Rotor cooling device

Abstract

The utility model relates to the technical field of vehicles, in particular to a rotor cooling device which comprises a rotor shaft provided with an inner cavity and used for conveying cooling oil; the rotor shaft is provided with a plurality of first shaft oil holes distributed in the circumferential direction. The rotor shaft is sleeved with the at least two sections of rotor iron cores, the rotor iron cores are arranged on the outer side of the rotor shaft in a sleeving mode, each rotor iron core comprises a plurality of permanent magnet sets, and a de-weighting hole is formed in each permanent magnet set; the oil guide plate is arranged on the outer side of the rotor shaft in a sleeving manner and is positioned between the two sections of rotor iron cores; the oil guide plate is provided with a plurality of first oil guide grooves which are in one-to-one correspondence with the shaft oil hole in the radial direction; the oil guide plate further comprises a plurality of first oil holes, the first oil holes communicate with the first oil guide groove, and the first oil holes communicate with the de-weight holes of the permanent magnet sets in a one-to-one correspondence mode and are used for enabling cooling oil to flow into the permanent magnet sets on the two sides of the oil guide plate. According to the invention, the oil path is designed in the de-weight hole part in the permanent magnet group, so that the permanent magnets are fully cooled on the basis of ensuring that the original structure of the rotor core is not changed.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and in particular, to a rotor cooling device. Background Art

[0002] High power density and high torque density motors are the long-term development trend of today's new energy vehicle drive systems. However, the ultimate power of motors is often limited by the temperature rise of the motors, and their performance will gradually decay as the temperature rises. Therefore, improving the cooling and heat dissipation ability of motors is very meaningful for improving the power density of motors.

[0003] The oil cooling method is a cooling method that directly acts the cooling oil on the internal components of the drive system. Compared with the commonly used water cooling method, its advantage is that the oil is non-conductive and non-magnetic, has better insulation performance, and can directly contact the high-temperature concentrated components inside the motor, such as the stator winding ends, the rotor area, etc., for more complete heat exchange, with higher heat dissipation efficiency, and can better meet the cooling requirements of today's drive systems. The oil cooling effect of the motor is closely related to the oil circuit design of the drive system. A good oil circuit design can reasonably distribute the cooling oil flow of each component to achieve a sufficient cooling effect. Otherwise, it will result in poor heat dissipation and damage to the parts.

[0004] During the operation of the drive system, the heat generation of the stator mainly comes from the windings, while the heat generation of the rotor mainly comes from the permanent magnets. Compared with the design where the stator winding ends are exposed, the permanent magnets are arranged inside the iron core and often cannot be sufficiently cooled, resulting in poor heat dissipation and affecting the performance of the permanent magnets. Summary of the Invention

[0005] The embodiment of the present application provides a rotor cooling device, which is used to design an oil circuit inside the anti-leakage magnetic and weight-reducing holes of the iron core to achieve sufficient cooling of the permanent magnets.

[0006] According to a rotor cooling device provided by the present application, it includes: a rotor shaft, the rotor shaft has an inner cavity for transmitting cooling oil; the rotor shaft has a plurality of first shaft oil holes distributed circumferentially; at least two sections of rotor iron cores, the rotor iron cores are sleeved outside the rotor shaft, the rotor iron cores include a plurality of permanent magnet groups, and each permanent magnet group has a weight-reducing hole inside; an oil guide plate, the oil guide plate is sleeved outside the rotor shaft and is located between two sections of rotor iron cores; the oil guide plate has a plurality of first oil guide grooves, and the first oil guide grooves correspond to the first shaft oil holes radially one by one; the oil guide plate further includes a plurality of first oil holes, the first oil holes are communicated with the first oil guide grooves, and the plurality of first oil holes are communicated with the weight-reducing holes of the plurality of permanent magnet groups one by one, for flowing the cooling oil into the inside of the permanent magnet groups on both sides of the oil guide plate.

[0007] In one embodiment, the rotor iron core further includes: a first positioning component, and the oil guide plate further includes a second positioning component; the first positioning component and the second positioning component are axially aligned.

