A device and method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil

Abstract

The present invention relates to the technical field of cooling of high-speed, large-capacity hydro-turbine generators and pumped-storage power generation motors, and specifically to a device and method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil; the device comprises an inter-pole partition plate; an axial pressure equalizing cavity is provided in the middle area of ​​the inter-pole partition plate along the axial direction; an intermediate guide ventilation hole is provided on the axial pressure equalizing cavity, and the axial pressure equalizing cavity is connected with the side guide ventilation hole; the side guide ventilation hole and the intermediate guide ventilation hole are both staggeredly arranged along the axial direction of the inter-pole partition plate; the number of side guide ventilation holes provided on the leeward side of the inter-pole partition plate is greater than the number of side guide ventilation holes provided on the windward side; the axial length of each side guide ventilation hole on the leeward side of the inter-pole partition plate is less than the axial length of each side guide ventilation hole on the windward side; the present invention realizes the adjustment of the air volume and air inlet position of the cooling air, and better reduces the temperature difference between the leeward side and the windward side 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 reducing the temperature difference between the leeward and windward surfaces of a magnetic pole coil. Background Art

[0002] When the rotor of the hydro-turbine generator rotates in a certain direction, the windward side of the outer side of the pole coil is cooled better than the leeward side. 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 is more prominent for high-speed, large-capacity generators and pumped-storage power generation motors in major national hydropower projects with clear plans. Therefore, how to improve the temperature difference between the leeward and windward sides of the pole coil is an issue that needs to be urgently addressed.

[0003] The existing technical solution is to use internal cooling of the pole coil to reduce the temperature difference caused by the difference in cooling conditions between the leeward and windward sides of the pole coil. However, due to the limitation of the yoke air duct structure, it is often difficult to reasonably and effectively distribute and adjust the axial cooling of the pole coil, and it is impossible to further reduce the temperature difference between the leeward and windward sides of the pole coil.

[0004] For example, a Chinese patent application number is 201410024279.7, the application date is January 20, 2014, and the patent name is "A method for internal cooling and external cooling of rotor poles". The technical solution is as follows: the cooling gas flows into the channel between the two pole coils through the ventilation partition device on the air inlet end of the two pole coils to form an external cooling ventilation air 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 air path, and cools the inside of the pole coil, and then flows from the inside of the pole coil to the channel between the two pole coils. The ventilation partition device separates the external cooling ventilation air path and the internal cooling ventilation air path flowing into the channel.

[0005] The above patent separates the internal cooling and external cooling ventilation paths in the channel between the two pole coils, and the internal cooling and external cooling ventilation paths do not interfere with each other, so that the cooling gas of the internal ventilation flows smoothly into the channel between the two pole coils, thereby improving the cooling effect of the entire rotor pole; however, the above patent cannot well improve the cooling effect of the entire rotor pole, thereby well solving the technical problem of excessive temperature difference between the leeward side and the windward side of the pole coil, for the following reasons: 1. The above patent only opens ventilation windows on the ventilation partition device, so that cooling air enters from the ventilation windows to cool the outer surfaces of adjacent pole coils, but no ventilation windows or other cooling air guiding structures are set in the inner air duct between the pole coil and the pole core, so that the cooling air entering the inner air duct is not stable; 2. When the pole is working, there is an inconsistent temperature difference between the leeward side and the windward side of the pole coil, and the comparative patent does not set a suitable ventilation window size and number of ventilation windows to adjust the air volume matching, which will make the cooling of the pole coil uneven, and the overall cooling effect of the pole coil is poor, which ultimately leads to a weakening of the overall cooling effect of the pole. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention proposes a device and method for reducing the temperature difference between the leeward and windward surfaces of a pole coil, which can more effectively reduce the temperature difference between the leeward and windward surfaces of the pole coil and improve the safety of the rotor of a hydro-turbine generator or a generator motor.

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

[0008] A device for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil, comprising an interpole partitioning partition; the interpole partitioning partition is installed between adjacent magnetic pole coils, and an axial pressure equalizing cavity is opened in the middle area of ​​the interpole partitioning partition along the axial direction; an intermediate guide ventilation hole is opened on the axial pressure equalizing cavity to allow cooling air to pass into the magnetic pole coil, and the axial pressure equalizing cavity is connected to the side guide ventilation holes opened on both sides of the interpole partitioning partition; the width dimension of the intermediate guide ventilation hole is smaller than the width dimension of the axial pressure equalizing cavity; the side guide ventilation holes and the intermediate guide ventilation holes are staggered along the axial direction of the interpole partitioning partition; the side guide ventilation holes are arranged at the same time as the magnetic pole coil. The gap formed between the coil and the pole core is connected; the gap formed between the pole coil and the pole core is the radial wind duct of the pole coil; there are multiple circumferential wind ducts of the pole coil, which are opened on the pole coil, and the circumferential wind duct of the pole coil is connected to the radial wind duct of the pole coil and the windward side or leeward side of the pole coil; the two sides of the inter-pole partition partition in the axial direction are the leeward side and the windward side respectively; the number of side guide ventilation holes opened on the leeward side of the inter-pole partition partition is greater than the number of side guide ventilation holes opened on the windward side; the axial length of each side guide ventilation hole on the leeward side of the inter-pole partition partition is less than the axial length of each side guide ventilation hole on the windward side.

