A method for improving the temperature rise uniformity of the windward and leeward surfaces of a pole coil

Abstract

The present invention discloses a method for improving the temperature rise uniformity of the windward and leeward surfaces of a pole coil, belonging to the technical field of cooling of pumped-storage power generation motors. The method comprises the following steps: S1. Fix the inter-pole partition plate on the yoke, and form an outer ventilation duct of the pole coil between two adjacent pole coils; S2. Provide an inter-pole side middle air duct, an inter-pole radial air duct and an inter-pole lateral air duct on the inter-pole partition plate; S3. The ventilation holes, the radial air holes and the radial-to-circumferential air holes form an internal radial air duct of the pole coil; S4. Provide a first gap between the pole coil and the pole core, and provide a second gap between the iron support plate and the pole core; S5. The cooling air is divided into three cooling air paths by the inter-pole partition plate to cool the pole coil. In the present invention, the distribution of the cooling air volume at each part of the pole coil is more flexible and effective, the degree of refinement of the air volume distribution is adjustable, and the temperature rise uniformity of the windward and leeward surfaces of the pole coil can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of cooling high-speed, large-capacity hydroelectric generators and pumped-storage power generation motors, and in particular to a method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil. Background Art

[0002] When the rotors of hydro-turbine generators and pumped-storage power generation motors rotate in a certain direction, the windward side of the outer side of the pole coil is cooled better than the leeward side of the pole. The temperature rise of the leeward side is often higher than that of the windward side, resulting in a large temperature difference on both sides of the pole coil. This is an inevitable problem of temperature rise uniformity caused by the inherent structure of the rotor, which can easily lead to the problem of uncoordinated thermal deformation of the pole coil. This problem is more prominent for high-speed, large-capacity generators and pumped-storage power generation motors in hydropower projects.

[0003] At present, internal air ducts are usually set in the pole coils to enhance the cooling effect of the pole coils. However, the difference in cooling conditions on the windward and leeward sides of the pole coils is not considered, and no targeted method is proposed for the uniformity of temperature rise on the windward and leeward sides of the pole coils.

[0004] A Chinese patent document with publication number CN103715803A and publication date April 9, 2014 discloses a method for internal cooling and external cooling of rotor poles. The cooling gas flows into the channel between the two pole coils through the ventilation partitioning device on the air inlet end of the two pole coils to form an external cooling ventilation path, and cools the outside of the pole coil. At the same time, the cooling gas flows into the interior of the pole coil through the gap between the pole core and the pole coil to form an internal cooling ventilation path, and cools the inside of the pole coil. Then, it flows from the inside of the pole coil to the channel between the two pole coils. The ventilation partitioning device separates the external cooling ventilation path and the internal cooling ventilation path flowing into the channel from each other.

[0005] The patent document discloses a method for cooling the rotor magnetic poles by internal cooling and external cooling. The magnetic pole coils are cooled internally and externally at the same time, and the ventilation paths of internal cooling and external cooling in the channel between the two magnetic pole coils are separated, so that the internal cooling and external cooling ventilation paths do not interfere with each other, and the cooling gas of the internal ventilation can flow smoothly into the channel between the two magnetic pole coils, thereby improving the cooling effect of the entire rotor magnetic pole. However, the distribution of cooling air volume in various parts of the magnetic pole coil is not easy to adjust, and the temperature rise uniformity of the windward and leeward sides of the magnetic pole coil cannot be improved. Summary of the invention

[0006] In order to overcome the defects of the above-mentioned prior art, the present invention provides a method for improving the uniformity of temperature rise on the windward and leeward surfaces of a magnetic pole coil. The distribution of cooling air volume at various parts of the magnetic pole coil of the present invention is more flexible and effective, and the degree of refinement of air volume distribution is adjustable, which can improve the uniformity of temperature rise on the windward and leeward surfaces of the magnetic pole coil.