[0008] In one embodiment, it further includes: a first balance plate located on one side of at least two rotor cores; the first balance plate includes a plurality of first oil channels, a plurality of fourth oil holes, and the fourth oil holes and the first oil channels are arranged alternately; a plurality of second oil guiding grooves, the middle of the second oil guiding grooves is communicated with the fourth oil holes, and the two ends of the second oil guiding grooves are respectively and correspondingly communicated with the weight removal holes of two adjacent permanent magnet groups; the rotor shaft further includes a plurality of second shaft oil holes circumferentially distributed on the rotor shaft; one ends of the plurality of first oil channels are radially and correspondingly communicated with the plurality of second shaft oil holes respectively for passing cooling oil into the first oil channels; the rotor core further includes a plurality of second oil holes, and the second oil holes and the weight removal holes are arranged alternately; the other ends of the plurality of first oil channels are correspondingly communicated with the plurality of second oil holes respectively, and the plurality of fourth oil holes are correspondingly communicated with the plurality of second oil holes respectively; the oil guiding plate further includes a plurality of third oil holes, the third oil holes and the first oil holes are arranged alternately, and the plurality of third oil holes are correspondingly communicated with the plurality of second oil holes respectively.

[0009] In one embodiment, the first balance plate further includes: a third positioning component, and the third positioning component is axially aligned with the second positioning component of the oil guiding plate and the first positioning component of the rotor core.

[0010] In one embodiment, the rotor shaft further includes a plurality of third shaft oil holes circumferentially distributed on the rotor shaft; the rotor cooling device further includes: a second balance plate located on the other side of at least two rotor cores, and the second balance plate includes: a plurality of second oil channels, one ends of the plurality of second oil channels are radially and correspondingly communicated with the plurality of third shaft oil holes respectively for passing cooling oil into the second oil channels; the other ends of the plurality of second oil channels are correspondingly communicated with the plurality of second oil holes respectively; a plurality of fifth oil holes, the fifth oil holes and the second oil channels are arranged alternately, and the plurality of fifth oil holes are correspondingly communicated with the plurality of second oil holes respectively; the plurality of fifth oil holes are correspondingly communicated with the other ends of the plurality of first oil channels respectively; the other ends of the plurality of second oil channels are correspondingly communicated with the plurality of fourth oil holes respectively; a plurality of third oil guiding grooves, the middle of the third oil guiding grooves is communicated with the fifth oil holes, and the two ends of the third oil guiding grooves are respectively and correspondingly communicated with the weight removal holes of two adjacent permanent magnet groups.

[0011] In one embodiment, the second balance plate further includes: a fourth positioning component, and the fourth positioning component is axially aligned with the second positioning component of the oil guiding plate, the first positioning component of the rotor core, and the third positioning component of the first balance plate.

[0012] In one embodiment, the rotor shaft includes a shoulder and a key groove located on the shoulder; the fourth positioning component includes: a boss located on the second balance plate, and the boss is installed and matched with the key groove for fixing the second balance plate.

[0013] In one embodiment, the first oil guiding groove includes: a plurality of first grooves, which correspond to a plurality of first shaft oil holes one by one; a second groove, which is annular and connects the plurality of first grooves; a plurality of third grooves, which are V-shaped, and both ends of the third grooves communicate with the second groove, and a plurality of first oil holes are respectively located at the tops of the plurality of third grooves.

[0014] In one embodiment, the rotor shaft further includes: an oil guiding pipe, which is arranged inside the inner cavity of the rotor shaft, and the oil guiding pipe has circumferentially distributed sixth oil holes for flowing the cooling oil in the oil guiding pipe into the inner cavity of the rotor shaft.

[0015] In one embodiment, the rotor shaft further includes: a bowl-shaped plug, which is located at one end opposite to the oil inlet of the rotor shaft and is used to prevent the cooling oil in the inner cavity of the rotor shaft from flowing out.

[0016] The technical solution provided by the embodiment of the present application, through the structure in which the rotor shaft and the oil guiding plate are communicated with each other through a plurality of first shaft oil holes corresponding to a plurality of first oil guiding grooves one by one, and the oil guiding plate and the rotor cores on both sides of the oil guiding plate are communicated with a plurality of de-duplication holes in a plurality of permanent magnet groups through a plurality of first oil guiding grooves one by one, achieves the effect of fully cooling the permanent magnets by cooling the oil inside the permanent magnet group on the basis of keeping the original structure of the rotor core unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below.