[0009] Furthermore, the sum of the axial lengths of all the side guide ventilation holes on the leeward side of the inter-pole partitioning plate is greater than the sum of the axial lengths of all the side guide ventilation holes on the windward side.

[0010] Furthermore, the number of the side guide vents on the leeward side is twice the number of the side guide vents on the windward side.

[0011] Furthermore, a plurality of intermediate guide ventilation holes are opened at equal intervals along the axial direction of the axial pressure equalizing chamber.

[0012] Furthermore, the interval range of the equal spacing between the multiple intermediate guide ventilation holes is 150mm~200mm.

[0013] Furthermore, the opening length of each intermediate guide ventilation hole along the axial direction of the axial pressure equalizing chamber ranges from 30 mm to 60 mm.

[0014] Furthermore, two adjacent side guide vents on the windward side and a side guide vent on the leeward side form a group of side guide vents, and a center line of a side guide vent on the leeward side in the group of side guide vents is highly consistent with a center line of a side guide vent on the windward side in the axial direction of the inter-pole partition partition.

[0015] Furthermore, the axial pressure equalizing cavity is connected to the magnetic yoke radial ventilation holes opened on the magnetic yoke, and the middle guide ventilation holes and the side guide ventilation holes are connected to the magnetic yoke radial ventilation holes.

[0016] Furthermore, the opening length of each side guide ventilation hole along the axial direction of the inter-pole partition plate ranges from 30 mm to 60 mm.

[0017] Furthermore, the axial pressure equalizing chamber is a groove opened in the axial direction of the inter-polar partition plate.

[0018] A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil comprises the following specific steps:

[0019] Step 1: cooling air is introduced from the radial ventilation holes of the yoke, and the cooling air enters the axial pressure equalizing cavity of the inter-pole partition plate;

[0020] Step 2: A portion of the cold air in the axial pressure equalizing cavity enters the middle guide ventilation hole which is smaller than the width of the axial pressure equalizing cavity, and the cold air passes through the windward and leeward surfaces of the adjacent magnetic pole coils to reach the outside of the magnetic pole core;

[0021] Step three: Another part of the cooling air in the axial equalizing pressure cavity enters from the side guide ventilation holes on the windward side of the inter-pole partition plate and the side guide ventilation holes on the leeward side, reaches the radial air duct of the pole coil, enters the circumferential air duct of the pole coil, and then reaches the air duct formed by the windward and leeward sides of the pole coil, and finally reaches the outside of the pole core.

[0022] Furthermore, the radial ventilation holes of the yoke, the axial pressure equalizing cavity and the middle guide ventilation holes of the inter-pole partitioning plate in the steps 2 and 3 are connected to form an inter-pole radial air duct.

[0023] Furthermore, the radial ventilation holes of the yoke, the axial pressure equalizing cavity and the side guide ventilation holes of the inter-pole partitioning plate in the step three are connected to form an inter-pole lateral air duct.

[0024] Furthermore, there are multiple circumferential wind ducts of the pole coil, which are opened on the pole coil, and the circumferential wind ducts of the pole coil are connected to the radial wind duct of the pole coil and the windward side or leeward side of the pole coil.

[0025] Furthermore, the number of the circumferential wind channels of the magnetic pole coil on the leeward side of the magnetic pole coil is 10% to 30% more than the number of the circumferential wind channels of the magnetic pole coil on the windward side of the magnetic pole coil.

[0026] According to the above technical solution, the beneficial effects of the present invention are as follows:

[0027] 1. The inter-pole partitioning partition used in the device of the present invention can adjust the cooling air volume and air inlet position by changing the number, length and position of the middle guide ventilation holes and the side guide ventilation holes on the inter-pole partitioning partition, thereby better reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil.