[0007] The present invention is realized through the following technical solutions:

[0008] A method for improving the temperature rise uniformity of the windward and leeward surfaces of a pole coil, comprising the following steps:

[0009] S1. Install an inter-pole partition plate between two adjacent pole coils and fix the inter-pole partition plate on the yoke, forming an outer ventilation duct for the pole coil between the two adjacent pole coils;

[0010] S2. Provide an intermediate lateral air duct, an intermediate radial air duct, and an intermediate side air duct on the inter-pole partition plate;

[0011] S3. Arrange a plurality of radially penetrating ventilation holes along the axial direction of the pole coil, provide radial air holes on the insulating support plate, and provide circumferential ventilation grooves and radial-to-circumferential air holes on the iron support plate. The ventilation holes, radial air holes, and radial-to-circumferential air holes form an internal radial air duct for the pole coil, and the internal radial air duct for the pole coil is distributed on the leeward and windward surfaces of the pole coil;

[0012] S4. Provide a first gap between the pole coil and the pole core, and provide a second gap between the iron support plate and the pole core. The first gap and the second gap communicate to form an inner radial air duct for the pole coil;

[0013] S5. Cool the pole coil with cooling air divided into three cooling air paths by the inter-pole partition plate.

[0014] In the above S3, the cross-sectional shape of the ventilation hole is rectangular, trapezoidal, circular, or rounded rectangular.

[0015] In the above S3, the cross-sectional shape of the radial air hole is circular or rounded rectangular.

[0016] In the above S3, the cross-sectional shape of the radial-to-circumferential air hole is circular or rounded rectangular.

[0017] In the above S3, both the circumferential ventilation groove and the radial-to-circumferential air hole are multiple, and the circumferential ventilation groove and the radial-to-circumferential air hole are arranged at intervals on the iron support plate.

[0018] In the above S4, the first gap refers to the gap formed between the inner side surface of the pole coil and the pole core, and the second gap refers to the gap formed between the circumferential ventilation groove on the iron support plate and the pole core.

[0019] In the above S5, the three cooling air paths refer to the inner side surface cooling air path of the pole coil, the internal cooling air path of the pole coil, and the outer side surface cooling air path of the pole coil.

[0020] The inner side cooling air path of the magnetic pole coil includes an inter-pole lateral air duct and a radial air duct on the inner side of the magnetic pole coil, and the radial air duct on the inner side of the magnetic pole coil is communicated with the inter-pole lateral air duct.

[0021] The internal cooling air path of the magnetic pole coil includes an inter-pole middle air duct and a radial air duct inside the magnetic pole coil, and the radial air duct inside the magnetic pole coil is communicated with the inter-pole middle air duct.

[0022] The outer side cooling air path of the magnetic pole coil includes an inter-pole radial air duct and a ventilation duct on the outer side of the magnetic pole coil, and the ventilation duct on the outer side of the magnetic pole coil is communicated with the inter-pole radial air duct.

[0023] The outer diameter side surface of the inter-pole partition plate is in contact with the inner diameter side surface of the magnetic pole coil.

[0024] In S3, the total cross-sectional area of the radial air ducts inside the magnetic pole coil distributed on the leeward surface of the magnetic pole coil is larger than the total cross-sectional area of the radial air ducts inside the magnetic pole coil distributed on the windward surface of the magnetic pole coil.

[0025] An application for improving the temperature rise of the windward and leeward surfaces of the magnetic pole coil, which is applicable to adjusting the temperature rise uniformity of the windward and leeward surfaces of the magnetic pole coil of a hydro-generator.

[0026] The beneficial effects of the present invention are mainly manifested in the following aspects:

[0027] 1. In the present invention, compared with the prior art, the distribution of the cooling air volume at each part of the magnetic pole coil is more flexible and effective, and the degree of refinement of the air volume distribution is adjustable, which can improve the temperature rise uniformity of the windward and leeward surfaces of the magnetic pole coil.

[0028] 2. The present invention comprehensively considers the cooling requirements of the inner surface, outer surface and inside of the magnetic pole coil, and can improve the temperature rise uniformity of the windward and leeward surfaces of the magnetic pole coil.

[0029] 3. The present invention can effectively improve the cooling effect and structural safety of the rotor of the hydro-generator.

[0030] 4. The present invention can improve the temperature rise uniformity of the windward and leeward surfaces of the magnetic pole coil and has good applicability.

