Rotor cooling structure

Abstract

The utility model provides a rotor cooling structure which comprises a rotating shaft (1), a rotor support (2) is fixedly sleeved on the periphery of the rotating shaft (1), balance plates (3) are fixedly arranged on two sides of the rotor support (2), and a rotor iron core assembly (4) is fixedly accommodated on the periphery of the rotor support (2) and located between the balance plates (3) on the two sides. A part of cooling oil in an oil cavity in the rotating shaft (1) is thrown into a bearing chamber through a bearing oil throwing hole (11), a part of the cooling oil is thrown into a rotor iron core assembly (4) through a rotating shaft oil throwing hole (12), and then the cooling oil is thrown to the inner contour of a stator winding through an oil passing groove (31) in the balance plate (3), and is characterized in that the oil passing groove (31) extends to the radial outer edge of the balance plate (3); therefore, the cooling oil can be thrown out to the end part of the rotor iron core assembly, so that the overall cooling effect of the rotor iron core assembly is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-cooled motor cooling technology, and specifically relates to a rotor cooling structure. Background Art

[0002] The heat dissipation targets of oil-cooled motors are mainly the stator assembly and the rotor assembly. As the motor speed increases, the loss of the rotor assembly increases accordingly. At present, the cooling method of the rotor assembly is to pass oil through the inner cavity of the rotor shaft, and the oil is thrown through the oil-throwing holes of the bearing to cool the bearing chamber. The cooling oil in the oil cavity inside the shaft is thrown into the internal through-holes of the rotor core assembly through the rotating shaft to cool the rotor core assembly.

[0003] The structure adopted by this cooling method is: Figure 1 As shown in FIG. 1 , a balancing plate with a blade guide structure is provided on both sides of the rotor, and a hole is opened on the inlet side of the rotor shaft cavity. This structure will cause uneven distribution of oil in the rotor channel, and most of the oil will be thrown out from the oil throwing hole of the bearing on one side, such as Figure 2-3 As shown; at the same time, the blade guide ventilation structure of the balance plates on both sides of the rotor cannot take away the oil inside the rotor channel, and the airflow has reflux inside the rotor, such as Figure 4 As shown, this results in low heat dissipation efficiency of the rotor; in addition, the balance plate structure on both sides of the rotor increases the risk of oil entering the air gap. Utility Model Content

[0004] In order to solve the defects and shortcomings in the prior art, the utility model provides a rotor cooling structure.

[0005] The technical solution provided by the utility model is as follows:

[0006] A rotor cooling structure comprises a rotating shaft, wherein a rotor support is fixedly sleeved on the outer periphery of the rotating shaft, balance plates are fixedly arranged on both sides of the rotor support, and a rotor core assembly is fixedly accommodated on the outer periphery of the rotor support and between the balance plates on both sides. Part of the cooling oil in the internal oil cavity of the rotating shaft is thrown into the bearing chamber through the bearing oil-flinging hole, and part of the cooling oil is thrown into the rotor core assembly through the rotating shaft oil-flinging hole, and then thrown to the inner contour of the stator winding through the oil groove inside the balance plate. The structure is characterized in that: the oil groove extends to the radial outer edge of the balance plate.

[0007] As a further preferred embodiment of the present utility model, a plurality of oil passage grooves are evenly arranged at equal intervals on the outer circumference of the rotating shaft.

[0008] As a further preferred embodiment of the present utility model, the oil passage groove is arranged in a streamlined shape corresponding to the rotation direction of the rotating shaft.

[0009] As a further preferred embodiment of the present invention, the outer edge of the balance plate is configured as a rounded structure.

[0010] As a further preferred embodiment of the present invention, the outer edge of the balance plate is configured as a chamfered structure.

[0011] As a further preferred embodiment of the present invention, the outer edge of the balance plate is configured as a rounded or chamfered structure, and bosses are spaced inside the outer edge.

[0012] As a further preferred embodiment of the present invention, the outer edge of the balancing plate is configured as a rounded or chamfered structure, and blades are arranged at intervals inside the outer edge.

