plate to connect to the third pressure equalizing chamber.

[0013] The outer periphery of the stator base is sequentially provided with a first ring plate, a second ring plate, a supporting ring plate, a fourth ring plate, a fifth ring plate and a plurality of axial rib plates, an inclined conical ring plate is connected between the first ring plate and the supporting ring plate, an end of the second ring plate is connected to the conical ring plate, a sixth ring plate is arranged between the second ring plate and the supporting ring plate, a seventh ring plate, an eighth ring plate and a ninth ring plate are sequentially arranged between the supporting ring plate and the fifth ring plate, and the seventh ring plate is connected to the end of the fourth ring plate, an eleventh ring plate is arranged between the non-driving end air outlet space and the fifth ring plate, one end of the eleventh ring plate is connected to the fifth ring plate, and the other end is connected to the non-driving end air outlet space.

[0014] The radial dimensions of the air inlet cavity and the air outlet cavity are not less than 100 mm.

[0015] The axial lengths of the air inlet cavity and the air outlet cavity are set to be more than 1500 mm.

[0016] The number of the first ventilation holes is consistent with that of the third ventilation holes or the fourth ventilation holes.

[0017] The third ventilation hole and the fourth ventilation hole are located at the same position on the circumference.

[0018] The first ventilation duct, the second ventilation duct and the third ventilation duct are combined to form an air inlet.

[0019] The air inlets and the air outlet ducts are evenly distributed along the circumference.

[0020] The number of the air inlet and outlet ducts is 6-8.

[0021] The eleventh ring plate is fixedly connected with a sealing mounting ring plate.

[0022] The inner end surface and the outer end surface of the sealing installation ring plate are both processed with annular grooves.

[0023] The lower end of the supporting ring plate is fixedly connected with a central flange.

[0024] The beneficial effects of the present invention are as follows: 1. Compared with the prior art, the present invention can greatly reduce the difference in air volume of the stator core ventilation duct, so that each core segment and the stator coil at each core segment can be adequately and evenly cooled by air, thereby improving the cooling effect.

[0025] 2. A cooling air path of the present invention cools the stator straight section diameter close to the non-driving end, the non-driving end of the stator coil and the copper ring. The air path stroke is relatively short, which can fully ensure the cooling of the non-driving end of the stator coil and the copper ring, thereby improving the cooling efficiency.

[0026] 3. Another cooling air path of the present invention is close to the straight section diameter of the stator at the driving end. The cooling air path of the stator coil driving end is simple and is less affected by the heat dissipated by the stator core. It can fully ensure the cooling of the stator driving end and improve the cooling efficiency.

[0027] 4. The radial dimensions of the air inlet and outlet cavities of the third cooling air path in the middle of the stator of the present invention are large, which can reduce wind resistance, and the air inlet and outlet cavities are arranged evenly at circumferential intervals, which ensures the heat dissipation area while increasing the air volume, effectively improving the cooling effect, and significantly reducing the temperature difference of the stator.

[0028] 5. The air inlet duct and the air outlet duct of the present invention are evenly distributed along the circumference, with a number of 6-8, which is conducive to more uniform flow of cooling air on the circumference, and is conducive to reducing the circumferential wind temperature difference and ensuring the ventilation and cooling effect.

[0029] 6. Three air ducts with different directions improve the cooling effect, reduce the stator temperature difference, and improve the cooling air utilization efficiency, thereby adapting to the unfavorable conditions of lower air density in high altitude areas.

[0030] Cooling air diagram Figure 1 It is a longitudinal section view of the stator frame of the present invention; Figure 2 For the present invention Figure 1 AA cross-section of stator frame; Figure 3 For the present invention Figure 1 Cross-section of stator frame BB; Figure 4 For the present invention Figure 1 Cross-section of stator frame CC; Figure 5 For the present invention Figure 1 Stator frame DD cross-section; Figure 6 It is a schematic diagram of the stator frame of the present invention; Figure 7 It is a schematic cross-sectional view of the stator frame of the present invention.