[0018] Figure 1 is a three-dimensional sectional schematic view of a rotor cooling device provided by an embodiment of the present application;

[0019] Figure 2 is a schematic structural view of a rotor core of a rotor cooling device provided by an embodiment of the present application;

[0020] Figure 3 is a schematic plan view of an oil guiding plate of a rotor cooling device provided by an embodiment of the present application;

[0021] Figure 4 is a three-dimensional structural view of an oil guiding plate of a rotor cooling device provided by an embodiment of the present application;

[0022] Figure 5 is a schematic plan view of a first balance plate of a rotor cooling device provided by an embodiment of the present application;

[0023] Figure 6 is a three-dimensional structural view of a first balance plate of a rotor cooling device provided by an embodiment of the present application;

[0024] Figure 7Schematic diagram of the positioning and installation of the first balance plate and the rotor core of the rotor cooling device provided by an embodiment of the present application;

[0025] Figure 8 Schematic plan view of the second balance plate of the rotor cooling device provided by an embodiment of the present application;

[0026] Figure 9 Schematic diagram of the positioning components of the second balance plate of the rotor cooling device provided by an embodiment of the present application;

[0027] Figure 10 Schematic diagram of the installation and positioning of the second balance plate and the rotor shaft of the rotor cooling device provided by an embodiment of the present application;

[0028] Figure 11 Schematic diagram of the oil path 1 of the rotor cooling device provided by an embodiment of the present application;

[0029] Figure 12 Schematic diagram of the oil path 2 of the rotor cooling device provided by an embodiment of the present application;

[0030] Figure 13 Schematic diagram of the oil path 3 of the rotor cooling device provided by an embodiment of the present application.

[0031] Among them, the above-mentioned drawings include the following reference numerals:

[0032] 1 - rotor shaft, 2 - oil inlet, 3 - inner cavity of the rotor shaft, 4 - first shaft oil hole;

[0033] 5 - rotor core, 6 - permanent magnet group, 7 - weight removal hole;

[0034] 8 - oil guide plate; 9 - first oil guide groove, 10 - first oil hole;

[0035] 11 - first positioning component, 12 - second positioning component, 13 - first positioning hole, 14 - second positioning hole;

[0036] 15 - first balance plate, 16 - first oil passage, 17 - fourth oil hole, 18 - second oil guide groove;

[0037] 19 - second shaft oil hole, 20 - second oil hole, 21 - third oil hole;

[0038] 22 - third positioning component, 23 - third positioning hole;

[0039] 24 - third shaft oil hole;

[0040] 25 - second balance plate, 26 - second oil passage, 27 - fifth oil hole, 28 - third oil guide groove;

[0041] 29 - Fourth positioning component, 30 - Fourth positioning hole, 31 - Boss, 32 - Shoulder, 33 - Keyway;

[0042] 34 - First groove; 35 - Second groove, 36 - Third groove;

[0043] 37 - Oil guide pipe, 38 - Sixth oil hole, 39 - Bowl-shaped plug. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0045] Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] The embodiment of the present application provides a rotor cooling device for designing an oil circuit inside the anti-leakage magnetic flux and weight removal hole 7 of the iron core to achieve sufficient cooling of the permanent magnet.

[0047] Figure 1 is a three-dimensional sectional schematic diagram of the rotor cooling device provided by an embodiment of the present application, Figure 2 is a structural schematic diagram of the rotor iron core 5 of the rotor cooling device provided by an embodiment of the present application, Figure 3 is a planar structural schematic diagram of the oil guide plate 8 of the rotor cooling device provided by an embodiment of the present application, Figure 4 is a three-dimensional structural schematic diagram of the oil guide plate 8 of the rotor cooling device provided by an embodiment of the present application. As Figures 1-4 shown, the rotor cooling device includes: a rotor shaft 1, at least two sections of rotor iron cores 5, and an oil guide plate 8. The first side of the rotor shaft 1 has an oil inlet 2, and the rotor shaft 1 has an inner cavity 3. Cooling oil enters the inner cavity 3 of the rotor shaft through the oil inlet 2; a plurality of first shaft oil holes 4 are circumferentially distributed in the middle of the rotor shaft 1, and the inner cavity 3 of the rotor shaft is used to transmit cooling oil to the plurality of first shaft oil holes 4.

[0048] In one embodiment, the rotor shaft 1 further includes: an oil guide pipe 37, the oil guide pipe 37 is arranged inside the inner cavity 3 of the rotor shaft, and the oil guide pipe 37 has circumferentially distributed sixth oil holes 38. Cooling oil enters the cavity of the oil guide pipe 37 through the oil inlet 2 on one side of the rotor shaft 1 and flows into the inner cavity 3 of the rotor shaft through the sixth oil holes 38.