[0031] 5. In the present invention, the total cross-sectional area of the internal radial air ducts of the pole coil distributed on the leeward side of the pole coil is larger than the total cross-sectional area of the internal radial air ducts of the pole coil distributed on the windward side of the pole coil. By setting the number of ventilation holes, radial air holes, and radial-to-circumferential air holes distributed on the leeward side of the pole coil to be more than the number of ventilation holes, radial air holes, and radial-to-circumferential air holes distributed on the windward side of the pole coil, or by setting the sizes of the ventilation holes, radial air holes, and radial-to-circumferential air holes distributed on the leeward side of the pole coil to be larger than the sizes of the ventilation holes, radial air holes, and radial-to-circumferential air holes distributed on the windward side of the pole coil, the internal cooling air volume on the leeward side of the pole coil is made larger than the internal cooling air volume on the windward side of the pole coil, achieving a refined distribution of the cooling air volume, and further being able to effectively improve the temperature rise uniformity of the windward side and the leeward side of the pole coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further specifically described below in conjunction with the drawings in the specification and the specific embodiments:

[0033] Figure 1 is a schematic structural diagram of the present invention;

[0034] Figure 2 is Figure 1 the view from direction B in

[0035] Figure 3 is Figure 1 the view from direction C of the iron support plate in

[0036] Figure 4 is Figure 1 the view from direction C of the insulating support plate in

[0037] Figure 5 is Figure 1 the view from direction D in

[0038] Reference numerals in the drawings: 1, partition plate between poles; 2, pole coil; 3, yoke; 4, ventilation duct outside the pole coil; 5, middle air duct between poles on the side; 6, radial air duct between poles; 7, lateral air duct between poles; 8, ventilation hole; 9, insulating support plate; 10, radial air hole; 11, iron support plate; 12, circumferential ventilation groove; 13, radial-to-circumferential air hole; 14, internal radial air duct of the pole coil; 15, pole core; 16, first gap; 17, second gap; 18, internal radial air duct inside the pole coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Embodiment 1

[0040] Refer to Figures 1-4 , a method for improving the temperature rise uniformity of the windward side and the leeward side of the pole coil, comprising the following steps:

[0041] S1. Install the inter-pole partition baffle 1 between two adjacent pole coils 2, and fix the inter-pole partition baffle 1 on the yoke 3. An outer ventilation duct 4 of the pole coil is formed between the two adjacent pole coils 2;

[0042] S2. Set an inter-pole side middle air duct 5, an inter-pole radial air duct 6 and an inter-pole lateral air duct 7 on the inter-pole partition baffle 1;

[0043] S3. Arrange a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, set radial air holes 10 on the insulating support plate 9, set circumferential ventilation grooves 12 and radial-to-circumferential air holes 13 on the iron support plate 11. The ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form an internal radial air duct 14 of the pole coil. The internal radial air duct 14 of the pole coil is distributed on the leeward side and the windward side of the pole coil 2;

[0044] S4. Set a first gap 16 between the pole coil 2 and the pole core 15, and set a second gap 17 between the iron support plate 11 and the pole core 15. The first gap 16 and the second gap 17 communicate to form an internal radial air duct 18 of the pole coil;

[0045] S5. The cooling air is divided into three cooling air paths by the inter-pole partition baffle 1 to cool the pole coil 2.

[0046] This embodiment is the most basic implementation mode. Compared with the prior art, the distribution of the cooling air volume at each part of the pole coil 2 is more flexible and effective, the refinement degree of the air volume distribution is adjustable, and the temperature rise uniformity of the windward side and the leeward side of the pole coil 2 can be improved.

[0047] Embodiment 2

[0048] See Figures 1-4 , a method for improving the temperature rise uniformity of the windward side and the leeward side of the pole coil, including the following steps:

[0049] S1. Install the inter-pole partition baffle 1 between two adjacent pole coils 2, and fix the inter-pole partition baffle 1 on the yoke 3. An outer ventilation duct 4 of the pole coil is formed between the two adjacent pole coils 2;

[0050] S2. Set an inter-pole side middle air duct 5, an inter-pole radial air duct 6 and an inter-pole lateral air duct 7 on the inter-pole partition baffle 1;

[0051] S3. Arrange a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, set radial air holes 10 on the insulating support plate 9, set circumferential ventilation grooves 12 and radial-to-circumferential air holes 13 on the iron support plate 11. The ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form an internal radial air duct 14 of the pole coil. The internal radial air duct 14 of the pole coil is distributed on the leeward side and the windward side of the pole coil 2;

[0052] S4. A first gap 16 is provided between the pole coil 2 and the pole core 15, and a second gap 17 is provided between the iron carrier plate 11 and the pole core 15. The first gap 16 and the second gap 17 communicate with each other to form a radial air duct 18 inside the pole coil.

[0053] S5. The cooling air passes through the inter-pole partition plate 1 and is divided into three cooling air paths to cool the pole coil 2.