[0028] 2. In the device of the present invention, an axial pressure equalizing chamber is opened in the axial direction of the inter-pole partition partition. When the cooling air first enters the axial pressure equalizing chamber, the cooling air pressure is equal at each place in the axial pressure equalizing chamber. The cooling air then enters stably from each middle guide ventilation hole and side guide ventilation hole, and the entire pole coil is cooled evenly, thereby reducing the temperature difference between the leeward side and the windward side of the pole coil. Such a structure can also ensure that more radial ventilation ducts do not need to be processed and manufactured on the magnetic yoke, and the purpose of cooling the entire length of the pole coil can be achieved through the axial pressure equalizing chamber.

[0029] 3. The method of the present invention divides the cold air into two parts, thereby achieving cooling of the windward side and leeward side of the pole coil, as well as the inner side and interior of the pole coil, and also achieving uniform cooling of the entire pole coil, and reducing the temperature difference between the leeward side and the windward side of the pole coil.

[0030] 4. The device of the present invention solves the technical problem that the temperature of the leeward side of the pole coil is higher than the temperature of the windward side of the pole coil when the hydro-turbine generator or the generator motor is working by arranging the number of side guide ventilation holes on the windward side and the leeward side of the inter-pole partition partition asymmetrically, thereby ensuring the uniformity of the temperature rise of the pole coil.

[0031] 5. The device of the present invention achieves the staggered arrangement of two different cooling paths of cooling air in the axial direction of the pole coil by staggering the side guide ventilation holes and the middle guide ventilation holes on the inter-pole partition partition, thereby improving the uniformity of cooling of the pole coil and reducing the temperature difference of the pole coil.

[0032] 6. In the method of the present invention, the number of circumferential wind ducts of the pole coil on the leeward side of the pole coil is 10% to 30% greater than the number of circumferential wind ducts of the pole coil on the windward side of the pole coil, so that the cooling air volume on the leeward side of the pole coil is greater than the cooling air volume on the windward side of the pole coil, thereby reducing the temperature difference between the leeward side of the pole coil and the windward side of the pole coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an axial schematic diagram of the interpolar partition plate.

[0034] Figure 2 It is a schematic diagram of the AA radial cross section of the present invention.

[0035] Figure 3 It is a schematic diagram of the BB radial cross section of the present invention.

[0036] In the attached drawings: 1-pole core; 2-pole coil; 3-inter-pole partition plate; 4-windward side; 5-leeward side; 6-inter-pole radial air duct; 7-inter-pole lateral air duct; 8-yoke; 9-pole coil radial air duct; 10-middle guide ventilation hole; 11-side guide ventilation hole; 12-pole coil circumferential air duct; 13-axial equalizing pressure chamber. DETAILED DESCRIPTION

[0037] 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.

[0038] Example 1

[0039] like Figure 1 As shown, Figure 1 for Figure 2 and Figure 3A schematic diagram of the c direction, a device for reducing the temperature difference between the leeward side and the windward side of the pole coil, comprising an inter-pole partition baffle 3; the inter-pole partition baffle 3 is installed between adjacent pole coils 2, and an axial equalizing pressure cavity 13 is opened in the middle area of ​​the inter-pole partition baffle 3 along the axial direction; an intermediate guide ventilation hole 10 is opened on the axial equalizing pressure cavity 13 to allow cooling air to pass into the pole coil 2, and the axial equalizing pressure cavity 13 is connected with the side guide ventilation holes 11 opened on both sides of the inter-pole partition baffle 3; the width dimension of the intermediate guide ventilation hole 10 is smaller than the width dimension of the axial equalizing pressure cavity 13; the side guide ventilation holes 11 and the intermediate guide ventilation holes 10 are both staggered in the axial direction of the inter-pole partition baffle 3; the side guide ventilation holes 11 are connected with the gap formed between the pole coil 2 and the pole core 1; the pole coil 2 and The gap formed between the pole cores 1 is the pole coil radial wind duct 9; there are multiple pole coil circumferential wind ducts 12, which are opened on the pole coil 2, and the pole coil circumferential wind ducts 12 connect the pole coil radial wind duct 9 and the windward side 4 or leeward side 5 of the pole coil 2; the staggered arrangement means that in the same width direction of the inter-pole partition plate 3, there is no overlap in the hole position of the side guide ventilation holes 11 and the middle guide ventilation holes 10. The purpose of the staggered arrangement is to ventilate through the middle guide ventilation holes 10 and the side guide ventilation holes 11, so that the surface of the pole coil 2 and the inside of the pole coil 2 are cooled, and the middle guide ventilation holes 10 and the side guide ventilation holes 11 can be alternately ventilated in the axial direction, thereby improving the uniformity of cooling the pole coil 2 and reducing the overall temperature difference of the pole coil 2.