[0049] In one embodiment, the rotor shaft 1 further includes: a bowl-shaped plug 39, and the bowl-shaped plug 39 is located on the second side of the rotor shaft 1 (for example Figure 1On the right side as shown, it is arranged opposite to the oil inlet 2 and is used to prevent the cooling oil in the inner cavity 3 of the rotor shaft from flowing out.

[0050] The rotor core 5 is sleeved on the outside of the rotor shaft 1. The rotor core 5 includes a plurality of permanent magnet groups 6, and each permanent magnet group 6 has a weight removal hole 7 inside; the oil guide plate 8 is sleeved on the outside of the rotor shaft 1 and is located between two sections of the rotor core 5; the oil guide plate 8 has a plurality of first oil guide grooves 9 and a plurality of first oil holes 10. The first oil guide grooves 9 correspond to the first shaft oil holes 4 radially one by one, the first oil guide grooves 9 are communicated with the first oil holes 10, and the plurality of first oil holes 10 are communicated with the weight removal holes 7 of the plurality of permanent magnet groups 6 one by one. The cooling oil is transmitted into the first oil guide grooves 9 through the plurality of first shaft oil holes 4, is collected into the plurality of first oil holes 10 through the first oil guide grooves 9, and the cooling oil flows into the plurality of weight removal holes 7 of the permanent magnet groups 6 of the rotor core 5 on both sides of the oil guide plate 8 respectively through the plurality of first oil holes 10.

[0051] In the present invention, by arranging a plurality of first shaft oil holes 4 on the cavity of the rotor shaft 1, arranging a plurality of first oil guide grooves 9 on the oil guide plate 8, the plurality of first oil guide grooves 9 are communicated with the plurality of first shaft oil holes 4 one by one, and the plurality of first oil guide grooves 9 are communicated with the plurality of weight removal holes 7 in the plurality of permanent magnet groups 6 on the rotor core 5 on both sides of the oil guide plate 8 one by one, the effect of fully cooling the permanent magnet is achieved while ensuring the original structure of the rotor core 5 remains unchanged and cooling oil is passed through the inside of the permanent magnet group 6.

[0052] In an embodiment, the rotor core 5 further includes: a first positioning component 11, and the oil guide plate 8 further includes a second positioning component 12; the first positioning component 11 and the second positioning component 12 are axially aligned. Among them, the first positioning component 11 can be two first positioning holes 13 that are centrosymmetric with respect to the center of the rotor core 5, and the first positioning holes 13 are arranged Figure 2 inside the weight removal holes 7 as shown; the second positioning component 12 is two second positioning holes 14 that are centrosymmetric with respect to the center of the oil guide plate 8, and the plurality of second positioning holes 14 are arranged Figure 3 inside the partition formed by the plurality of first oil guide grooves 9 as shown; the plurality of first positioning holes 13 and the plurality of second positioning holes 14 correspond to each other one by one, and the two sections of the rotor core 5 and the oil guide plate 8 between the two sections of the rotor core 5 are positioned through the installation and cooperation of the positioning rod and the plurality of first positioning holes 13 and the plurality of second positioning holes 14. The positioning method for determining the relative positions of the rotor core 5 and the oil guide plate 8 is not limited to the design of the positioning holes, and any compatible structural design related to positioning can be used as long as the positioning requirements are met.

[0053] In one embodiment, the first oil guiding groove 9 includes: a plurality of first grooves 34, the plurality of first grooves 34 corresponding to the plurality of first axial oil holes 4 one by one; a second groove 35, the second groove 35 being annular and connecting the plurality of first grooves 34; a plurality of third grooves 36, the third grooves 36 being V-shaped, both ends of the third grooves 36 communicating with the second groove 35, and a plurality of first oil holes 10 being respectively located at the tops of the plurality of third grooves 36.

[0054] Figure 5 is a schematic plan view of the first balance plate 15 of the rotor cooling device provided by an embodiment of the present application, Figure 6 is a schematic three-dimensional view of the first balance plate 15 of the rotor cooling device provided by an embodiment of the present application, as Figure 1 、 5 and Figure 6 shown, the rotor cooling device further includes: a first balance plate 15, the first balance plate 15 being located on one side of at least two sections of rotor cores 5 (for example, Figure 1 shown on the left side); the first balance plate 15 includes a plurality of first oil channels 16, a plurality of fourth oil holes 17, and a plurality of second oil guiding grooves 18. The fourth oil holes 17 and the first oil channels 16 are arranged alternately, the middle of the second oil guiding groove 18 communicates with the fourth oil holes 17, and both ends of the second oil guiding groove 18 respectively communicate with the weight removal holes 7 of two adjacent permanent magnet groups 6 one by one.