[0031] The markings in the figure are: 1. center flange, 2. first ventilation duct, 3. second ventilation duct, 4. third ventilation duct, 5. eleventh ring plate, 6. sealing mounting ring plate, 7. air outlet duct, 8. ninth ring plate, 9. first ring plate, 10. supporting ring plate, 11. fifth ring plate, 12. rib plate, 13. second ring plate, 14. sixth ring plate, 15. fourth ring plate, 16. seventh ring plate, 17. conical ring plate, 18. eighth ring plate, 19. twelfth ring plate, 20. thirteenth ring plate, 21. tenth ring plate, 22. ninth ventilation hole, 23. second ventilation Hole, 24. First pressure equalizing chamber, 25. Second pressure equalizing chamber, 26. Third pressure equalizing chamber, 27. Air inlet chamber, 28. First air outlet chamber, 29. First space, 30. Second space, 31. Third space, 32. Drive end air outlet space, 33. Non-drive end air outlet space, 34. Third ventilation hole, 35. Fourth ventilation hole, 36. First ventilation hole, 37. Eighth ventilation hole, 38. Tenth ventilation hole, 39. Eleventh ventilation hole, 40. Fifth space, 41. Twelfth ventilation hole, 42. Second air outlet chamber, 43. First cavity, 44. Second cavity. DETAILED DESCRIPTION

[0032] Example 1 This embodiment further illustrates the structure and principle of the present invention in conjunction with the accompanying drawings: A stator frame for high-altitude long-core permanent magnet wind turbine stator partition cooling, comprising a first space 29, a second space 30, a third space 31, a non-driving end air outlet space 33, a fifth space 40, a driving end air outlet space 32, a first pressure equalizing chamber 24, a second pressure equalizing chamber 25, a third pressure equalizing chamber 26, an air inlet chamber 27, a first air outlet chamber 28 and a second air outlet chamber 42 in the stator frame; a first ventilation duct 2, a second ventilation duct 3 and a third ventilation duct 4 for allowing cooling air to enter the frame and an air outlet duct 7 for discharging cooling air; First partition cooling path: the first ventilation duct 2 is connected to the first pressure equalizing chamber 24, the first pressure equalizing chamber 24 is connected to the non-driving end air outlet space 33, and the non-driving end air outlet space 33 is connected to the fifth space 40; Second partition cooling path: the second ventilation duct 3 is connected to the third pressure equalizing chamber 26, the third pressure equalizing chamber 26 is connected to the drive end air outlet space 32, the drive end air outlet space 32 is connected to the third space 31, and the third space 31 is connected to the fifth space 40; The third partition cooling path: the third ventilation duct 4 is connected to the second pressure equalizing chamber 25, the second pressure equalizing chamber 25 is connected to the air inlet chamber 27, the air inlet chamber 27 is connected to the first air outlet chamber 28 and the second air outlet chamber 42; the first air outlet chamber 28 is connected to the first space 29), the first space 29 is connected to the second space 30, the second space 30 is connected to the fifth space 40; the second air outlet chamber 42 is connected to the second space 30, the second space 30 is connected to the fifth space 40; The fifth space 40 is connected to the air outlet duct 7 .

[0033] The first space 29 is surrounded by the support ring plate 10, the sixth ring plate 14 and the conical ring plate 17, the second space 30 is surrounded by the support ring plate 10, the fifth ring plate 11, the seventh ring plate 16 and the eighth ring plate 18, the third space 31 is surrounded by the support ring plate 10, the fifth ring plate 11, the eighth ring plate 18 and the ninth ring plate 8, the fifth space 40 is surrounded by the eleventh ring plate 5, the fifth ring plate 11, the twelfth ring plate 19 and the thirteenth ring plate 20, the support ring plate 10 located in the first space 29 and the second space 30 is provided with a circumferentially distributed first ventilation hole 36 connecting the first space 29 and the second space 30, the eighth ventilation hole 37 provided on the support ring plate 10 connects the drive end air outlet space 32 and the third space 31, and the tenth ventilation hole 37 is provided on the fifth ring plate 11 8 connects the second space 30 and the fifth space 40, the fifth ring plate 11 is provided with an eleventh ventilation hole 39 connecting the third space 31 and the fifth space 40, the twelfth ventilation hole 41 on the eleventh ring plate 5 connects the non-drive end air outlet space 33 and the fifth space 40, the second ventilation holes 23 are arranged at intervals on the support ring plate 10 to connect the first cavity 43 and the second cavity 44, the ninth ventilation holes 22 are evenly arranged on the circumference of the fourth ring plate 15 to connect the second cavity 44 and the second equalizing pressure cavity 25, the sixth ring plate 14 and the seventh ring plate 16 are respectively provided with third ventilation holes 34 and fourth ventilation holes 35 at intervals along the circumference, and are only distributed at the circumferential position corresponding to the air outlet cavity, so that the first air outlet cavity 28 is connected with the first space 29, and the second air outlet cavity 42 is connected with the second space 30.