[0040] The two sides of the inter-pole partition partition 3 in the axial direction are respectively the leeward side and the windward side; wherein, the leeward side of the inter-pole partition partition 3 is the side close to the leeward surface 5 of the magnetic pole coil 2; the windward side of the inter-pole partition partition 3 is the side close to the windward surface 4 of the magnetic pole coil 2; the number of side guide ventilation holes 11 opened on the leeward side of the inter-pole partition partition 3 is greater than the number of side guide ventilation holes 11 opened on the windward side; the axial length of each side guide ventilation hole 11 on the leeward side of the inter-pole partition partition 3 is less than the axial length of each side guide ventilation hole 11 on the windward side.

[0041] The sum of the axial lengths of all the side guide ventilation holes 11 on the leeward side of the inter-pole partition plate 3 is greater than the sum of the axial lengths of all the side guide ventilation holes 11 on the windward side, so that the air intake on the leeward side is greater than the air intake on the windward side, thereby reducing the temperature difference between the windward surface 4 and the leeward surface 5 of the magnetic pole coil; the number of the side guide ventilation holes 11 opened on the leeward side is twice the number of the side guide ventilation holes 11 opened on the windward side; Figure 1As shown, assuming that the length of each side guide vent hole 11 on the leeward side is H1, the number of the side guide vent holes 11 on the leeward side is N1, the length of each side guide vent hole 11 on the windward side is H2, and the number of the side guide vent holes 11 on the windward side is N2, then N1=2N2; if the length H1 of each side guide vent hole 11 on the leeward side is 3 / 4 of the length H2 of each side guide vent hole 11 on the windward side, then N1·H1=1.5N2·H2; When the magnetic pole is working, the temperature of the magnetic pole coil 2 on the leeward side will be higher than the temperature of the magnetic pole coil 2 on the windward side. The purpose of setting the sum of the axial lengths of all the side guide ventilation holes 11 on the leeward side of the interpole partition partition 3 to be greater than the sum of the axial lengths of all the side guide ventilation holes 11 on the windward side is to keep the ventilation volume of the leeward side 5 of the magnetic pole coil 2 greater than the ventilation volume of the windward side 4 of the magnetic pole coil 2, so as to reduce the temperature difference between the leeward side 5 of the magnetic pole coil 2 and the windward side 4 of the magnetic pole coil 2.

[0042] Two adjacent side guide vents 11 on the windward side and a side guide vent 11 on the leeward side constitute a group of side guide vents 11, and a center line of a side guide vent 11 on the leeward side in the group of side guide vents 11 is highly consistent with a center line of a side guide vent 11 on the windward side in the axial direction of the inter-pole partition plate 3.

[0043] A plurality of intermediate guide ventilation holes 10 are opened at equal intervals along the axial direction of the axial pressure equalizing chamber 13; the interval range of the equal intervals between the plurality of intermediate guide ventilation holes 10 is 150mm~200mm; the interval range here is set by comprehensively considering the cooling requirements and structural feasibility of multiple parts of the pole coil 2. If the interval is less than 150mm, the intermediate guide ventilation holes 10 are arranged too densely, and the interval with the side guide ventilation holes 11 will be too small, and the corresponding interval between the circumferential air ducts 12 of the pole coil will also be too small. At this time, on the one hand, there will be a problem that the air paths between the inter-pole radial air duct 6 ventilation and the internal ventilation of the pole coil 2 are too close and interfere with each other. On the other hand, the internal openings of the pole coil 2 are too dense, which weakens its own rigidity too much, making it difficult to process and manufacture, and is not conducive to the mechanical safety of the pole coil 2; if the interval is greater than 200mm, the number of intermediate guide ventilation holes 10 is reduced, and the number of side guide ventilation holes 11 will also be reduced, which will affect the cooling effect of the pole coil 2.

[0044] The opening length range of each intermediate guide ventilation hole 10 along the axial direction of the axial equalizing pressure chamber 13 is 30mm~60mm. The axial equalizing pressure chamber 13 is connected with the yoke radial ventilation hole opened on the yoke 8, and the intermediate guide ventilation hole 10 and the side guide ventilation hole 11 are connected with the yoke radial ventilation hole; the opening length range of each side guide ventilation hole 11 along the axial direction of the inter-pole partition partition 3 is 30mm~60mm, and the height of the ventilation hole is adapted to the spacing and height of the intermediate guide ventilation hole 10, and the setting of the circumferential wind duct 12 of the pole coil is also considered; if the opening height range is less than 30mm, the wind resistance generated is large, the air volume is too small, which is not conducive to the cooling of the pole coil 2; if the opening height range is greater than 60mm, it is limited by the size of the circumferential wind duct 12 of the pole coil, and the increase part will not produce obvious cooling benefits, and will also weaken the structural strength of the inter-pole partition partition 3 itself.

