A device and method for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator

Abstract

The invention relates to the technical field of cooling of high-speed, large-capacity hydro-turbine generators and pumped-storage power generation motors, and in particular to a device and method for improving the temperature rise uniformity of a hydro-turbine generator magnetic pole coil; the device comprises a shroud; the bottom edge of the shroud wraps and fixes the inner diameter side shroud insulation; the protruding parts on both sides of the inner diameter side shroud insulation are buckled on both sides of the bottom edge of the shroud; an inner insulating plate is arranged between the inner side surface of the magnetic pole coil and the magnetic pole core, and the inner insulating plate is located on both sides of the circumferential ventilation hole of the magnetic pole coil; the inner insulating plate is provided with notches, and the notches are respectively fixed to the protruding parts of the inner diameter side shroud insulation; the inner insulating plate, the inner diameter side shroud insulation, the magnetic pole coil and the magnetic pole core form an inner ventilation cavity of the magnetic pole; the shroud is provided with side ventilation holes, and the side ventilation holes are connected with the circumferential ventilation holes of the magnetic pole coil; the bottom of the shroud is provided with bottom air guide holes; the invention realizes the cooling of the magnetic pole coil at the shroud, effectively improves the temperature difference of the magnetic pole coil, and improves the temperature rise uniformity of the magnetic pole coil.

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 device and method for improving the temperature rise uniformity of a hydroelectric generator magnetic pole coil. Background Art

[0002] Pumped-storage power generation motors have complex operating conditions, with the characteristics of high speed, bidirectional rotation, and frequent start and stop. The pole coils are subject to large stress and deformation. In order to ensure the safety of the pole coils, fixing components are often set on the sides of the pole coils. Side belt fixing is one of the more common coil fixing methods; the setting of the belt causes the coil to be unable to be cooled locally (at the belt), further causing the problem of uneven temperature rise in the pole coil. This problem is more prominent in high-speed, large-capacity generators in major hydropower projects and large-capacity, high-power density, high-speed multi-belt poles in pumped-storage power generation motors.

[0003] The existing technical solutions include a cooling structure that simply adopts external surface ventilation, a structure that adopts combined cooling of the internal and external surfaces, and a solution that uses internal air ducts in the pole coil to enhance the cooling effect of the pole coil. These solutions often only consider the control of the overall temperature rise level of the pole coil, but do not consider the local cooling problem of the pole coil fixing parts, that is, there is no systematic solution to the problem of temperature rise uniformity of the pole coil.

[0004] For example, a Chinese patent with application number 202220108129.4 and application date January 17, 2022 is entitled "A magnetic pole inter-pole ventilation structure for improving magnetic pole cooling effect". Its technical solution is as follows: it includes an inter-pole wind shield and a pole side wind shield, and the inter-pole wind shield is fixedly installed between two adjacent magnetic poles; the pole side wind shield is fixed to the outside of the pole coil, and a ventilation duct is formed between the pole side wind shield and the outer surface of the pole coil. A number of ventilation holes corresponding to the ventilation duct are axially opened on both sides of the inter-pole wind shield, and the cooling air enters the magnetic ventilation duct from the ventilation holes of the inter-pole wind shield. The amount of air entering the inter-pole space can be adjusted by adjusting the number and size of the ventilation holes of the inter-pole wind shield. At the same time, the ventilation wind speed area can be adjusted by adjusting the axial size of the pole side wind shield.

[0005] Although the above patent achieves surface cooling of the pole coil by opening ventilation holes to allow cold air to enter, the pole coil portion at the belt fixing point of the above patent is not conducive to heat dissipation, which will cause a technical problem of uneven overall temperature rise of the pole coil. Summary of the invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a device and method for improving the temperature rise uniformity of the pole coil of a hydro-turbine generator, which can solve the cooling problem of the fixed position of the pole coil belt and effectively improve the temperature rise uniformity of the pole coil.

[0007] In order to achieve the above technical effects, the technical solution of the present invention is as follows:

[0008] A device for improving the uniformity of temperature rise of a pole coil of a hydro-turbine generator comprises a belt; a plurality of rows of side ventilation holes are evenly arranged on the belt; the side of the belt wraps the side belt insulation of the outer surface of the fixed pole coil in the axial direction; a plurality of ventilation holes are opened on the side belt insulation, and each ventilation hole is connected with the corresponding side ventilation hole and the circumferential ventilation hole of the pole coil; the circumferential ventilation hole of the pole coil is arranged on the pole coil; the bottom edge of the belt wraps the inner diameter side belt insulation of the inner diameter side of the fixed pole coil; the protruding parts on both sides of the inner diameter side belt insulation are buckled on both sides of the bottom edge of the belt; two inner insulation plates are arranged between the inner side surface of the pole coil and the pole core at each belt, the two inner insulation plates are both in contact with the inner side surface of the pole coil and the pole core, and the two inner insulation plates are located on both sides of the plurality of circumferential ventilation holes of the pole coil; the two inner insulation plates are located at one end of the inner diameter side of the pole coil Notches are provided on both sides of the two inner insulating plates, and the notches of the two inner insulating plates are matched and fixed with the protruding parts on both sides of the inner diameter side belt insulation respectively; the two inner insulating plates, the inner diameter side belt insulation, the pole coil, the bottom edge of the belt and the pole core form a pole inner ventilation cavity; the belt is provided with a plurality of side ventilation holes along the axial direction of the pole coil, and each side ventilation hole is connected with the corresponding circumferential ventilation hole of the pole coil; the plurality of side ventilation holes in each row are arranged on the belt at equal intervals; the bottom of the belt is provided with a plurality of bottom air guide holes; the plurality of bottom air guide holes are connected with the radial air duct on the inner side of the pole coil; the pole inner ventilation cavity is located in the radial air duct on the inner side of the pole coil; the radial air duct on the inner side of the pole coil is connected with the circumferential ventilation hole of the pole coil, and the circumferential ventilation hole of the pole coil is arranged inside the pole inner ventilation cavity; the radial air duct on the inner side of the pole coil is the gap formed between the pole coil and the pole core.

[0009] Furthermore, the notch at one end of the inner insulating plate on the inner diameter side of the magnetic pole coil is a groove opened toward the inside of the inner insulating plate, and the two sides of the groove are respectively a long protrusion and a short protrusion.

[0010] Furthermore, the short protrusion is in contact with the shroud, and the protruding portion of the insulation of the inner diameter side shroud is located between the long protrusion and the short protrusion of the same inner insulating plate.