[0054] Preferably, in S3, the cross-sectional shape of the ventilation hole 8 is circular.

[0055] In S3, the cross-sectional shape of the radial air hole 10 is circular.

[0056] In S3, the cross-sectional shape of the radial-to-circumferential air hole 13 is circular.

[0057] In S3, there are a plurality of circumferential ventilation grooves 12 and radial-to-circumferential air holes 13, and the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are arranged at intervals on the iron carrier plate 11.

[0058] This embodiment is a preferred embodiment, which comprehensively considers the cooling requirements of the inner surface, outer surface and interior of the pole coil 2, and can improve the temperature rise uniformity of the windward side and leeward side of the pole coil 2.

[0059] Embodiment 3

[0060] See Figures 1-4 , a method for improving the temperature rise uniformity of the windward side and leeward side of a pole coil, comprising the following steps:

[0061] S1. Install the inter-pole partition plate 1 between two adjacent pole coils 2 and fix the inter-pole partition plate 1 on the yoke 3 to form a ventilation duct 4 outside the pole coil between the two adjacent pole coils 2;

[0062] S2. Provide an inter-pole side middle air duct 5, an inter-pole radial air duct 6 and an inter-pole lateral air duct 7 on the inter-pole partition plate 1;

[0063] S3. Arrange a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, provide radial air holes 10 on the insulating support plate 9, and provide circumferential ventilation grooves 12 and radial-to-circumferential air holes 13 on the iron carrier plate 11. The ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form a radial air duct 14 inside the pole coil, and the radial air duct 14 inside the pole coil is distributed on the windward side and leeward side of the pole coil 2;

[0064] S4. A first gap 16 is provided between the pole coil 2 and the pole core 15, and a second gap 17 is provided between the iron carrier plate 11 and the pole core 15. The first gap 16 and the second gap 17 communicate with each other to form a radial air duct 18 inside the pole coil.

[0065] In S5, the cooling air passes through the inter-pole partition plate 1 and is divided into three cooling air paths to cool the pole coil 2.

[0066] In S3 described above, the cross-sectional shape of the ventilation hole 8 is a rounded rectangle.

[0067] In S3 described above, the cross-sectional shape of the radial air hole 10 is a rounded rectangle.

[0068] In S3 described above, the cross-sectional shape of the radial-to-circumferential air hole 13 is a rounded rectangle.

[0069] In S3 described above, there are multiple circumferential ventilation grooves 12 and radial-to-circumferential air holes 13, and the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are arranged at intervals on the iron carrier plate 11.

[0070] In S4, the first gap 16 refers to the gap formed between the inner side surface of the pole coil 2 and the pole core 15, and the second gap 17 refers to the gap formed between the circumferential ventilation groove 12 on the iron carrier plate 11 and the pole core 15.

[0071] In S5, the three cooling air paths refer to the inner side surface cooling air path of the pole coil, the internal cooling air path of the pole coil, and the outer side surface cooling air path of the pole coil.

[0072] The inner side surface cooling air path of the pole coil includes the inter-pole lateral air duct 7 and the inner side radial air duct 18 of the pole coil, and the inner side radial air duct 18 of the pole coil is communicated with the inter-pole lateral air duct 7.

[0073] The internal cooling air path of the pole coil includes the inter-pole middle air duct 5 and the internal radial air duct 14 of the pole coil, and the internal radial air duct 14 of the pole coil is communicated with the inter-pole middle air duct 5.

[0074] This embodiment is another preferred embodiment, which can effectively improve the cooling effect and structural safety of the water turbine generator rotor.

[0075] Embodiment 4

[0076] See Figures 1-5 , a method for improving the temperature rise uniformity of the windward and leeward surfaces of a pole coil, comprising the following steps:

[0077] In S1, the inter-pole partition plate 1 is installed between two adjacent pole coils 2 and fixed on the yoke 3, and a pole coil outer ventilation duct 4 is formed between the two adjacent pole coils 2;

[0078] In S2, an inter-pole middle air duct 5, an inter-pole radial air duct 6 and an inter-pole lateral air duct 7 are provided on the inter-pole partition plate 1;

[0079] S3. Arrange a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, provide radial air holes 10 on the insulating support plate 9, and provide circumferential ventilation grooves 12 and radial-to-circumferential air holes 13 on the iron support plate 11. The ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form a radial air duct 14 inside the pole coil, and the radial air duct 14 inside the pole coil is distributed on the leeward side and the windward side of the pole coil 2;

[0080] S4. Set a first gap 16 between the pole coil 2 and the pole core 15, and set a second gap 17 between the iron support plate 11 and the pole core 15. The first gap 16 and the second gap 17 communicate to form a radial air duct 18 inside the pole coil;

[0081] S5. The cooling air passes through the inter-pole partition plate 1 and is divided into three cooling air paths to cool the pole coil 2.