[0055] Among them, the rotor shaft 1 further includes a plurality of second axial oil holes 19 circumferentially distributed on the first side of the rotor shaft 1 (for example, Figure 1 shown on the left side); the rotor core 5 further includes a plurality of second oil holes 20, the second oil holes 20 and the weight removal holes 7 are arranged alternately, and the plurality of second oil holes 20 communicate with the plurality of fourth oil holes 17 one by one; the oil guiding plate 8 further includes a plurality of third oil holes 21, the third oil holes 21 and the first oil holes 10 are arranged alternately. The cooling oil enters from the inner cavity 3 of the rotor shaft into the plurality of second axial oil holes 19, the plurality of second axial oil holes 19 communicate with one ends of the plurality of first oil channels 16 radially one by one, the other ends of the plurality of first oil channels 16 communicate with the plurality of second oil holes 20 one by one, and the plurality of third oil holes 21 communicate with the plurality of second oil holes 20 one by one. After the cooling oil flows through the plurality of second axial oil holes 19, the plurality of first oil channels 16, the plurality of second oil holes 20 of one section of the rotor core 5, and the plurality of third oil holes 21 of the oil guiding plate 8, it enters the plurality of second oil holes 20 of another section of the rotor core 5.

[0056] Figure 7 is a schematic diagram of the positioning and installation of the first balance plate 15 and the rotor core 5 of the rotor cooling device provided by an embodiment of the present application, as Figure 7 shown, the first balance plate 15 further includes: a third positioning component 22, the third positioning component 22 being axially aligned with the second positioning component 12 of the oil guiding plate 8 and the first positioning component 11 of the rotor core 5.

[0057] Among them, the third positioning component 22 is two third positioning holes 23 that are centrosymmetric with respect to the center of the first balance plate 15. A plurality of third positioning holes 23 are arranged Figure 5 between the first oil passage 16 and the fourth oil hole 17 shown in the figure, and are located inside the second oil guiding groove 18; in the figure, the connecting lines between the plurality of first positioning holes 13 and the plurality of third positioning holes 23 indicate that the plurality of first positioning holes 13 and the plurality of third positioning holes 23 are in one-to-one correspondence and communication. At the same time, the plurality of first positioning holes 13 and the plurality of third positioning holes 23 are also in one-to-one correspondence and communication with the plurality of second positioning holes 14. The first balance plate 15, the two rotor cores 5, and the oil guiding plate 8 between the two rotor cores 5 are positioned through the installation and cooperation of the positioning rod and the plurality of first positioning holes 13, the plurality of second positioning holes 14, and the plurality of third positioning holes 23. The positioning method for determining the relative positions of the first balance plate 15, the rotor core 5, and the oil guiding plate 8 is not limited to the design of the positioning holes. As long as the positioning requirements are met, any compatible structural design related to positioning can be used.

[0058] Figure 8 is a schematic plan view of the second balance plate 25 of the rotor cooling device provided by an embodiment of the present application. As Figure 1 and 8 shown, the rotor shaft 1 further includes a plurality of third shaft oil holes 24 that are circumferentially distributed on the second side of the rotor shaft 1 (for example, Figure 1 the right side shown in the figure); the rotor cooling device further includes: a second balance plate 25, and the second balance plate 25 is located on the other side of at least two rotor cores 5 (for example, Figure 1 the right side shown in the figure); the second balance plate 25 includes: a plurality of second oil passages 26, a plurality of fifth oil holes 27, and a plurality of third oil guiding grooves 28. One end of each of the plurality of second oil passages 26 is in one-to-one correspondence and communication with the plurality of third shaft oil holes 24 in the radial direction, and the other end of each of the plurality of second oil passages 26 is in one-to-one correspondence and communication with the plurality of second oil holes 20; the cooling oil enters from the inner cavity 3 of the rotor shaft and flows to the plurality of third shaft oil holes 24. The cooling oil flows through the plurality of third shaft oil holes 24, the plurality of second oil passages 26, the plurality of second oil holes 20 of one rotor core 5, and the plurality of third oil holes 21 of the oil guiding plate 8 and then enters the plurality of second oil holes 20 of the other rotor core 5. The fifth oil holes 27 and the second oil passages 26 are arranged alternately, and the plurality of fifth oil holes 27 are in one-to-one correspondence and communication with the plurality of second oil holes 20; the plurality of fifth oil holes 27 are in one-to-one correspondence and communication with the other ends of the plurality of first oil passages ********; after the cooling oil enters the first oil passage 16, it is ejected from the fifth oil hole 27 after passing through the second oil hole 20 corresponding to the first oil passage 16; the other ends of the plurality of second oil passages 26 are in one-to-one correspondence and communication with the plurality of fourth oil holes 17. After the cooling oil enters the second oil passage 26, it is ejected from the fourth oil hole 17 after passing through the second oil hole 20 corresponding to the second oil passage 26; the middle of the third oil guiding groove 28 is in communication with the fifth oil hole 27, and the two ends of the third oil guiding groove 28 are respectively in one-to-one correspondence and communication with the de-weighting holes 7 of two adjacent permanent magnet groups 6.