[0045] The axial pressure equalizing chamber 13 is a groove opened in the axial direction of the inter-polar partition plate 3 .

[0046] Example 2

[0047] like Figure 2 and Figure 3 As shown, Figure 2 for Figure 1 AA cross-section diagram, Figure 3 for Figure 1 A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil comprises the following specific steps:

[0048] Step 1: Start to let cooling air in from the radial ventilation holes of the yoke 8. The cooling air enters into the axial pressure equalizing cavity 13 of the inter-pole partition partition 3, so that the cooling air maintains uniform pressure in the axial pressure equalizing cavity 13 and is more stably input into the middle guide ventilation holes 10 and the side guide ventilation holes 11.

[0049] Step 2: If Figure 3 As shown, a portion of the cold air in the axial pressure equalizing cavity 13 enters the intermediate guide vent hole 10 which is smaller than the width of the axial pressure equalizing cavity 13, and the cold air passes through the windward surface 4 and the leeward surface 5 of the adjacent magnetic pole coils 2 to form the wind channel, and then reaches the outside of the magnetic pole core 1;

[0050] Step 3: If Figure 2 As shown, another part of the cooling air in the axial equalizing pressure cavity 13 enters from the side guide ventilation holes 11 on the windward side of the inter-pole partition partition 3 and the side guide ventilation holes 11 on the leeward side, reaches the radial air duct 9 of the pole coil, enters the circumferential air duct 12 of the pole coil, and then reaches the air duct formed by the windward surface 4 and the leeward surface 5 of the pole coil 2, and finally reaches the outside of the pole core 1.

[0051] The radial ventilation holes of the yoke, the axial pressure equalizing cavity 13 and the middle guide ventilation holes 10 of the inter-pole partitioning partition 3 in step 2 and step 3 are connected to form an inter-pole radial air duct 6 .

[0052] The radial ventilation holes of the yoke, the axial pressure equalizing cavity 13 and the side guide ventilation holes 11 of the inter-pole partition plate 3 in step three are connected to form the inter-pole lateral air duct 7 .

[0053] There are multiple pole coil circumferential wind ducts 12 opened on the pole coil 2 , and the pole coil circumferential wind ducts 12 connect the pole coil radial wind duct 9 and the windward surface 4 or the leeward surface 5 of the pole coil 2 .

[0054] The number of the pole coil circumferential wind passages 12 on the leeward side 5 of the pole coil 2 is 10% to 30% greater than the number of the pole coil circumferential wind passages 12 on the windward side 4 of the pole coil 2 .

[0055] Example 3

[0056] like Figure 1 As shown, Figure 1 for Figure 2 and Figure 3 A schematic diagram of the c direction, a device for reducing the temperature difference between the leeward side and the windward side of the pole coil, comprising an inter-pole partition baffle 3; the inter-pole partition baffle 3 is installed between adjacent pole coils 2, and an axial equalizing pressure cavity 13 is opened in the middle area of ​​the inter-pole partition baffle 3 along the axial direction; an intermediate guide ventilation hole 10 is opened on the axial equalizing pressure cavity 13 to allow cooling air to pass into the pole coil 2, and the axial equalizing pressure cavity 13 is connected with the side guide ventilation holes 11 opened on both sides of the inter-pole partition baffle 3; the width dimension of the intermediate guide ventilation hole 10 is smaller than the width dimension of the axial equalizing pressure cavity 13; the side guide ventilation holes 11 and the intermediate guide ventilation holes 10 are both staggered in the axial direction of the inter-pole partition baffle 3; the side guide ventilation holes 11 are connected with the gap formed between the pole coil 2 and the pole core 1; the pole coil 2 and The gap formed between the pole cores 1 is the pole coil radial wind duct 9; there are multiple pole coil circumferential wind ducts 12, which are opened on the pole coil 2, and the pole coil circumferential wind ducts 12 connect the pole coil radial wind duct 9 and the windward side 4 or leeward side 5 of the pole coil 2; the staggered arrangement means that in the same width direction of the inter-pole partition plate 3, there is no overlap in the hole position of the side guide ventilation holes 11 and the middle guide ventilation holes 10. The purpose of the staggered arrangement is to ventilate through the middle guide ventilation holes 10 and the side guide ventilation holes 11, so that the surface of the pole coil 2 and the inside of the pole coil 2 are cooled, and the middle guide ventilation holes 10 and the side guide ventilation holes 11 can be alternately ventilated in the axial direction, thereby improving the uniformity of cooling the pole coil 2 and reducing the overall temperature difference of the pole coil 2.