[0011] Furthermore, the two inner insulating plates are fixed to the magnetic pole coil by epoxy glue, and the surfaces of the two inner insulating plates in contact with the magnetic pole core are coated with a slip agent.

[0012] Furthermore, the radial cross-section of the bottom air guide hole is an inverted funnel shape.

[0013] Furthermore, the multiple side ventilation holes are all horizontal side ventilation holes, and the horizontal side ventilation holes are evenly arranged in a direction from the inner diameter to the outer diameter of the magnetic pole coil.

[0014] Furthermore, the plurality of side ventilation holes are all inclined side ventilation holes, and the inclined side ventilation holes are evenly arranged in a direction from the inner diameter to the outer diameter of the magnetic pole coil.

[0015] Furthermore, the angle formed by the extension line of the direction opposite to the direction in which the inclined side ventilation holes are opened on the side of the shroud and the extension line of the direction in which the circumferential ventilation holes of the magnetic pole coil are opened is in the range of 40° to 50°.

[0016] Furthermore, the number of the side ventilation holes arranged in each row in the axial direction of the shroud is 2 to 3.

[0017] Furthermore, the side ventilation holes are in the shape of circular holes, square holes or waist-shaped holes.

[0018] Furthermore, the aperture size of the side ventilation holes along the axial direction of the magnetic pole coil ranges from 10 mm to 30 mm, and the aperture size along the radial direction of the magnetic pole coil ranges from 5 mm to 10 mm.

[0019] Furthermore, the side ventilation holes in each column are arranged at equal intervals on the side of the shroud along the radial direction of the magnetic pole coil, and the distance between the equal intervals is 5 turns of coil to 10 turns of coil.

[0020] Furthermore, the plurality of bottom air guide holes are connected to the ventilation groove at the circumference; the ventilation groove at the circumference is arranged on the yoke, and two side guide ventilation holes are arranged inside the ventilation groove at the circumference for guiding cooling air to enter from the bottom air guide holes.

[0021] Furthermore, the axial dimension range of the inner diameter side of the bottom air guide hole is 10mm~20mm, the circumferential dimension of the inner diameter side is 20mm, the axial dimension range of the outer diameter side is 10mm~20mm, and the circumferential dimension of the outer diameter side is 10mm.

[0022] Furthermore, the axial width of the shroud is 120 mm to 160 mm, and the shroud is L-shaped as a whole.

[0023] A method for improving the temperature rise uniformity of a hydro-generator pole coil comprises the following specific steps:

[0024] Step 1: Start to let in cooling air from the yoke. The cooling air is divided into the first cooling air and the second cooling air;

[0025] Step 2: The first cooling air enters from the radial air duct between the yoke segments, directly reaches the radial air duct between the poles, cools the outer surface of the adjacent pole coils, and finally reaches the outer side of the pole core;

[0026] Step three: The second cooling air enters from the ventilation groove at the belt on the yoke, and is guided to the bottom air guide hole of the belt through the side guide ventilation holes inside the ventilation groove at the belt. After entering from the bottom air guide hole, the second cooling air reaches the pole inner ventilation cavity in the radial air duct on the inner side of the pole coil, enters from the pole coil circumferential ventilation holes in the pole inner ventilation cavity, passes through the ventilation holes on the side belt insulation, and then leaves from the side ventilation holes of the belt, and finally reaches the channel formed between the adjacent pole coils; wherein the pole inner ventilation cavity is surrounded by two inner insulating plates at the belt, the inner diameter side belt insulation, the pole coil, the bottom edge of the belt and the pole core.

[0027] Furthermore, there are multiple circumferential ventilation holes of the pole coil, all of which are arranged on the pole coil; each circumferential ventilation hole of the pole coil is connected with the corresponding side ventilation hole; the circumferential ventilation holes of the pole coil are connected with the radial air duct on the inner side of the pole coil, and the circumferential ventilation holes of the pole coil are arranged inside the ventilation cavity inside the pole.

[0028] Furthermore, the radial air duct on the inner side of the pole coil is a gap formed between the pole coil and the pole core; the radial air duct between the poles is a channel formed by the distance between the outer surfaces of adjacent pole coils.

[0029] Furthermore, the protruding parts on both sides of the inner diameter side belt insulation are buckled on both sides of the bottom edge of the belt; two inner insulating plates are arranged between the inner side surface of the pole coil and the pole core, the two inner insulating plates are both in contact with the inner side surface of the pole coil and the pole core, and the two inner insulating plates are located on both sides of the multiple circumferential ventilation holes of the pole coil; a notch is provided at one end of the two inner insulating plates located on the inner diameter side of the pole coil, and the notches of the two inner insulating plates are respectively matched and fixed with the protruding parts on both sides of the inner diameter side belt insulation.

[0030] Furthermore, there are multiple bottom air guide holes; the multiple bottom air guide holes are all connected to the ventilation groove at the belt, and the multiple bottom air guide holes are all connected to the radial air duct on the inner side of the pole coil; the ventilation groove at the belt is opened on the yoke, and two side guide ventilation holes are opened inside the ventilation groove at the belt near the bottom air guide hole of the belt to guide the cooling air to enter from the bottom air guide hole.

[0031] According to the above technical solution, the present invention has the following beneficial effects:

[0032] 1. The method adopted by the present invention solves the comprehensive problem of mechanical fixation and cooling of the pole coil. While ensuring the reliable fixation of the pole coil, it avoids the cooling dead zone of the pole coil caused by the shroud fixation, and greatly reduces the influence of the shroud fixation on the uniformity of the overall temperature rise of the pole coil.

[0033] 2. The device of the present invention adopts two inner insulating plates, inner diameter side belt insulation, pole coil and pole core to form an inner ventilation cavity of the pole. The cooling air entering from the bottom air guide hole first enters the inner ventilation cavity of the pole in the radial air duct on the inner side of the pole coil, and then enters from the circumferential ventilation hole of the pole coil. The inner ventilation cavity of the pole avoids the loss of cooling air from the radial air duct on the inner side of the pole coil when entering, thereby ensuring the continuous and stable input of cooling air, and achieving the technical effect of stable cooling of the pole coil at the belt and the interior of the pole coil.

[0034] 3. The device adopted by the present invention is provided with a bottom air guide and a side ventilation area on the shroud. When the cooling air enters from the bottom air guide and leaves from the side ventilation area, efficient cooling of the pole coil at the shroud is achieved, thereby effectively improving the overall temperature difference level of the pole coil and enhancing the temperature rise uniformity of the pole coil.