[0059] In one embodiment, the second balance plate 25 further includes: a fourth positioning component 29, and the fourth positioning component 29 is axially aligned with the second positioning component 12 of the oil guide plate 8, the first positioning component 11 of the rotor core 5, and the third positioning component 22 of the first balance plate 15.

[0060] Among them, the fourth positioning component 29 is two fourth positioning holes 30 that are centrosymmetric with respect to the center of the first balance plate 15, and a plurality of fourth positioning holes 30 are arranged Figure 8 between the second oil passage 26 and the fifth oil hole 27 shown, inside the third oil guide groove 28; a plurality of first positioning holes 13, a plurality of second positioning holes 14, a plurality of third positioning holes 23, and a plurality of fourth positioning holes 30 are in one-to-one correspondence and communication. Through the installation and cooperation of the positioning rod and a plurality of first positioning holes 13, a plurality of second positioning holes 14, a plurality of third positioning holes 23, and a plurality of fourth positioning holes 30, the first balance plate 15, the two rotor cores 5, the oil guide plate 8 between the two rotor cores 5, and the second balance plate 25 are positioned, ensuring that the first balance plate 15 and the second balance plate 25 rotate relatively at 45°, that is, the first oil passage 16 of the first balance plate 15 corresponds axially to the fifth oil hole 27 of the second balance plate 25, and the fourth oil hole 17 of the first balance plate 15 corresponds axially to the second oil passage 26 of the second balance plate 25.

[0061] Furthermore, the positioning method for determining the relative positions of the first balance plate 15, the rotor core 5, the oil guide plate 8, and the second balance plate 25 is not limited to the design of positioning holes. As long as the positioning requirements are met, any compatible structural design related to positioning can be used.

[0062] Figure 9 It is a schematic diagram of the positioning component of the second balance plate 25 of the rotor cooling device provided by an embodiment of the present application. Figure 10 It is a schematic diagram of the installation and positioning of the second balance plate 25 and the rotor shaft 1 of the rotor cooling device provided by an embodiment of the present application. As Figure 9 and Figure 10 shown, the fourth positioning component 29 includes: a boss 31, the boss 31 is located on the second balance plate 25 and is centrosymmetric with respect to the center of the second balance plate 25; the rotor shaft 1 includes a shoulder 32 and a keyway 33 located on the shoulder 32, and is arranged on the second side of the rotor shaft 1; the boss 31 is installed and cooperated with the keyway 33 for positioning the second balance plate 25.

[0063] Furthermore, the shoulder 32 of the rotor shaft 1 does not necessarily have to be arranged on the second side of the rotor shaft 1, and can be specifically analyzed and designed according to the needs of the actual structure.

[0064] Among them, the positioning method for determining the relative positions of the rotor shaft 1 and the second balance plate 25 is not limited to the design of positioning holes. As long as the positioning requirements are met, any compatible structural design related to positioning can be used.