[0034] The air inlet cavity 27 is divided into a first cavity 43 and a second cavity 44. The first cavity 43 is surrounded by a second ring plate 13, a support ring plate 10, a sixth ring plate 14 and a plurality of rib plates 12 on the circumference to form the periphery of the stator base; the second cavity 44 is surrounded by a support ring plate 10, a seventh ring plate 16, a fourth ring plate 15 and a plurality of rib plates 12, and the same number of the rib plates 12 are evenly distributed on the circumference as the first cavity. The positions of the first cavity 43 and the second cavity 44 on the circumference correspond to each other, and are separated from each other by the support ring plate 10; the air outlet cavity is divided into a first air outlet cavity 28 and a second air outlet cavity 42 by the support ring plate 10, and the air inlet cavity 27 is evenly spaced from the air outlet cavity on the circumference.

[0035] The first pressure equalizing chamber 24 is surrounded by the fifth ring plate 11, the fourth ring plate 15 and the tenth ring plate 21, the second pressure equalizing chamber 25 is surrounded by the fifth ring plate 11, the fourth ring plate 15, the seventh ring plate 16 and the tenth ring plate 21, and the third pressure equalizing chamber 26 is surrounded by the first ring plate 9, the second ring plate 13 and the conical ring plate 17; the first pressure equalizing chamber 24 and the second pressure equalizing chamber 25 are arranged between the fourth ring plate 15 and the fifth ring plate 11.

[0036] The first ventilation duct 2 passes through the support ring plate 10 to open a fifth ventilation hole on the circumference to connect to the first pressure equalizing chamber 24; the third ventilation duct 4 passes through the support ring plate 10 to open a sixth ventilation hole on the circumference to connect to the second pressure equalizing chamber 25; the second ventilation duct 3 passes through the seventh ventilation hole evenly opened on the second ring plate 13, the support ring plate 10 and the fourth ring plate 15 to connect to the third pressure equalizing chamber 26.

[0037] The outer periphery of the stator base is sequentially provided with a first ring plate 9, a second ring plate 13, a support ring plate 10, a fourth ring plate 15, a fifth ring plate 11 and a plurality of axial rib plates 12; an inclined conical ring plate 17 is connected between the first ring plate 9 and the support ring plate 10; the end of the second ring plate 13 is connected to the conical ring plate 17; a sixth ring plate 14 is arranged between the second ring plate 13 and the support ring plate 10; a seventh ring plate 16, an eighth ring plate 18 and a ninth ring plate 8 are sequentially arranged between the support ring plate 10 and the fifth ring plate 11, and the seventh ring plate 16 is connected to the end of the fourth ring plate 15; an eleventh ring plate 5 is arranged between the non-driving end air outlet space 33 and the fifth ring plate 11; one end of the eleventh ring plate 5 is connected to the fifth ring plate 11, and the other end is connected to the non-driving end air outlet space 33.

[0038] The radial dimensions of the air inlet cavity and the air outlet cavity are not less than 100 mm.

[0039] The axial lengths of the air inlet cavity and the air outlet cavity are set to be more than 1500 mm.

[0040] The number of the first ventilation holes 36 is consistent with that of the third ventilation holes 34 or the fourth ventilation holes 35 .

[0041] The third ventilation hole 34 and the fourth ventilation hole 35 are located at the same position on the circumference.

[0042] The first ventilation duct 2, the second ventilation duct 3 and the third ventilation duct 4 are combined to form an air inlet.

[0043] The air inlet and the air outlet duct 7 are evenly distributed along the circumference.

[0044] The number of the air inlet and the air outlet ducts 7 is 6-8.

[0045] The eleventh ring plate 5 is fixedly connected to a sealing mounting ring plate 6 .

[0046] The inner end surface and the outer end surface of the sealing mounting ring plate 6 are both processed with annular grooves.

[0047] The lower end of the support ring plate 10 is fixedly connected with a central flange 1 .

[0048] like Figure 1-7As shown, after the cooling air enters the first equalizing pressure chamber 24 composed of the fifth ring plate 11, the fourth ring plate 15 and the tenth ring plate 21 from the first ventilation duct 2, it disperses in the circumferential direction, passes through the iron core radial ventilation channels distributed on the circumference to the air gap and enters the non-driving end air outlet space, and then flows from the twelfth ventilation hole 41 on the eleventh ring plate 5 to the fifth space 40 composed of the eleventh ring plate 5, the fifth ring plate 11, the twelfth ring plate 19 and the thirteenth ring plate 20.