[0035] 4. The method adopted in the present invention divides the cooling air into two parts, thereby achieving complete cooling of the pole coil surface, the inner side of the pole coil and the pole coil at the circumferential belt. Compared with the conventional ventilation cooling method in the prior art, the cooling effect is better and the overall temperature difference of the pole coil is less affected.

[0036] 5. The device adopted by the present invention opens a bottom air guide hole at the bottom of the shroud, so that cooling wind can enter the radial air duct on the inner side of the pole coil to cool the inner side of the pole coil, while also cooling the pole coil at the shroud, thereby improving the temperature rise uniformity of the entire pole coil.

[0037] 6. In the device adopted in the present invention, a ventilation groove is opened on the yoke at the shroud, and side guide ventilation holes are opened inside the ventilation groove at the shroud, so that when the cooling air enters, it enters completely from the bottom air guide holes at the bottom of the shroud, avoiding the cooling air loss caused by the unreasonable setting of the ventilation groove inside the shroud, and realizing the stable cooling of the pole coil at the shroud and the inside of the pole coil.

[0038] 7. In the method adopted by the present invention, the angle formed by the extension line of the opposite direction of the opening direction of the side ventilation holes on the side of the shroud and the extension line of the opening direction of the circumferential ventilation holes of the pole coil is in the range of 40°~50°, thereby avoiding mutual interference of cooling winds coming out of the side ventilation holes of adjacent pole coils, resulting in a decrease in the air outlet rate and affecting the cooling of the pole coils at the side of the shroud.

[0039] 8. In the device adopted by the present invention, two inner insulating plates are fixed on the pole coil by epoxy glue, and the surfaces of the two inner insulating plates in contact with the pole core are coated with slip agent. When the pole coil is deformed by mechanical pressure or heat, since the two inner insulating plates are not fixed to the pole core, the two inner insulating plates will move with the deformation of the pole coil, which effectively avoids the situation that when the inner insulating plates are fixed to the pole coil and the pole core at the same time, the fixing surface of the inner insulating plates will be damaged due to following the deformation of the pole coil when the pole coil is deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a partial axial cross-sectional schematic diagram of the present invention.

[0041] Figure 2 yes Figure 1 Schematic diagram of the AA section.

[0042] Figure 3 yes Figure 2 Schematic diagram of BB cross section.

[0043] Figure 4 yes Figure 2 Schematic diagram of CC cross section.

[0044] Figure 5 It is a schematic diagram of the structure of the inner diameter side insulation.

[0045] Figure 6 This is a top view of the inner diameter side insulation.

[0046] Figure 7 It is a schematic diagram of the structure of the inner insulation board.

[0047] Figure 8 It is a side view schematic diagram of the belt.

[0048] Fig. 9 Schematic diagram of the side ventilation holes of the belt.

[0049] Fig.10 This is a schematic diagram of the bottom air guide holes of the belt.

[0050] Fig.11 It is a schematic diagram of the angles at which the side ventilation holes of the belt are opened.

[0051] Fig.12 It is a schematic diagram of the openings for the side band insulation.

[0052] Fig.13 It is a schematic diagram of the structure of the long protrusions and the short protrusions of the inner insulating plate.

[0053] In the attached drawings: 1-pole core; 2-pole coil; 3-ventilation groove at the belt; 4-belt; 5-inner diameter side belt insulation; 6-side guide ventilation holes; 7-radial air duct on the inner side of the pole coil; 8-circumferential ventilation holes of the pole coil; 9-yoke; 10-side ventilation holes; 11-bottom air guide holes; 12-radial air duct between poles; 13-radial air duct between yoke segments; 14-side belt insulation; 15-inner insulation plate; 16-long protrusion; 17-short protrusion. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0055] Example 1

[0056] like Figure 2 As shown, a device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-turbine generator comprises a shroud 4; a plurality of rows of side ventilation holes 10 are evenly arranged on the shroud 4; a side shroud insulation 14 wrapping the outer surface of the fixed magnetic pole coil 2 along the axial direction of the side of the shroud 4; Fig.12 As shown, a plurality of ventilation holes are provided on the side shroud insulation 14, and each ventilation hole is connected with the corresponding side ventilation hole 10 and the circumferential ventilation hole 8 of the magnetic pole coil; the circumferential ventilation hole 8 of the magnetic pole coil is arranged on the magnetic pole coil 2; the bottom edge of the shroud 4 wraps around the inner diameter side shroud insulation 5 on the inner diameter side of the fixed magnetic pole coil 2; as shown Figure 4 , Figure 5 as well as Figure 6 As shown, the protruding parts on both sides of the inner diameter side insulation 5 are buckled on both sides of the bottom edge of the belt 4, and the belt 4 fixes the inner diameter side insulation; Figure 3 As shown, two inner insulating plates 15 are arranged between the inner side of the pole coil 2 and the pole core 1 at each circumferential band 4, and the two inner insulating plates 15 are both in contact with the inner side of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are located on both sides of the plurality of pole coil circumferential ventilation holes 8; one end of the two inner insulating plates 15 located on the inner diameter side of the pole coil 2 is provided with a notch, as shown in FIG. Figure 7 As shown, Figure 7 The notch in the middle is the notch of the inner insulating plate 15, and the notches of the two inner insulating plates 15 are respectively matched and fixed with the protruding parts on both sides of the inner diameter side band insulation 5; the two inner insulating plates 15, the inner diameter side band insulation 5, the pole coil 2, the bottom edge of the band 4 and the pole core 1 form a ventilation cavity inside the pole, through which the cooling air entering from the bottom air guide hole 11 can be prevented from entering from the radial air duct and not entering the circumferential ventilation hole 8 of the pole coil, but flowing out from other places of the pole, causing the loss of cooling air.