[0082] In the above S3, the cross-sectional shape of the ventilation hole 8 is rectangular.

[0083] In the above S3, the cross-sectional shape of the radial air hole 10 is a rectangular with rounded corners.

[0084] In the above S3, the cross-sectional shape of the radial-to-circumferential air hole 13 is a rectangular with rounded corners.

[0085] In the above S3, both the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are multiple, and the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are arranged at intervals on the iron support plate 11.

[0086] In the above S4, the first gap 16 refers to the gap formed between the inner side surface of the pole coil 2 and the pole core 15, and the second gap 17 refers to the gap formed between the circumferential ventilation groove 12 on the iron support plate 11 and the pole core 15.

[0087] Further preferably, in the above S5, the three cooling air paths refer to the cooling air path on the inner side surface of the pole coil, the cooling air path inside the pole coil, and the cooling air path on the outer side surface of the pole coil.

[0088] The cooling air path on the inner side surface of the pole coil includes the inter-pole lateral air duct 7 and the radial air duct 18 inside the pole coil, and the radial air duct 18 inside the pole coil is communicated with the inter-pole lateral air duct 7.

[0089] The cooling air path inside the pole coil includes the inter-pole middle air duct 5 and the radial air duct 14 inside the pole coil, and the radial air duct 14 inside the pole coil is communicated with the inter-pole middle air duct 5.

[0090] The cooling air path on the outer side surface of the pole coil includes the inter-pole radial air duct 6 and the ventilation duct 4 on the outer side of the pole coil, and the ventilation duct 4 on the outer side of the pole coil is communicated with the inter-pole radial air duct 6.

[0091] The outer diameter side surface of the inter-pole partition plate 1 is in contact with the inner diameter side surface of the pole coil 2.

[0092] This embodiment is another preferred embodiment, which can improve the temperature rise uniformity of the windward side and the leeward side of the pole coil 2 and has good applicability.

[0093] Embodiment 5

[0094] See Figures 1-5 , a method for improving the temperature rise uniformity of the windward side and the leeward side of a pole coil, comprising the following steps:

[0095] S1. Install the inter-pole partition plate 1 between two adjacent pole coils 2 and fix the inter-pole partition plate 1 on the yoke 3, so as to form an outer ventilation duct 4 of the pole coil between the two adjacent pole coils 2;

[0096] S2. Provide an inter-pole side middle air duct 5, an inter-pole radial air duct 6 and an inter-pole lateral air duct 7 on the inter-pole partition plate 1;

[0097] S3. Arrange a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, provide radial air holes 10 on the insulating support plate 9, and provide circumferential ventilation grooves 12 and radial-to-circumferential air holes 13 on the iron support plate 11. The ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form an internal radial air duct 14 of the pole coil, and the internal radial air duct 14 of the pole coil is distributed on the leeward side and the windward side of the pole coil 2;

[0098] S4. Provide a first gap 16 between the pole coil 2 and the pole core 15, and provide a second gap 17 between the iron support plate 11 and the pole core 15. The first gap 16 and the second gap 17 communicate to form an inner radial air duct 18 of the pole coil;

[0099] S5. The cooling air is divided into three cooling air paths by the inter-pole partition plate 1 to cool the pole coil 2.

[0100] In S3, the cross-sectional shape of the ventilation hole 8 is rectangular.

[0101] In S3, the cross-sectional shape of the radial air hole 10 is a rounded rectangle.

[0102] In S3, the cross-sectional shape of the radial-to-circumferential air hole 13 is a rounded rectangle.

[0103] In S3, both the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are multiple, and the circumferential ventilation grooves 12 and the radial-to-circumferential air holes 13 are arranged at intervals on the iron support plate 11.

[0104] In S4, the first gap 16 refers to the gap formed between the inner side surface of the pole coil 2 and the pole core 15, and the second gap 17 refers to the gap formed between the circumferential ventilation groove 12 on the iron carrier plate 11 and the pole core 15.