[0065] Figure 11 is a schematic diagram of the oil circuit 1 of the rotor cooling device provided by an embodiment of the present application. As Figure 11 shown, the cooling oil enters the cavity of the oil guide pipe 37 through the oil inlet 2 on one side of the rotor shaft 1, flows into the inner cavity 3 of the rotor shaft through the sixth oil hole 38 on the oil guide pipe 37, enters the plurality of first oil guide grooves 9 of the oil guide plate 8 through the plurality of first shaft oil holes 4 in the inner cavity 3 of the rotor shaft, and converges to the plurality of first oil holes 10. The cooling oil respectively flows into the plurality of weight removal holes 7 of the rotor core 5 on both sides of the oil guide plate 8 through the plurality of first oil holes 10; after the cooling oil enters the plurality of weight removal holes 7 on the first side of the oil guide plate 8, it enters the plurality of second oil guide grooves 18 of the first balance plate 15, converges to the fourth oil hole 17 of the first balance plate 15 through the second oil guide grooves 18, and then is thrown out to cool the inside of the permanent magnet group 6; after the cooling oil enters the plurality of weight removal holes 7 on the second side of the oil guide plate 8, it enters the plurality of third oil guide grooves 28 of the second balance plate 25, converges to the fifth oil hole 27 of the second balance plate 25 through the third oil guide grooves 28, and is then thrown out to the stator winding to cool the permanent magnet group 6 and the stator winding. Among them, the small arrows in the figure indicate the flow direction of the cooling oil.

[0066] Figure 12 is a schematic diagram of the oil circuit 2 of the rotor cooling device provided by an embodiment of the present application. As Figure 12 shown, the cooling oil enters the cavity of the oil guide pipe 37 through the oil inlet 2 on one side of the rotor shaft 1, flows into the inner cavity 3 of the rotor shaft through the sixth oil hole 38 on the oil guide pipe 37, enters the plurality of first oil channels 16 of the first balance plate 15 through the plurality of second shaft oil holes 19 in the inner cavity 3 of the rotor shaft, flows into the plurality of second oil holes 20 of the rotor core 5, then flows into the plurality of second oil holes 20 of the rotor core 5 on the other side of the oil guide plate 8 after passing through the plurality of third oil holes 21 of the oil guide plate 8, and finally is thrown out to the stator winding through the plurality of fifth oil holes 27 of the second balance plate 25 to cool the permanent magnet group 6 and the stator winding. Among them, the small arrows in the figure indicate the flow direction of the cooling oil.

[0067] Figure 13 is a schematic diagram of the oil circuit 3 of the rotor cooling device provided by an embodiment of the present application. As Figure 13As shown in the figure, the cooling oil enters the cavity of the guide oil pipe 37 through the oil inlet 2 on one side of the rotor shaft 1, flows into the inner cavity 3 of the rotor shaft through the sixth oil hole 38 on the guide oil pipe 37, enters the multiple second oil channels 26 of the second balance plate 25 through the multiple third shaft oil holes 24 in the inner cavity 3 of the rotor shaft, flows into the multiple second oil holes 20 of the rotor core 5, flows into the multiple second oil holes 20 of the rotor core 5 on the other side of the guide oil plate 8 after passing through the multiple third oil holes 21 of the guide oil plate 8, and is finally thrown out to the stator winding through the multiple fifth oil holes 27 of the first balance plate 15, realizing the cooling of the permanent magnet group 6 and the stator winding. Among them, the small arrows in the figure indicate the flow direction of the cooling oil.

[0068] The above are the specific embodiments exemplified in this application, and the rotor cooling device proposed in this application is not limited to the structural design in the embodiments. For example, the number of the permanent magnet groups 6 in the rotor core 5 is not necessarily Figure 2 8 as exemplified in the figure shown, and may be 6 or 4, etc. Therefore, the oil circuit needs to be designed according to the actual number of the permanent magnet groups 6 in the rotor core 5. For example, when there are 6 permanent magnet groups 6 in the rotor core 5, in order to make the deweighting holes 7 in the permanent magnet groups 6 correspond one by one, the second oil guide grooves 18 of the first balance plate 15 are 3, and the first oil holes 10 of the guide oil plate 8 are 6. Therefore, specific examples need to be analyzed specifically.

Claims

1. A rotor cooling device, characterized in that, Comprising: A rotor shaft having an inner cavity for transmitting cooling oil; the inner cavity of the rotor shaft has a plurality of first shaft oil holes circumferentially distributed thereon; At least two sections of rotor cores sleeved outside the rotor shaft, each rotor core including a plurality of permanent magnet groups, and each permanent magnet group having a weight removal hole inside; An oil guide plate sleeved outside the rotor shaft and located between the two sections of rotor cores; the oil guide plate has a plurality of first oil guide grooves, and the first oil guide grooves correspond radially one by one to the first shaft oil holes; the oil guide plate further includes a plurality of first oil holes communicating with the first oil guide grooves, and the plurality of first oil holes communicate with the weight removal holes of the plurality of permanent magnet groups one by one, for flowing cooling oil into the insides of the permanent magnet groups on both sides of the oil guide plate.