[0057] The pole coil 2 is fixed between the shroud 4 and the pole core 1; the end of the side of the shroud 4 is fixed to the pole shoe groove of the pole core 1, and the end of the bottom of the shroud 4 is fixed to the bottom groove of the pole body of the pole core 1. The fixing method of the shroud 4 and the pole core 1 is the existing technology in this field; Fig. 9 As shown, the shroud 4 is provided with a plurality of side ventilation holes 10 along the axial direction of the magnetic pole coil 2, each side ventilation hole 10 is connected with the corresponding magnetic pole coil circumferential ventilation hole 8, and through the opened side ventilation holes 10, when the cooling air passes through the side ventilation holes 10, the magnetic pole coil 2 at the side of the shroud 4 is cooled; the plurality of side ventilation holes 10 in each row are arranged at equal intervals on the shroud 4; Fig.10 As shown, a plurality of bottom air guide holes 11 are provided at the bottom of the shroud 4. When the cooling air passes through the bottom air guide holes 11, the pole coil 2 at the bottom of the shroud 4 is cooled; the plurality of bottom air guide holes 11 are all connected with the radial air duct 7 on the inner side of the pole coil; the pole inner ventilation cavity is located in the radial air duct 7 on the inner side of the pole coil; the radial air duct 7 on the inner side of the pole coil is connected with the circumferential ventilation holes 8 of the pole coil, and the circumferential ventilation holes 8 of the pole coil are arranged inside the pole inner ventilation cavity; the radial air duct 7 on the inner side of the pole coil is the gap formed between the pole coil 2 and the pole core 1. The notch of the inner insulating plate 15 is a groove opened toward the inside of the inner insulating plate 15, and the two sides of the groove are respectively located at a long protrusion 16 and a short protrusion 17; the long protrusion 16 is longer than the short protrusion 17 along the height direction of the inner insulating plate 15; the short protrusion 17 is in contact with the shroud 4, and the protruding part of the inner diameter side shroud insulation 5 is located between the long protrusion 16 and the short protrusion 17 of the same inner insulating plate 15; the two inner insulating plates 15 are fixed to the pole coil 2 by epoxy glue, and the two inner insulating plates 15 are coated with a slip agent on the side in contact with the pole core 1.

[0058] like Figure 8 and Fig.10 As shown, the radial cross-section of the bottom air guide hole 11 is an inverted funnel shape; multiple bottom air guide holes 11 are connected with the ventilation groove 3 at the shroud; the ventilation groove 3 at the shroud is arranged on the yoke 9, and two side guide ventilation holes 6 for guiding cooling air to enter from the bottom air guide hole 11 are arranged in the ventilation groove 3 at the shroud near the bottom air guide hole 11 of the shroud 4; the side guide ventilation holes 6 are connected with the bottom air guide hole 11; the axial dimension range of the inner diameter side of the bottom air guide hole 11 is 10mm~20mm, the circumferential dimension of the inner diameter side is 20mm, the axial dimension range of the outer diameter side is 10mm~20mm, and the circumferential dimension of the outer diameter side is 10mm.

[0059] The number of side ventilation holes 10 set in each row in the axial direction of the shroud 4 is 2 to 3. In order to take into account the rigidity of the shroud 4 and the cooling needs of the pole coil 2, when the number is less than 2, it is not conducive to the heat dissipation of the coil. When the number is more than 3, the rigidity of the shroud 4 itself will be weakened due to too many holes, affecting the safety of the fixed structure of the pole coil 2. The hole shape of the side ventilation holes 10 is a circular hole, a square hole or a waist-shaped hole. The purpose of the side ventilation holes 10 is to ventilate through the shroud 4 and cool the pole coil 2 part at the side of the shroud 4. It is not The shape of the side ventilation holes 10 is limited; the aperture size range of the side ventilation holes 10 along the axial direction of the pole coil 2 is 10mm~30mm, and the aperture size range along the radial direction of the pole coil 2 is 5mm~10mm. The aperture size range can take into account the strength of the belt 4 and the requirements of ventilation and cooling. Exceeding this range will have a negative impact on the strength of the belt 4 itself and the ventilation and cooling effect; the side ventilation holes 10 in each column are evenly spaced on the side of the belt 4 along the radial direction of the pole coil 2, and the distance between the evenly spaced holes is 5 turns of coils to 10 turns of coils.

[0060] like Figure 2 and Figure 8 As shown, the multiple side ventilation holes 10 are all horizontal side ventilation holes, and the horizontal side ventilation holes are evenly arranged from the inner diameter to the outer diameter direction of the pole coil 2, and the center line of the horizontal side ventilation holes is flush with the center line of the circumferential ventilation holes 8 of the pole coil. The cooling air comes out from the circumferential ventilation holes 8 of the pole coil, and then passes through the ventilation holes on the side shroud insulation 14. The cooling air leaves from the horizontal side ventilation holes and finally reaches the channel formed between the poles of the adjacent pole coils 2.

[0061] In addition, as another arrangement method of the plurality of side vents 10, Fig.11As shown, multiple side ventilation holes 10 are inclined side ventilation holes, and the inclined side ventilation holes are evenly arranged in the direction from the inner diameter to the outer diameter of the magnetic pole coil 2; the angle formed by the extension line of the inclined side ventilation holes in the opposite direction of the opening direction of the side of the shroud 4 and the extension line of the opening direction of the circumferential ventilation holes 8 of the magnetic pole coil is 40°~50°; the angle formed by the extension line of the side ventilation holes 10 in the opposite direction of the opening direction of the side of the shroud 4 and the extension line of the opening direction of the circumferential ventilation holes 8 of the magnetic pole coil is A. The angle range is 40°~50°, so A is 40°~50°. The purpose of setting the angle range is to reduce the mutual interference of cooling wind coming out of the side ventilation holes 10 of the belt 4 of adjacent pole coils 2, thereby causing the wind speed to be slow, resulting in reduced cooling effect of the pole coil 2 at the side of the belt 4, so this angle setting achieves the reduction of wind path interference, is more conducive to smooth ventilation, and improves the technical effect of cooling; when the angle setting is lower than 40°, wind path interference is likely to occur; when the angle setting is higher than 50°, the angle between the side ventilation holes 10 and the circumferential ventilation holes 8 of the pole coil is too small, which will increase the wind resistance of the cooling wind inside the pole coil 2.

[0062] The axial width of the belt 4 is 120mm~160mm, and the belt 4 is L-shaped as a whole; if the axial width of the belt 4 is too wide, it will cover too much surface of the pole coil 2, which is not conducive to the heat dissipation of the coil; if the axial width is too narrow, the belt 4 will not be strong enough to fix the pole coil 2.