[0057] The two sides of the inter-pole partition partition 3 in the axial direction are respectively the leeward side and the windward side; wherein, the leeward side of the inter-pole partition partition 3 is the side close to the leeward surface 5 of the magnetic pole coil 2; the windward side of the inter-pole partition partition 3 is the side close to the windward surface 4 of the magnetic pole coil 2; the number of side guide ventilation holes 11 opened on the leeward side of the inter-pole partition partition 3 is greater than the number of side guide ventilation holes 11 opened on the windward side; the axial length of each side guide ventilation hole 11 on the leeward side of the inter-pole partition partition 3 is less than the axial length of each side guide ventilation hole 11 on the windward side.

[0058] The sum of the axial lengths of all the side guide ventilation holes 11 on the leeward side of the inter-pole partition plate 3 is greater than the sum of the axial lengths of all the side guide ventilation holes 11 on the windward side, so that the air intake on the leeward side is greater than the air intake on the windward side, thereby reducing the temperature difference between the windward surface 4 and the leeward surface 5 of the magnetic pole coil; the number of the side guide ventilation holes 11 opened on the leeward side is twice the number of the side guide ventilation holes 11 opened on the windward side; Figure 3 As shown, assuming that the length of each side guide vent hole 11 on the leeward side is H1, the number of the side guide vent holes 11 on the leeward side is N1, the length of each side guide vent hole 11 on the windward side is H2, and the number of the side guide vent holes 11 on the windward side is N2, then N1=2N2; if the length H1 of each side guide vent hole 11 on the leeward side is 3 / 4 of the length H2 of each side guide vent hole 11 on the windward side, then N1·H1=1.5N2·H2; When the magnetic pole is working, the temperature of the magnetic pole coil 2 on the leeward side will be higher than the temperature of the magnetic pole coil 2 on the windward side. The purpose of setting the sum of the axial lengths of all the side guide ventilation holes 11 on the leeward side of the interpole partition partition 3 to be greater than the sum of the axial lengths of all the side guide ventilation holes 11 on the windward side is to keep the ventilation volume of the leeward side 5 of the magnetic pole coil 2 greater than the ventilation volume of the windward side 4 of the magnetic pole coil 2, so as to reduce the temperature difference between the leeward side 5 of the magnetic pole coil 2 and the windward side 4 of the magnetic pole coil 2.

[0059] Two adjacent side guide vents 11 on the windward side and a side guide vent 11 on the leeward side constitute a group of side guide vents 11, and a center line of a side guide vent 11 on the leeward side in the group of side guide vents 11 is highly consistent with a center line of a side guide vent 11 on the windward side in the axial direction of the inter-pole partition plate 3.

[0060] A plurality of intermediate guide ventilation holes 10 are opened at equal intervals along the axial direction of the axial pressure equalizing chamber 13; the interval range of the equal intervals between the plurality of intermediate guide ventilation holes 10 is 150mm~200mm; the interval range here is set by comprehensively considering the cooling requirements and structural feasibility of multiple parts of the pole coil 2. If the interval is less than 150mm, the intermediate guide ventilation holes 10 are arranged too densely, and the interval with the side guide ventilation holes 11 will be too small, and the corresponding interval between the circumferential air ducts 12 of the pole coil will also be too small. At this time, on the one hand, there will be a problem that the air paths between the inter-pole radial air duct 6 ventilation and the internal ventilation of the pole coil 2 are too close and interfere with each other. On the other hand, the internal openings of the pole coil 2 are too dense, which weakens its own rigidity too much, making it difficult to process and manufacture, and is not conducive to the mechanical safety of the pole coil 2; if the interval is greater than 200mm, the number of intermediate guide ventilation holes 10 is reduced, and the number of side guide ventilation holes 11 will also be reduced, which will affect the cooling effect of the pole coil 2.

[0061] The opening length range of each intermediate guide ventilation hole 10 along the axial direction of the axial equalizing pressure chamber 13 is 30mm~60mm. The axial equalizing pressure chamber 13 is connected with the yoke radial ventilation hole opened on the yoke 8, and the intermediate guide ventilation hole 10 and the side guide ventilation hole 11 are connected with the yoke radial ventilation hole; the opening length range of each side guide ventilation hole 11 along the axial direction of the inter-pole partition partition 3 is 30mm~60mm, and the height of the ventilation hole is adapted to the spacing and height of the intermediate guide ventilation hole 10, and the setting of the circumferential wind duct 12 of the pole coil is also considered; if the opening height range is less than 30mm, the wind resistance generated is large, the air volume is too small, which is not conducive to the cooling of the pole coil 2; if the opening height range is greater than 60mm, it is limited by the size of the circumferential wind duct 12 of the pole coil, and the increase part will not produce obvious cooling benefits, and will also weaken the structural strength of the inter-pole partition partition 3 itself.