2. The rotor cooling device according to claim 1, characterized in that, The rotor core further includes: a first positioning component, and the oil guide plate further includes a second positioning component; the first positioning component is axially aligned with the second positioning component.

3. The rotor cooling device according to claim 1, characterized in that, Further comprising: A first balance plate located on one side of the at least two sections of rotor cores; the first balance plate includes a plurality of first oil channels, a plurality of fourth oil holes, and the fourth oil holes and the first oil channels are arranged alternately; a plurality of second oil guide grooves, the middle of the second oil guide grooves communicates with the fourth oil holes, and the two ends of the second oil guide grooves communicate with the weight removal holes of adjacent two permanent magnet groups respectively one by one; The rotor shaft further includes a plurality of second shaft oil holes circumferentially distributed on the rotor shaft; one ends of the plurality of first oil channels communicate with the plurality of second shaft oil holes radially one by one, for passing cooling oil into the first oil channels; The rotor core further includes a plurality of second oil holes arranged alternately with the weight removal holes; the other ends of the plurality of first oil channels communicate with the plurality of second oil holes one by one, and the plurality of fourth oil holes communicate with the plurality of second oil holes one by one; The oil guide plate further includes a plurality of third oil holes arranged alternately with the first oil holes, and the plurality of third oil holes communicate with the plurality of second oil holes one by one.

4. The rotor cooling device according to claim 3, characterized in that, The first balance plate further includes: a third positioning component, and the third positioning component is axially aligned with the second positioning component of the oil guide plate and the first positioning component of the rotor core.

5. The rotor cooling device according to claim 3, characterized in that, The rotor shaft further includes a plurality of third shaft oil holes circumferentially distributed on the rotor shaft; The rotor cooling device further includes: A second balance plate located on the other side of the at least two sections of rotor cores, the second balance plate including: a plurality of second oil channels, one ends of the plurality of second oil channels communicate with the plurality of third shaft oil holes radially one by one, for passing cooling oil into the second oil channels; the other ends of the plurality of second oil channels communicate with the plurality of second oil holes one by one; A plurality of fifth oil holes, the fifth oil holes and the second oil channels are arranged alternately, and the plurality of fifth oil holes communicate with the plurality of second oil holes one by one; the plurality of fifth oil holes communicate with the other ends of the plurality of first oil channels one by one; the other ends of the plurality of second oil channels communicate with the plurality of fourth oil holes one by one; A plurality of third oil guiding grooves, the middle part of the third oil guiding groove is communicated with the fifth oil hole, and the two ends of the third oil guiding groove are respectively and correspondingly communicated with the weight removal holes of two adjacent permanent magnet groups.

6. The rotor cooling device according to claim 5, characterized in that, The second balance plate further includes: a fourth positioning component, and the fourth positioning component is axially aligned with the second positioning component of the oil guiding plate, the first positioning component of the rotor core, and the third positioning component of the first balance plate.

7. The rotor cooling device according to claim 6, characterized in that, The rotor shaft includes a shoulder and a keyway located on the shoulder; The fourth positioning component includes: a boss, the boss is located on the second balance plate, and the boss is installed and matched with the keyway for fixing the second balance plate.

8. The rotor cooling device according to claim 1, characterized in that, The first oil guiding groove includes: A plurality of first grooves, and the plurality of first grooves correspond to the plurality of first axial oil holes one by one; A second groove, the second groove is annular and connects the plurality of first grooves; A plurality of third grooves, the third grooves are V-shaped, the two ends of the third grooves are communicated with the second groove, and the plurality of first oil holes are respectively located at the tops of the plurality of third grooves.

9. The rotor cooling device according to claim 1, wherein The rotor shaft further includes: An oil guiding pipe, the oil guiding pipe is arranged inside the inner cavity of the rotor shaft, and the oil guiding pipe has circumferentially distributed sixth oil holes for flowing the cooling oil in the oil guiding pipe into the inner cavity of the rotor shaft.

10. The rotor cooling device according to claim 1, characterized in that, The rotor shaft further includes: A bowl-shaped plug, the bowl-shaped plug is located at one end opposite to the oil inlet of the rotor shaft for preventing the cooling oil in the inner cavity of the rotor shaft from flowing out.

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