[0049] After the cooling air enters the third equalizing pressure chamber 26 composed of the first ring plate 9, the second ring plate 13 and the conical ring plate 17 from the second ventilation, it disperses in the circumferential direction, passes through the radial ventilation ducts of the iron core distributed on the circumference to the air gap, enters the drive end air outlet space 33, passes through the eighth ventilation holes 37 evenly distributed on the support ring plate 10, enters the third space 31 composed of the ninth ring plate 8, the support ring plate 10, the fifth ring plate 11 and the eighth ring plate 8, and then passes through the eleventh ventilation holes 39 evenly distributed on the fifth ring plate 11 and flows to the fifth space 40.

[0050] After the cooling air enters the second pressure equalizing chamber 25 composed of the fifth ring plate 11, the fourth ring plate 15, the seventh ring plate 16 and the tenth ring plate 21 from the third ventilation duct 3, it is dispersed in the circumferential direction, and enters the air inlet chamber 27 which is not less than 100 mm and more than 1500 mm long through the ninth ventilation holes 22 evenly distributed on the fourth ring plate 15 and the second ventilation holes 23 on the support ring plate 10, and then passes through the iron core radial ventilation ducts distributed on the circumference of the air inlet chamber 27 to the air gap, and then enters from the air gap through the iron core radial ventilation duct to the air inlet chamber 27 which is not less than 100 mm and more than 1500 mm long. The air outlet cavity 28 passes through the radial ventilation duct of the iron core distributed on the circumference corresponding to the air outlet cavity 28, passes through the third ventilation hole 34 on the sixth ring plate 14 and the ventilation hole 35 on the seventh ring plate 16 to the first space 29 composed of the support ring plate 10, the sixth ring plate 14 and the conical ring plate 17 and the second space 30 composed of the support ring plate 10, the fifth ring plate 11, the seventh ring plate 16 and the eighth ring plate 8. The cooling air in the first space 29 enters the second space 30 through the first ventilation hole 36 on the support ring plate 10, and finally enters the fifth space 40 through the tenth ventilation hole 38 on the fifth ring plate 11.

[0051] The three winds are gathered into the fifth space 40 and discharged through the air outlet duct 7 .

[0052] Example 2 The first ventilation duct 2, the second ventilation duct 3 and the third ventilation duct are combined to form a set of air inlet ducts. The air inlet ducts and the air outlet ducts 7 are evenly distributed along the circumference, with a number of 6-8. A blower is installed at the air inlet duct, which is conducive to a more uniform flow of cooling air on the circumference, thereby ensuring the ventilation and cooling effect, reducing the circumferential wind temperature difference, and ensuring the ventilation and cooling effect.

[0053] The radial dimensions of the air inlet chamber 27, the first air outlet chamber 28, and the second air outlet chamber 42 are not less than 100 mm. On the one hand, the radial dimensions of the air inlet chamber 27, the first air outlet chamber 28, and the second air outlet chamber 42 are large, which can reduce wind resistance and ensure that there is sufficient cooling air in the air inlet chamber 27 to cool the stator core. After the cooling air exchanges heat with the stator core, it can ensure that the hot air flows smoothly out of the first air outlet chamber 28 and the second air outlet chamber 42. On the other hand, the radial dimensions of the air inlet chamber 27 are large, the wind resistance is reduced, and the cooling air entering is sufficient. The cooling air flows from the corresponding air inlet chamber to the radial ventilation duct and the air gap, and then flows to the corresponding air outlet chamber through the radial ventilation duct, so that the contact area between the cooling air and the stator core in the middle part of the stator is large enough, and when in contact, the cooling air is close to the stator core. The time interval is long, the heat exchange time is long, the heat exchange efficiency is high, and the axial temperature difference cooling effect is significant; thirdly, when the cooling air flows from one end of the air inlet cavity 27 to the other end of the air inlet cavity, it will be affected by the heat dissipated by the stator core and the stator coil, which will cause the temperature of the cooling air to partially increase. However, since the cooling air entering the air inlet cavity 27 is sufficient, the difference in air volume in the radial ventilation duct is reduced, so that the contact time between the cooling air and the stator core is long, the heat exchange time is long, and the heat exchange effect is high, so that each section of the stator core and the stator coil at each section of the stator core can obtain more sufficient cooling air, thereby improving the cooling effect and achieving significant cooling effect.