[0062] The axial pressure equalizing chamber 13 is a groove opened in the axial direction of the inter-polar partition plate 3 .

[0063] like Figure 2 and Figure 3 As shown, Figure 2 for Figure 1 AA cross-section diagram, Figure 3 for Figure 1 A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil comprises the following specific steps:

[0064] Step 1: Start to let cooling air in from the radial ventilation holes of the yoke 8. The cooling air enters into the axial pressure equalizing cavity 13 of the inter-pole partition partition 3, so that the cooling air maintains uniform pressure in the axial pressure equalizing cavity 13 and is more stably input into the middle guide ventilation holes 10 and the side guide ventilation holes 11.

[0065] Step 2: If Figure 3 As shown, a portion of the cold air in the axial pressure equalizing cavity 13 enters the intermediate guide vent hole 10 which is smaller than the width of the axial pressure equalizing cavity 13, and the cold air passes through the windward surface 4 and the leeward surface 5 of the adjacent magnetic pole coils 2 to form the wind channel, and then reaches the outside of the magnetic pole core 1;

[0066] Step 3: If Figure 2 As shown, another part of the cooling air in the axial equalizing pressure cavity 13 enters from the side guide ventilation holes 11 on the windward side of the inter-pole partition partition 3 and the side guide ventilation holes 11 on the leeward side, reaches the radial air duct 9 of the pole coil, enters the circumferential air duct 12 of the pole coil, and then reaches the air duct formed by the windward surface 4 and the leeward surface 5 of the pole coil 2, and finally reaches the outside of the pole core 1.

[0067] The radial ventilation holes of the yoke, the axial pressure equalizing cavity 13 and the middle guide ventilation holes 10 of the inter-pole partitioning partition 3 in step 2 and step 3 are connected to form an inter-pole radial air duct 6 .

[0068] The radial ventilation holes of the yoke, the axial pressure equalizing cavity 13 and the side guide ventilation holes 11 of the inter-pole partition plate 3 in step three are connected to form the inter-pole lateral air duct 7 .

[0069] There are multiple pole coil circumferential wind ducts 12 opened on the pole coil 2 , and the pole coil circumferential wind ducts 12 connect the pole coil radial wind duct 9 and the windward surface 4 or the leeward surface 5 of the pole coil 2 .

[0070] The number of the pole coil circumferential wind passages 12 on the leeward side 5 of the pole coil 2 is 10% to 30% greater than the number of the pole coil circumferential wind passages 12 on the windward side 4 of the pole coil 2 .

[0071] 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 scope of the patent application of the present application. Any changes or modifications to the technical spirit suggested by the present application should fall within the scope of the patent covered by the present application.

Claims

1. A device for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil, characterized in that: The invention comprises an inter-pole partition plate (3); the inter-pole partition plate (3) is installed between adjacent magnetic pole coils (2); an axial pressure equalizing cavity (13) is provided in the middle region of the inter-pole partition plate (3) along the axial direction; an intermediate guide ventilation hole (10) is provided on the axial pressure equalizing cavity (13) for allowing cooling air to flow into the magnetic pole coil (2), and the axial pressure equalizing cavity (13) is connected to the side guide ventilation holes (11) provided on both sides of the inter-pole partition plate (3); the width dimension of the intermediate guide ventilation hole (10) is smaller than the width dimension of the axial pressure equalizing cavity (13); the side guide ventilation holes (11) and the intermediate guide ventilation holes (10) are arranged in an offset manner along the axial direction of the inter-pole partition plate (3); the side guide ventilation holes (11) are connected to the gap formed between the magnetic pole coil (2) and the magnetic pole core (1); the gap formed between the magnetic pole coil (2) and the magnetic pole core (1) The gap is a magnetic pole coil radial wind duct (9); there are a plurality of magnetic pole coil circumferential wind ducts (12) which are opened on the magnetic pole coil (2), and the magnetic pole coil circumferential wind duct (12) is connected to the magnetic pole coil radial wind duct (9) and the windward surface (4) or the leeward surface (5) of the magnetic pole coil (2) to form a wind duct; the two sides of the inter-pole partitioning baffle (3) in the axial direction are respectively the leeward side and the windward side; the number of side guide ventilation holes (11) opened on the leeward side of the inter-pole partitioning baffle (3) is greater than the number of side guide ventilation holes (11) opened on the windward side; the axial length of each side guide ventilation hole (11) on the leeward side of the inter-pole partitioning baffle (3) is less than the axial length of each side guide ventilation hole (11) on the windward side; the sum of the axial lengths of all the side guide ventilation holes (11) on the leeward side of the inter-pole partitioning baffle (3) is greater than the sum of the axial lengths of all the side guide ventilation holes (11) on the windward side.