[0063] Example 2

[0064] A method for improving the temperature rise uniformity of a hydro-generator pole coil comprises the following specific steps:

[0065] Step 1: Start to introduce cooling air from the yoke 9, and the cooling air is divided into a first cooling air path and a second cooling air path;

[0066] Step 2: If Figure 1 As shown, the first cooling air enters from the radial air duct 13 between the yoke segments, directly reaches the radial air duct 12 between the poles, cools the outer surface of the adjacent pole coils 2, and finally reaches the outer side of the pole core 1;

[0067] Step 3: If Figure 1 and Figure 2As shown, the second cooling air enters from the ventilation groove 3 at the shroud on the yoke 9, and is guided to the bottom air guide hole 11 of the shroud 4 through the side guide ventilation hole 6 inside the ventilation groove 3 at the shroud, so as to cool the magnetic pole coil 2 at the bottom of the shroud 4. After the second cooling air enters from the bottom air guide hole 11, it reaches the magnetic pole inner ventilation cavity in the radial air duct 7 on the inner side of the magnetic pole coil, and enters from the magnetic pole coil circumferential ventilation hole 8 of the magnetic pole inner ventilation cavity, so as to cool the inside of the magnetic pole coil 2. Fig.12 As shown, the ventilation holes on the side shroud insulation 14 leave from the side ventilation holes 10 of the shroud 4, cool the pole coils 2 at the side of the shroud 4, and finally reach the channel formed between the poles of the adjacent pole coils 2; Figure 3 As shown, the inner ventilation cavity of the pole is surrounded by two inner insulating plates 15 at the shroud, the inner diameter side shroud insulation 5, the pole coil 2, the bottom edge of the shroud 4 and the pole core 1.

[0068] like Figure 2 As shown, there are multiple circumferential ventilation holes 8 of the pole coil, all of which are arranged on the pole coil 2; each circumferential ventilation hole 8 of the pole coil is connected with the corresponding side ventilation hole 10; the circumferential ventilation holes 8 of the pole coil are connected with the radial air duct 7 on the inner side of the pole coil, and the circumferential ventilation holes 8 of the pole coil are arranged inside the ventilation cavity inside the pole or between two adjacent copper bars.

[0069] The radial air duct 7 on the inner side of the pole coil is the gap formed between the pole coil 2 and the pole core 1 ; the inter-pole radial air duct 12 is the channel formed by the distance between the outer surfaces of adjacent pole coils 2 .

[0070] The protruding parts on both sides of the inner diameter side surrounding band insulation 5 are buckled on both sides of the bottom edge of the surrounding band 4; the two inner insulating plates 15 are arranged between the inner side surface of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are both in contact with the inner side surface of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are located on both sides of the multiple pole coil circumferential ventilation holes 8; the two inner insulating plates 15 are both provided with notches at one end located on the inner diameter side of the pole coil 2, and the notches of the two inner insulating plates 15 are respectively matched and fixed with the protruding parts on both sides of the inner diameter side surrounding band insulation 5.

[0071] There are multiple bottom air guide holes 11; the multiple bottom air guide holes 11 are all connected to the ventilation groove 3 at the shroud, and the multiple bottom air guide holes 11 are all connected to the radial air duct 7 on the inner side of the pole coil; the ventilation groove 3 at the shroud is opened on the yoke 9, and two side guide ventilation holes 6 are opened inside the ventilation groove 3 at the shroud near the bottom air guide hole 11 of the shroud 4 to guide the cooling air to enter from the bottom air guide hole 11; Figure 2As shown, the two side guide ventilation holes 6 divide the second cooling air into two parts of cooling air, and the two parts of cooling air are respectively guided to the bottom air guide holes 11 of the belt 4 of the two adjacent pole coils 2 for cooling air input, so as to cool the pole coils 2 at the bottom of the belt of the two pole coils 2, the inside of the pole coils 2 and the pole coils 2 at the side of the belt, and finally the two parts of cooling air respectively leave from the side ventilation holes 10 of the belt 4 of the corresponding pole coils 2, reach the air duct formed on the outer surface of the adjacent pole coils 2, and finally reach the channel formed between the adjacent pole coils 2.

[0072] Example 3

[0073] like Figure 2 As shown, a device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-turbine generator comprises a shroud 4; a plurality of rows of side ventilation holes 10 are evenly arranged on the shroud 4; a side shroud insulation 14 wrapping the outer surface of the fixed magnetic pole coil 2 along the axial direction of the side of the shroud 4; Fig.12 As shown, a plurality of ventilation holes are provided on the side shroud insulation 14, and each ventilation hole is connected with the corresponding side ventilation hole 10 and the circumferential ventilation hole 8 of the magnetic pole coil; the circumferential ventilation hole 8 of the magnetic pole coil is arranged on the magnetic pole coil 2; the bottom edge of the shroud 4 wraps around the inner diameter side shroud insulation 5 on the inner diameter side of the fixed magnetic pole coil 2; as shown Figure 4 , Figure 5 as well as Figure 6 As shown, the protruding parts on both sides of the inner diameter side insulation 5 are buckled on both sides of the bottom edge of the belt 4, and the belt 4 fixes the inner diameter side insulation; Figure 3 As shown, two inner insulating plates 15 are arranged between the inner side of the pole coil 2 and the pole core 1 at each circumferential band 4, and the two inner insulating plates 15 are both in contact with the inner side of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are located on both sides of the plurality of pole coil circumferential ventilation holes 8; one end of the two inner insulating plates 15 located on the inner diameter side of the pole coil 2 is provided with a notch, as shown in FIG. Figure 7 As shown, Figure 7 The notch in the middle is the bottom notch of the inner insulating plate 15, and the notches at the bottom of the two inner insulating plates 15 are respectively matched and fixed with the protruding parts on both sides of the inner diameter side band insulation 5; the two inner insulating plates 15, the inner diameter side band insulation 5, the pole coil 2, the bottom edge of the band 4 and the pole core 1 form a ventilation cavity inside the pole, through which the cooling air entering from the bottom air guide hole 11 can be prevented from entering from the radial air duct and not entering the circumferential ventilation hole 8 of the pole coil, but flowing out from other places of the pole, causing the loss of cooling air.

[0074] The pole coil 2 is fixed between the shroud 4 and the pole core 1; the end of the side of the shroud 4 is fixed to the pole shoe groove of the pole core 1, and the end of the bottom of the shroud 4 is fixed to the bottom groove of the pole body of the pole core 1. The fixing method of the shroud 4 and the pole core 1 is the existing technology in this field; Fig. 9 As shown, the shroud 4 is provided with a plurality of side ventilation holes 10 along the axial direction of the magnetic pole coil 2, each side ventilation hole 10 is connected with the corresponding magnetic pole coil circumferential ventilation hole 8, and through the opened side ventilation holes 10, when the cooling air passes through the side ventilation holes 10, the magnetic pole coil 2 at the side of the shroud 4 is cooled; the plurality of side ventilation holes 10 in each row are arranged at equal intervals on the shroud 4; Fig.10 As shown, a plurality of bottom air guide holes 11 are provided at the bottom of the shroud 4. When the cooling air passes through the bottom air guide holes 11, the pole coil 2 at the bottom of the shroud 4 is cooled; the plurality of bottom air guide holes 11 are all connected with the radial air duct 7 on the inner side of the pole coil; the pole inner ventilation cavity is located in the radial air duct 7 on the inner side of the pole coil; the radial air duct 7 on the inner side of the pole coil is connected with the circumferential ventilation holes 8 of the pole coil, and the circumferential ventilation holes 8 of the pole coil are arranged inside the pole inner ventilation cavity; the radial air duct 7 on the inner side of the pole coil is the gap formed between the pole coil 2 and the pole core 1.