[0105] In S5, the three-way cooling air path refers to the inner side surface cooling air path of the pole coil, the internal cooling air path of the pole coil, and the outer side surface cooling air path of the pole coil.

[0106] The inner side surface cooling air path of the pole coil includes the inter-pole lateral air duct 7 and the inner side radial air duct 18 of the pole coil, and the inner side radial air duct 18 of the pole coil is communicated with the inter-pole lateral air duct 7.

[0107] The internal cooling air path of the pole coil includes the inter-pole middle air duct 5 and the internal radial air duct 14 of the pole coil, and the internal radial air duct 14 of the pole coil is communicated with the inter-pole middle air duct 5.

[0108] The outer side surface cooling air path of the pole coil includes the inter-pole radial air duct 6 and the outer side ventilation duct 4 of the pole coil, and the outer side ventilation duct 4 of the pole coil is communicated with the inter-pole radial air duct 6.

[0109] The outer diameter side surface of the inter-pole partition plate 1 is in contact with the inner diameter side surface of the pole coil 2.

[0110] More preferably, in S3, the total cross-sectional area of the internal radial air ducts 14 of the pole coil 2 distributed on the leeward side of the pole coil 2 is larger than the total cross-sectional area of the internal radial air ducts 14 of the pole coil 2 distributed on the windward side of the pole coil 2.

[0111] This embodiment is the best implementation mode. The total cross-sectional area of the internal radial air ducts 14 of the pole coil 2 distributed on the leeward side of the pole coil 2 is larger than the total cross-sectional area of the internal radial air ducts 14 of the pole coil 2 distributed on the windward side of the pole coil 2. By setting the number of the ventilation holes 8, the radial air holes 10, and the radial-to-circumferential air holes 13 distributed on the leeward side of the pole coil 2 to be more than the number of the ventilation holes 8, the radial air holes 10, and the radial-to-circumferential air holes 13 distributed on the windward side of the pole coil 2, or setting the sizes of the ventilation holes 8, the radial air holes 10, and the radial-to-circumferential air holes 13 distributed on the leeward side of the pole coil 2 to be larger than the sizes of the ventilation holes 8, the radial air holes 10, and the radial-to-circumferential air holes 13 distributed on the windward side of the pole coil 2, the internal cooling air volume on the leeward side of the pole coil 2 is larger than the internal cooling air volume on the windward side of the pole coil 2, achieving the refined distribution of the cooling air volume, and further being able to achieve the effect of effectively improving the temperature rise uniformity of the windward side and the leeward side of the pole coil.

[0112] The basic principle of the present invention is as follows:

[0113] By forming an air duct 4 outside the pole coil between two adjacent pole coils 2, arranging an intermediate air duct 5, an intermediate radial air duct 6 and an intermediate lateral air duct 7 on the intermediate partition plate 1 between poles, arranging a plurality of radially penetrating ventilation holes 8 along the axial direction of the pole coil 2, arranging radial air holes 10 on the insulating support plate 9, arranging a circumferential ventilation groove 12 and a radial-to-circumferential air hole 13 on the iron support plate 11, the ventilation holes 8, the radial air holes 10 and the radial-to-circumferential air holes 13 form an internal radial air duct 14 of the pole coil. By setting a first gap 16 between the pole coil 2 and the pole core 15 and a second gap 17 between the iron support plate 11 and the pole core 15, the first gap 16 and the second gap 17 communicate to form an inner radial air duct 18 of the pole coil. The cooling air cools the pole coil 2 through three cooling air paths divided by the intermediate partition plate 1 between poles. The distribution of the cooling air volume at each part of the pole coil 2 is more flexible and effective, the degree of refinement of the air volume distribution is adjustable, and the temperature rise uniformity of the windward side and the leeward side of the pole coil 2 can be improved.