[0054] The radial dimension of the first pressure equalizing chamber 24 is not less than 150 mm; the radial dimension of the second pressure equalizing chamber 25 is not less than 100 mm, and the radial dimension of the third pressure equalizing chamber 26 is not less than 200 mm.

[0055] The number of the fourth ventilation holes 35 is the same as that of the second ventilation holes 23 or the third ventilation holes 34 , and the positions of the fourth ventilation holes 35 on the circumference are the same as those of the second ventilation holes 23 and the third ventilation holes 34 .

Claims

1. A stator frame with zoned cooling for a high-altitude long-core permanent magnet wind turbine stator, characterized in that: The stator frame comprises a first space (29), a second space (30), a third space (31), a non-driving end air outlet space (33), a fifth space (40), a driving end air outlet space (32), a first pressure equalizing chamber (24), a second pressure equalizing chamber (25), a third pressure equalizing chamber (26), an air inlet chamber (27), a first air outlet chamber (28), and a second air outlet chamber (42); a first ventilation duct (2), a second ventilation duct (3), and a third ventilation duct (4) for allowing cooling air to enter the frame, and an air outlet duct (7) for discharging the cooling air; First partitioned cooling path: the first ventilation duct (2) is connected to the first pressure equalizing chamber (24), the first pressure equalizing chamber (24) is connected to the non-driving end air outlet space (33), and the non-driving end air outlet space (33) is connected to the fifth space (40); Second partition cooling path: the second ventilation duct (3) is connected to the third pressure equalizing chamber (26), the third pressure equalizing chamber (26) is connected to the drive end air outlet space (32), the drive end air outlet space (32) is connected to the third space (31), and the third space (31) is connected to the fifth space (40); Third partitioned cooling path: the third ventilation duct (4) is connected to the second pressure equalizing chamber (25), the second pressure equalizing chamber (25) is connected to the air inlet chamber (27), the air inlet chamber (27) is connected to the first air outlet chamber (28) and the second air outlet chamber (42); the first air outlet chamber (28) is connected to the first space (29), the first space (29) is connected to the second space (30), the second space (30) is connected to the fifth space (40); the second air outlet chamber (42) is connected to the second space (30), the second space (30) is connected to the fifth space (40); The fifth space (40) is connected to the air outlet duct (7).

2. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The first space (29) is surrounded by a support ring plate (10), a sixth ring plate (14) and a conical ring plate (17); the second space (30) is surrounded by a support ring plate (10), a fifth ring plate (11), a seventh ring plate (16) and an eighth ring plate (18); the third space (31) is surrounded by a support ring plate (10), a fifth ring plate (11), an eighth ring plate (18) and a ninth ring plate (8); the fifth space (40) is surrounded by an eleventh ring plate (5), a fifth ring plate (11), a twelfth ring plate (19) and a thirteenth ring plate (20); the support ring plate (10) located in the first space (29) and the second space (30) is provided with circumferentially distributed first ventilation holes (36) for connecting the first space (29) and the second space (30); the eighth ventilation holes (37) provided on the support ring plate (10) are connected to the drive end air outlet space (32) and the third space (31); the fifth ring plate (11) is provided with a tenth ventilation hole (37) for connecting the drive end air outlet space (32) and the third space (31); The air hole (38) is connected to the second space (30) and the fifth space (40); the eleventh ventilation hole (39) is arranged on the fifth ring plate (11) to connect the third space (31) and the fifth space (40); the twelfth ventilation hole (41) on the eleventh ring plate (5) is connected to the non-drive end air outlet space (33) and the fifth space (40); the second ventilation holes (23) are arranged at intervals on the support ring plate (10) to connect the first cavity (43) and the second cavity (44); the ninth ventilation holes (22) are evenly arranged on the circumference of the fourth ring plate (15) to connect the second cavity (44) and the second pressure equalizing cavity (25); the third ventilation holes (34) and the fourth ventilation holes (35) are arranged at intervals along the circumference on the sixth ring plate (14) and the seventh ring plate (16), respectively, and are distributed only at the circumferential positions corresponding to the air outlet cavities, so that the first air outlet cavity (28) is connected to the first space (29), and the second air outlet cavity (42) is connected to the second space (30).

3. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The air inlet cavity (27) is divided into a first cavity (43) and a second cavity (44); the first cavity (43) is formed by a second ring plate (13), a support ring plate (10), a sixth ring plate (14) and a plurality of rib plates (12) on the circumference to form the outer periphery of the stator base; the second cavity (44) is formed by a support ring plate (10), a seventh ring plate (16), a fourth ring plate (15) and a plurality of rib plates (12), the number of which is the same as that of the first cavity and is evenly distributed on the circumference; the first cavity (43) and the second cavity (44) are located at corresponding positions on the circumference and are separated from each other by the support ring plate (10); the air outlet cavity is divided into a first air outlet cavity (28) and a second air outlet cavity (42) by the support ring plate (10); the air inlet cavity (27) and the air outlet cavity are evenly spaced on the circumference.

4. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The first pressure equalizing chamber (24) is surrounded by the fifth ring plate (11), the fourth ring plate (15) and the tenth ring plate (21); the second pressure equalizing chamber (25) is surrounded by the fifth ring plate (11), the fourth ring plate (15), the seventh ring plate (16) and the tenth ring plate (21); and the third pressure equalizing chamber (26) is surrounded by the first ring plate (9), the second ring plate (13) and the conical ring plate (17); the first pressure equalizing chamber (24) and the second pressure equalizing chamber (25) are arranged between the fourth ring plate (15) and the fifth ring plate (11).

5. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The first ventilation duct (2) passes through the support ring plate (10) to open a fifth ventilation hole on the circumference to connect to the first pressure equalizing chamber (24); the third ventilation duct (4) passes through the support ring plate (10) to open a sixth ventilation hole on the circumference to connect to the second pressure equalizing chamber (25); the second ventilation duct (3) passes through a seventh ventilation hole evenly opened on the second ring plate (13), the support ring plate (10) and the fourth ring plate (15) to connect to the third pressure equalizing chamber (26).

6. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The outer periphery of the stator base is provided with a first ring plate (9), a second ring plate (13), a support ring plate (10), a fourth ring plate (15), a fifth ring plate (11) and a plurality of axial rib plates (12) in sequence; an inclined conical ring plate (17) is connected between the first ring plate (9) and the support ring plate (10); the end of the second ring plate (13) is connected to the conical ring plate (17); a sixth ring plate (14) is provided between the second ring plate (13) and the support ring plate (10); a seventh ring plate (16), an eighth ring plate (18) and a ninth ring plate (8) are provided in sequence between the support ring plate (10) and the fifth ring plate (11); the seventh ring plate (16) is connected to the end of the fourth ring plate (15); an eleventh ring plate (5) is provided between the non-driving end air outlet space (33) and the fifth ring plate (11); one end of the eleventh ring plate (5) is connected to the fifth ring plate (11), and the other end is connected to the non-driving end air outlet space (33).

7. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 3, characterized in that: The radial dimensions of the air inlet cavity and the air outlet cavity are not less than 100 mm.

8. The stator frame of a high altitude long core permanent magnet wind turbine stator with zoned cooling according to claim 3 or 7, characterized in that: The axial lengths of the air inlet cavity and the air outlet cavity are set to be more than 1500 mm.

9. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 6, characterized in that: The number of the first ventilation holes (36) is consistent with the number of the third ventilation holes (34) or the fourth ventilation holes (35).

10. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 6, characterized in that: The third ventilation hole (34) and the fourth ventilation hole (35) are located at the same position on the circumference.

11. The stator frame of a high altitude long core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The first ventilation duct (2), the second ventilation duct (3) and the third ventilation duct (4) are combined to form an air inlet.

12. The stator frame of a high altitude long core permanent magnet wind turbine stator with zoned cooling according to claims 1 and 11, characterized in that: The air inlet and the air outlet duct (7) are evenly distributed along the circumference.

13. The stator frame of a high altitude long core permanent magnet wind turbine stator with zoned cooling according to claim 12, characterized in that: The number of the air inlet and air outlet ducts (7) is 6-8.

14. The stator frame of a high altitude long core permanent magnet wind turbine stator with zoned cooling according to claim 6, characterized in that: The eleventh ring plate (5) is fixedly connected to a sealing mounting ring plate (6).

15. The stator frame of a high altitude long iron core permanent magnet wind turbine stator with zoned cooling according to claim 14, characterized in that: The inner end surface and the outer end surface of the sealing mounting ring plate (6) are both machined with annular grooves.

16. The stator frame of a high-altitude long-core permanent magnet wind turbine stator with zoned cooling according to claim 1, characterized in that: The lower end of the supporting ring plate (10) is fixedly connected to a central flange (1).

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