[0075] The notch at the bottom of the inner insulating plate 15 is a groove opened toward the inside of the inner insulating plate 15, and the two sides of the groove are respectively located at a long protrusion 16 and a short protrusion 17; the long protrusion 16 is longer than the short protrusion 17 along the height direction of the inner insulating plate 15; the short protrusion 17 is in contact with the shroud 4, and the protruding part of the inner diameter side shroud insulation 5 is located between the long protrusion 16 and the short protrusion 17 of the same inner insulating plate 15; the two inner insulating plates 15 are fixed to the pole coil 2 by epoxy glue, and the two inner insulating plates 15 are coated with a slip agent on the side in contact with the pole core 1.

[0076] like Figure 8 and Fig.10 As shown, the radial cross-section of the bottom air guide hole 11 is an inverted funnel shape; multiple bottom air guide holes 11 are connected with the ventilation groove 3 at the shroud; the ventilation groove 3 at the shroud is arranged on the yoke 9, and two side guide ventilation holes 6 for guiding cooling air to enter from the bottom air guide hole 11 are arranged in the ventilation groove 3 at the shroud near the bottom air guide hole 11 of the shroud 4; the side guide ventilation holes 6 are connected with the bottom air guide hole 11; the axial dimension range of the inner diameter side of the bottom air guide hole 11 is 10mm~20mm, the circumferential dimension of the inner diameter side is 20mm, the axial dimension range of the outer diameter side is 10mm~20mm, and the circumferential dimension of the outer diameter side is 10mm.

[0077] The number of side ventilation holes 10 set in each row in the axial direction of the shroud 4 is 2 to 3. In order to take into account the rigidity of the shroud 4 and the cooling needs of the pole coil 2, when the number is less than 2, it is not conducive to the heat dissipation of the coil. When the number is more than 3, the rigidity of the shroud 4 itself will be weakened due to too many holes, affecting the safety of the fixed structure of the pole coil 2. The hole shape of the side ventilation holes 10 is a circular hole, a square hole or a waist-shaped hole. The purpose of the side ventilation holes 10 is to ventilate through the shroud 4 and cool the pole coil 2 part at the side of the shroud 4. It is not The shape of the side ventilation holes 10 is limited; the aperture size range of the side ventilation holes 10 along the axial direction of the pole coil 2 is 10mm~20mm, and the aperture size range along the radial direction of the pole coil 2 is 5mm~10mm. The aperture size range can take into account the strength of the belt 4 and the ventilation and cooling requirements. Exceeding this range will have a negative impact on the strength of the belt 4 itself and the ventilation and cooling effect; the side ventilation holes 10 in each column are evenly spaced on the side of the belt 4 along the radial direction of the pole coil 2, and the distance between the evenly spaced holes is 5 turns of coils to 10 turns of coils.

[0078] like Figure 2 and Figure 8 As shown, the multiple side ventilation holes 10 are all horizontal side ventilation holes, and the horizontal side ventilation holes are evenly arranged from the inner diameter to the outer diameter direction of the pole coil 2, and the center line of the horizontal side ventilation holes is flush with the center line of the circumferential ventilation holes 8 of the pole coil. The cooling air comes out from the circumferential ventilation holes 8 of the pole coil, and then passes through the ventilation holes on the side shroud insulation 14. The cooling air leaves from the horizontal side ventilation holes and finally reaches the channel formed between the poles of the adjacent pole coils 2.

[0079] In addition, as another arrangement method of the plurality of side vents 10, Fig.11As shown, multiple side ventilation holes 10 are inclined side ventilation holes, and the inclined side ventilation holes are evenly arranged in the direction from the inner diameter to the outer diameter of the magnetic pole coil 2; the angle formed by the extension line of the inclined side ventilation holes in the opposite direction of the opening direction of the side of the shroud 4 and the extension line of the opening direction of the circumferential ventilation holes 8 of the magnetic pole coil is 40°~50°; the angle formed by the extension line of the side ventilation holes 10 in the opposite direction of the opening direction of the side of the shroud 4 and the extension line of the opening direction of the circumferential ventilation holes 8 of the magnetic pole coil is A. The angle range is 40°~50°, so A is 40°~50°. The purpose of setting the angle range is to reduce the mutual interference of cooling wind coming out of the side ventilation holes 10 of the belt 4 of adjacent pole coils 2, thereby causing the wind speed to be slow, resulting in reduced cooling effect of the pole coil 2 at the side of the belt 4, so this angle setting achieves the reduction of wind path interference, is more conducive to smooth ventilation, and improves the technical effect of cooling; when the angle setting is lower than 40°, wind path interference is likely to occur; when the angle setting is higher than 50°, the angle between the side ventilation holes 10 and the circumferential ventilation holes 8 of the pole coil is too small, which will increase the wind resistance of the cooling wind inside the pole coil 2.

[0080] The axial width of the belt 4 is 120mm~160mm, and the belt 4 is L-shaped as a whole; if the axial width of the belt 4 is too wide, it will cover too much surface of the pole coil 2, which is not conducive to the heat dissipation of the coil; if the axial width is too narrow, the belt 4 will not be strong enough to fix the pole coil 2.

[0081] A method for improving the temperature rise uniformity of a hydro-generator pole coil comprises the following specific steps:

[0082] Step 1: Start to introduce cooling air from the yoke 9, and the cooling air is divided into a first cooling air path and a second cooling air path;

[0083] Step 2: If Figure 1 As shown, the first cooling air enters from the radial air duct 13 between the yoke segments, directly reaches the radial air duct 12 between the poles, cools the outer surface of the adjacent pole coils 2, and finally reaches the outer side of the pole core 1;

[0084] Step 3: If Figure 1 and Figure 2As shown, the second cooling air enters from the ventilation groove 3 at the shroud on the yoke 9, and is guided to the bottom air guide hole 11 of the shroud 4 through the side guide ventilation hole 6 inside the ventilation groove 3 at the shroud, so as to cool the magnetic pole coil 2 at the bottom of the shroud 4. After the second cooling air enters from the bottom air guide hole 11, it reaches the magnetic pole inner ventilation cavity in the radial air duct 7 on the inner side of the magnetic pole coil, and enters from the magnetic pole coil circumferential ventilation hole 8 of the magnetic pole inner ventilation cavity, so as to cool the inside of the magnetic pole coil 2. Fig.12 As shown, the ventilation holes on the side shroud insulation 14 leave from the side ventilation holes 10 of the shroud 4, cool the pole coils 2 at the side of the shroud 4, and finally reach the channel formed between the poles of the adjacent pole coils 2; Figure 3 As shown, the inner ventilation cavity of the pole is surrounded by two inner insulating plates 15 at the shroud, the inner diameter side shroud insulation 5, the pole coil 2, the bottom edge of the shroud 4 and the pole core 1.