2. A device for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 1, characterized in that: The number of the side guide ventilation holes (11) opened on the leeward side is twice the number of the side guide ventilation holes (11) opened on the windward side.

3. The device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to claim 1, characterized in that: A plurality of intermediate guide ventilation holes (10) are provided at equal intervals along the axial direction of the axial pressure equalizing cavity (13).

4. A device for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 3, characterized in that: The intervals between the multiple intermediate guide ventilation holes (10) are equally spaced in a range of 150 mm to 200 mm.

5. The device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to claim 3, characterized in that: The opening length of each intermediate guide ventilation hole (10) along the axial direction of the axial pressure equalizing cavity (13) ranges from 30 mm to 60 mm.

6. The device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to claim 2, characterized in that: Two adjacent side guide ventilation holes (11) on the windward side and one side guide ventilation hole (11) on the leeward side form a group of side guide ventilation holes (11), and a center line of a side guide ventilation hole (11) on the leeward side of the group of side guide ventilation holes (11) is highly consistent with a center line of a side guide ventilation hole (11) on the windward side in the axial direction of the inter-pole partition plate (3).

7. The device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to claim 1, characterized in that: The axial pressure equalizing cavity (13) is connected to the magnetic yoke radial ventilation holes opened on the magnetic yoke (8), and the middle guide ventilation holes (10) and the side guide ventilation holes (11) are connected to the magnetic yoke radial ventilation holes.

8. The device for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 1, characterized in that: The opening length of each side guide ventilation hole (11) along the axial direction of the inter-pole partition plate (3) ranges from 30 mm to 60 mm.

9. The device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to claim 7, characterized in that: The axial pressure equalizing cavity (13) is a groove formed in the axial direction of the inter-polar partitioning plate (3).

10. A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil, characterized in that: The method is implemented based on the device for reducing the temperature difference between the leeward side and the windward side of the magnetic pole coil according to any one of claims 1 to 9, and comprises the following specific steps: Step 1: cooling air is introduced from the radial ventilation holes of the magnetic yoke (8), and the cooling air enters the axial pressure equalizing cavity (13) of the inter-pole partition plate (3); Step 2: a portion of the cold air in the axial pressure equalizing chamber (13) enters the intermediate guide ventilation hole (10) which is smaller than the width of the axial pressure equalizing chamber (13), and the cold air passes through the wind duct formed by the windward surface (4) and the leeward surface (5) of the adjacent magnetic pole coils (2), and then reaches the outer side of the magnetic pole core (1); Step 3: Another part of the cooling air in the axial pressure equalizing cavity (13) enters from the side guide ventilation holes (11) on the windward side and the side guide ventilation holes (11) on the leeward side of the inter-pole partitioning partition (3), reaches the radial air duct (9) of the magnetic pole coil, enters the circumferential air duct (12) of the magnetic pole coil, and then reaches the air duct formed by the windward surface (4) and the leeward surface (5) of the magnetic pole coil (2), and finally reaches the outside of the magnetic pole core (1).

11. A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 10, characterized in that: The radial ventilation holes of the magnetic yoke, the axial pressure equalizing cavity (13) and the middle guide ventilation holes (10) of the inter-pole partitioning plate (3) in the second and third steps are connected to form an inter-pole radial air duct (6).

12. A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 10, characterized in that: The radial ventilation holes of the magnetic yoke, the axial pressure equalizing cavity (13) and the side guide ventilation holes (11) of the inter-pole partitioning partition (3) in step three are connected to form an inter-pole lateral air duct (7).

13. A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 10, characterized in that: There are a plurality of magnetic pole coil circumferential wind ducts (12) which are arranged on the magnetic pole coil (2), and the magnetic pole coil circumferential wind duct (12) is connected to the magnetic pole coil radial wind duct (9) and the windward surface (4) or the leeward surface (5) of the magnetic pole coil (2).

14. A method for reducing the temperature difference between the leeward side and the windward side of a magnetic pole coil according to claim 10, characterized in that: The number of the magnetic pole coil circumferential wind ducts (12) on the leeward side (5) of the magnetic pole coil (2) is 10% to 30% greater than the number of the magnetic pole coil circumferential wind ducts (12) on the windward side (4) of the magnetic pole coil (2).

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