Claims

1. A method for improving the uniformity of temperature rise on the windward and leeward surfaces of a magnetic pole coil, characterized in that: The following steps are involved: S1, installing an inter-pole partitioning plate (1) between two adjacent magnetic pole coils (2), and fixing the inter-pole partitioning plate (1) on a magnetic yoke (3), so that a magnetic pole coil outer ventilation duct (4) is formed between the two adjacent magnetic pole coils (2); S2. Arranging an inter-pole side central air duct (5), an inter-pole radial air duct (6) and an inter-pole lateral air duct (7) on the inter-pole partitioning plate (1); S3, a plurality of radially penetrating ventilation holes (8) are arranged along the axial direction of the magnetic pole coil (2), radial air holes (10) are arranged on the insulating support plate (9), and circumferential ventilation grooves (12) and radial-to-circumferential air holes (13) are arranged on the iron support plate (11), the ventilation holes (8), the radial air holes (10) and the radial-to-circumferential air holes (13) form radial air ducts (14) inside the magnetic pole coil, and the radial air ducts (14) inside the magnetic pole coil are distributed on the leeward side and the windward side of the magnetic pole coil (2); S4, a first gap (16) is provided between the magnetic pole coil (2) and the magnetic pole core (15), and a second gap (17) is provided between the iron support plate (11) and the magnetic pole core (15), wherein the first gap (16) and the second gap (17) are connected to form a radial air duct (18) inside the magnetic pole coil; S5, cooling air is divided into three cooling air paths through the inter-pole partition plate (1) to cool the magnetic pole coil (2); In the above S3, the total cross-sectional area of ​​the radial air duct (14) inside the magnetic pole coil distributed on the leeward side of the magnetic pole coil (2) is greater than the total cross-sectional area of ​​the radial air duct (14) inside the magnetic pole coil distributed on the windward side of the magnetic pole coil (2), the number of the ventilation holes (8), radial air holes (10) and radial circumferential air holes (13) distributed on the leeward side of the magnetic pole coil (2) is greater than the number of the ventilation holes (8), radial air holes (10) and radial circumferential air holes (13) distributed on the windward side of the magnetic pole coil (2), or the size of the ventilation holes (8), radial air holes (10) and radial circumferential air holes (13) distributed on the leeward side of the magnetic pole coil (2) is greater than the size of the ventilation holes (8), radial air holes (10) and radial circumferential air holes (13) distributed on the windward side of the magnetic pole coil (2); In S4, the first gap (16) refers to the gap formed between the inner side surface of the pole coil (2) and the pole core (15), and the second gap (17) refers to the gap formed between the circumferential ventilation groove (12) on the iron support plate (11) and the pole core (15).

2. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: In S3, the cross-sectional shape of the ventilation hole (8) is rectangular, trapezoidal, circular or rounded rectangular.

3. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: In S3, the cross-sectional shape of the radial air hole (10) is circular or rounded rectangular.

4. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: In S3, the cross-sectional shape of the radial-to-circumferential air hole (13) is circular or rounded rectangular.

5. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: In the above-mentioned S3, there are a plurality of circumferential ventilation slots (12) and radial-to-circumferential air holes (13), and the circumferential ventilation slots (12) and radial-to-circumferential air holes (13) are arranged at intervals on the iron support plate (11).

6. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: In the above S5, the three cooling air paths refer to the cooling air path on the inner side of the magnetic pole coil, the cooling air path inside the magnetic pole coil and the cooling air path on the outer side of the magnetic pole coil.

7. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 6, characterized in that: The cooling air passage on the inner side of the magnetic pole coil comprises an inter-pole lateral air passage (7) and an inner radial air passage (18) of the magnetic pole coil, and the inner radial air passage (18) of the magnetic pole coil is connected to the inter-pole lateral air passage (7).

8. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 6, characterized in that: The internal cooling air passage of the magnetic pole coil comprises an inter-pole side middle air passage (5) and an internal radial air passage (14) of the magnetic pole coil, and the internal radial air passage (14) of the magnetic pole coil is connected to the inter-pole side middle air passage (5).

9. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 6, characterized in that: The cooling air path on the outer side of the magnetic pole coil comprises an inter-pole radial air duct (6) and a magnetic pole coil outer ventilation duct (4), and the magnetic pole coil outer ventilation duct (4) is connected to the inter-pole radial air duct (6).

10. A method for improving the temperature rise uniformity of the windward and leeward surfaces of a magnetic pole coil according to claim 1, characterized in that: The outer diameter side surface of the inter-pole partitioning partition plate (1) is in contact with the inner diameter side surface of the magnetic pole coil (2).

11. An application for improving the temperature rise of the windward and leeward surfaces of a magnetic pole coil, characterized in that: The method for improving the temperature rise uniformity of the windward and leeward surfaces of the pole coil as claimed in claim 1 is suitable for adjusting the temperature rise uniformity of the windward and leeward surfaces of the pole coil of a hydro-turbine generator.

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