[0085] like Figure 2 As shown, there are multiple circumferential ventilation holes 8 of the pole coil, all of which are arranged on the pole coil 2; each circumferential ventilation hole 8 of the pole coil is connected with the corresponding side ventilation hole 10; the circumferential ventilation holes 8 of the pole coil are connected with the radial air duct 7 on the inner side of the pole coil, and the circumferential ventilation holes 8 of the pole coil are arranged inside the ventilation cavity inside the pole or between two adjacent copper bars.

[0086] The radial air duct 7 on the inner side of the pole coil is the gap formed between the pole coil 2 and the pole core 1 ; the inter-pole radial air duct 12 is the channel formed by the distance between the outer surfaces of adjacent pole coils 2 .

[0087] The protruding parts on both sides of the inner diameter side surrounding band insulation 5 are buckled on both sides of the bottom edge of the surrounding band 4; the two inner insulating plates 15 are arranged between the inner side surface of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are both in contact with the inner side surface of the pole coil 2 and the pole core 1, and the two inner insulating plates 15 are located on both sides of the multiple pole coil circumferential ventilation holes 8; the two inner insulating plates 15 are both provided with notches at one end located on the inner diameter side of the pole coil 2, and the notches of the two inner insulating plates 15 are respectively matched and fixed with the protruding parts on both sides of the inner diameter side surrounding band insulation 5.

[0088] There are multiple bottom air guide holes 11; the multiple bottom air guide holes 11 are all connected to the ventilation groove 3 at the shroud, and the multiple bottom air guide holes 11 are all connected to the radial air duct 7 on the inner side of the pole coil; the ventilation groove 3 at the shroud is opened on the yoke 9, and two side guide ventilation holes 6 are opened inside the ventilation groove 3 at the shroud near the bottom air guide hole 11 of the shroud 4 to guide the cooling air to enter from the bottom air guide hole 11; Figure 2As shown, the two side guide ventilation holes 6 divide the second cooling air into two parts of cooling air, and the two parts of cooling air are respectively guided to the bottom air guide holes 11 of the belt 4 of the two adjacent pole coils 2 for cooling air input, so as to cool the pole coils 2 at the bottom of the belt of the two pole coils 2, the inside of the pole coils 2 and the pole coils 2 at the side of the belt, and finally the two parts of cooling air respectively leave from the side ventilation holes 10 of the belt 4 of the corresponding pole coil 2, reach the air duct formed on the outer surface of the adjacent pole coil 2, and finally reach the channel formed between the adjacent pole coils 2.

[0089] The above description is a detailed description of the preferred feasible embodiment of the present application, but the embodiment is not intended to limit the patent application scope of the present application. All equivalent changes or modified changes made under the technical spirit suggested by the present application should fall within the patent scope covered by the present application.

Claims

1. A device for improving the uniformity of temperature rise of a hydro-generator pole coil, characterized in that: The invention comprises a shroud (4); a plurality of rows of side ventilation holes (10) are evenly arranged on the shroud (4); the side edge of the shroud (4) wraps around the side shroud insulation (14) on the outer surface of the fixed magnetic pole coil (2) in the axial direction; a plurality of ventilation holes are opened on the side shroud insulation (14), and each ventilation hole is connected to the corresponding side ventilation hole (10) and the magnetic pole coil circumferential ventilation hole (8); the magnetic pole coil circumferential ventilation hole (8) is arranged on the magnetic pole coil (2); the bottom edge of the shroud (4) wraps around the inner diameter side shroud of the fixed magnetic pole coil (2) insulation (5); the protruding parts on both sides of the inner diameter side band insulation (5) are buckled on both sides of the bottom edge of the band (4); two inner insulation plates (15) are arranged between the inner side surface of the pole coil (2) and the pole core (1) at each band (4), the two inner insulation plates (15) are both in contact with the inner side surface of the pole coil (2) and the pole core (1), and the two inner insulation plates (15) are located on both sides of the plurality of pole coil circumferential ventilation holes (8); the two inner insulation plates (15) are both provided with a notch at one end located on the inner diameter side of the pole coil (2), The notches of the two inner insulating plates (15) are respectively matched and fixed with the protruding parts on both sides of the inner diameter side surrounding band insulation (5); the two inner insulating plates (15), the inner diameter side surrounding band insulation (5), the magnetic pole coil (2), the bottom edge of the surrounding band (4) and the magnetic pole core (1) form a magnetic pole inner ventilation cavity; the surrounding band (4) is provided with a plurality of side ventilation holes (10) along the axial direction of the magnetic pole coil (2), each side ventilation hole (10) is connected to the corresponding magnetic pole coil circumferential ventilation hole (8); the plurality of side ventilation holes (10) in each row are arranged at equal intervals. The invention relates to a magnetic pole coil having a plurality of bottom air guide holes (11) arranged on the bottom of the magnetic pole coil; the plurality of bottom air guide holes (11) are all connected to the radial air duct (7) on the inner side of the magnetic pole coil; the magnetic pole inner ventilation cavity is located in the radial air duct (7) on the inner side of the magnetic pole coil; the radial air duct (7) on the inner side of the magnetic pole coil is connected to the circumferential ventilation holes (8) on the magnetic pole coil, and the circumferential ventilation holes (8) on the magnetic pole coil are arranged inside the magnetic pole inner ventilation cavity; the radial air duct (7) on the inner side of the magnetic pole coil is a gap formed between the magnetic pole coil (2) and the magnetic pole core (1).

2. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The notch at one end of the inner diameter side of the magnetic pole coil (2) of the inner insulating plate (15) is a groove opened toward the inside of the inner insulating plate (15), and the two sides of the groove are respectively provided with a long protrusion (16) and a short protrusion (17).

3. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 2, characterized in that: The short protrusion (17) fits the shroud (4), and the protruding portion of the inner diameter side shroud insulation (5) is located between the long protrusion (16) and the short protrusion (17) of the same inner insulating plate (15).

4. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The two inner insulating plates (15) are fixed to the magnetic pole coil (2) by epoxy glue, and a slip agent is coated on the surfaces of the two inner insulating plates (15) that are in contact with the magnetic pole core (1).

5. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The radial cross-section of the bottom air guide hole (11) is in the shape of an inverted funnel.

6. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The multiple side ventilation holes (10) are all horizontal side ventilation holes, and the horizontal side ventilation holes are evenly arranged in a direction from the inner diameter to the outer diameter of the magnetic pole coil (2).

7. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The plurality of side ventilation holes (10) are all inclined side ventilation holes, and the inclined side ventilation holes are evenly arranged in a direction from the inner diameter to the outer diameter of the magnetic pole coil (2).

8. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 7, characterized in that: The angle formed by the extension line of the direction opposite to the direction in which the inclined side ventilation holes are opened on the side of the circumferential belt (4) and the extension line of the direction in which the circumferential ventilation holes (8) of the magnetic pole coil are opened is in the range of 40° to 50°.

9. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The number of the side ventilation holes (10) arranged in each row in the axial direction of the shroud (4) is 2 to 3.

10. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 9, characterized in that: The side ventilation holes (10) are in the shape of circular holes, square holes or waist-shaped holes.

11. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The diameter size of the side ventilation holes (10) along the axial direction of the magnetic pole coil (2) ranges from 10 mm to 30 mm, and the diameter size of the side ventilation holes (10) along the radial direction of the magnetic pole coil (2) ranges from 5 mm to 10 mm.

12. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The side ventilation holes (10) in each row are arranged at equal intervals on the side of the shroud (4) along the radial direction of the magnetic pole coil (2), and the distance between the equal intervals is 5 turns of coil to 10 turns of coil.

13. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The plurality of bottom air guide holes (11) are all connected to the ventilation groove (3) at the circumference; the ventilation groove (3) at the circumference is formed on the magnetic yoke (9), and two side guide ventilation holes (6) are formed inside the ventilation groove (3) at the circumference for guiding cooling air to enter from the bottom air guide holes (11).

14. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 13, characterized in that: The bottom air guide hole (11) has an axial dimension range of 10 mm to 20 mm on the inner diameter side, a circumferential dimension range of 20 mm on the inner diameter side, an axial dimension range of 10 mm to 20 mm on the outer diameter side, and a circumferential dimension range of 10 mm to 20 mm on the outer diameter side.

15. The device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The axial width of the shroud (4) is 120 mm to 160 mm, and the shroud (4) is L-shaped as a whole.

16. A method for improving the temperature rise uniformity of a hydro-generator pole coil, characterized in that: The method is implemented based on the device for improving the temperature rise uniformity of the magnetic pole coil of a hydro-turbine generator according to any one of claims 1 to 15, and comprises the following specific steps: Step 1: cooling air is introduced from the magnetic yoke (9), and the cooling air is divided into a first cooling air path and a second cooling air path; Step 2: The first cooling air enters from the radial air duct (13) between the yoke segments, directly reaches the radial air duct (12) between the magnetic poles, cools the outer surfaces of the adjacent magnetic pole coils (2), and finally reaches the outer side of the magnetic pole core (1); Step 3: The second cooling air enters from the ventilation groove (3) at the belt on the yoke (9), and is guided to the bottom air guide hole (11) of the belt (4) through the side guide ventilation hole (6) inside the ventilation groove (3) at the belt. After entering from the bottom air guide hole (11), the second cooling air reaches the magnetic pole inner ventilation cavity in the radial air duct (7) on the inner side of the magnetic pole coil, enters from the magnetic pole coil circumferential ventilation hole (8) in the magnetic pole inner ventilation cavity, passes through the ventilation holes on the side belt insulation (14), and then leaves from the side ventilation hole (10) of the belt (4), and finally reaches the channel formed between the adjacent magnetic pole coils (2); wherein the magnetic pole inner ventilation cavity is surrounded by two inner insulating plates (15) at the belt, the inner diameter side belt insulation (5), the magnetic pole coil (2), the bottom edge of the belt (4) and the magnetic pole core (1).

17. A method for improving the temperature rise uniformity of a hydro-generator pole coil according to claim 16, characterized in that: The magnetic pole coil circumferential ventilation holes (8) are multiple and are all arranged on the magnetic pole coil (2); each magnetic pole coil circumferential ventilation hole (8) is connected to the corresponding side ventilation hole (10); the magnetic pole coil circumferential ventilation holes (8) are connected to the radial air duct (7) on the inner side of the magnetic pole coil, and the magnetic pole coil circumferential ventilation holes (8) are arranged inside the ventilation cavity in the magnetic pole.

18. A method for improving the temperature rise uniformity of a hydro-generator pole coil according to claim 16, characterized in that: The radial air duct (7) on the inner side of the magnetic pole coil is a gap formed between the magnetic pole coil (2) and the magnetic pole core (1); and the inter-pole radial air duct (12) is a channel formed by the distance between the outer surfaces of adjacent magnetic pole coils (2).

19. A method for improving the temperature rise uniformity of a hydro-generator pole coil according to claim 16, characterized in that: The protruding portions on both sides of the inner diameter side surrounding band insulation (5) are buckled on both sides of the bottom edge of the surrounding band (4); two inner insulating plates (15) are arranged between the inner side surface of the pole coil (2) and the pole core (1), the two inner insulating plates (15) are both in contact with the inner side surface of the pole coil (2) and the pole core (1), and the two inner insulating plates (15) are located on both sides of the plurality of pole coil circumferential ventilation holes (8); a notch is provided at one end of the two inner insulating plates (15) located on the inner diameter side of the pole coil (2), and the notches of the two inner insulating plates (15) are respectively matched and fixed with the protruding portions on both sides of the inner diameter side surrounding band insulation (5).

20. The method for improving the temperature rise uniformity of the magnetic pole coil of a hydro-generator according to claim 16, characterized in that: There are a plurality of bottom air guide holes (11); the plurality of bottom air guide holes (11) are all connected to the ventilation groove (3) at the circumference, and the plurality of bottom air guide holes (11) are all connected to the radial air duct (7) on the inner side of the magnetic pole coil; the ventilation groove (3) at the circumference is formed on the magnetic yoke (9), and two side guide ventilation holes (6) are formed inside the ventilation groove (3) at the circumference for guiding cooling air to enter from the bottom air guide holes (11).

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