[0013] As a further preferred embodiment of the utility model, the shaft oil-slinging holes are provided in multiple groups along the axial direction of the shaft.

[0014] As a further preferred embodiment of the utility model, the shaft oil-slinging holes arranged adjacent to each other in the axial direction are distributed at intervals in the circumferential direction of the shaft.

[0015] As a further preferred embodiment of the utility model, grooves are provided at the entrances of the bearing oil-swinging hole and the shaft oil-swinging hole, and the diameter of the grooves is larger than the diameter of the oil-swinging hole.

[0016] Compared with the prior art, the beneficial effects achieved by the utility model include:

[0017] 1) The utility model provides a rotor cooling structure, by arranging the oil groove to extend to the radial outer edge of the balance plate, so that the cooling oil can be thrown out to the end of the rotor core assembly, thereby enhancing the overall cooling effect of the rotor core assembly.

[0018] 2) The utility model provides a rotor cooling structure, which can effectively reduce the amount of oil entering the air gap and effectively reduce the risk of oil entering the air gap by setting the outer edge of the balance plate to a rounded or chamfered structure.

[0019] 3) The utility model provides a rotor cooling structure, which provides a plurality of groups of shaft oil-slinging holes along the axial direction of the shaft, and the shaft oil-slinging holes arranged adjacent to each other in the axial direction are distributed at intervals on the circumference of the shaft, so that cooling oil can enter each axial position and circumferential position of the rotor, thereby increasing the contact area between the inside of the rotor and the cooling oil, increasing the oil flow rate, thereby increasing the surface heat transfer coefficient between the oil and the rotor, and improving the cooling effect.

[0020] 4) The utility model provides a rotor cooling structure, which further increases the amount of cooling oil entering and improves the cooling effect by opening grooves at the entrances of the bearing oil-slinging holes and the shaft oil-slinging holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a balance board in the prior art.

[0022] Figure 2 It is an axial cross-sectional view of a rotor cooling structure in the prior art.

[0023] Figure 3 It is a radial cross-sectional view of a rotor cooling structure in the prior art.

[0024] Figure 4 It is a schematic diagram of the airflow inside the rotor in the prior art.

[0025] Figure 5 This is a schematic diagram of the rotor cooling structure provided by the utility model.

[0026] Figure 6 This is a structural schematic diagram of the balance board provided by the utility model.

[0027] Figure 7 This is an enlarged structural diagram of the radial outer edge of the balance plate provided by the utility model.

[0028] Figure 8 This is a structural schematic diagram of a balance plate provided by the utility model having an outer edge arranged as a rounded structure.

[0029] Fig. 9 This is a structural side view of a balance board provided by the utility model having an outer edge arranged as a rounded structure.

[0030] Fig.10 This is a structural schematic diagram of a balance plate provided by the utility model with an outer edge arranged as a chamfered structure.

[0031] Fig.11 This is a structural schematic diagram of a balance plate provided by the utility model having an outer edge that is configured as a chamfered structure combined with a boss structure.

[0032] Fig.12 This is a structural schematic diagram of a balance plate outer edge provided by the utility model being configured as a chamfered structure combined with a blade structure. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] [First embodiment]

[0037] like Figure 5-12 The figure shows a rotor cooling structure provided by the first embodiment of the utility model, comprising a rotating shaft 1, a rotor support 2 is fixedly sleeved on the outer periphery of the rotating shaft 1, a balancing plate 3 is fixedly arranged on both sides of the rotor support 2, a rotor core assembly 4 is fixedly accommodated on the outer periphery of the rotor support 2 and between the balancing plates 3 on both sides, and the cooling oil in the internal oil cavity of the rotating shaft 1 is partially thrown into the bearing chamber through the bearing oil throwing hole 11, and partially thrown into the rotor core assembly 4 through the rotating shaft oil throwing hole 12, and then thrown to the inner contour of the stator winding through the oil groove 31 inside the balancing plate 3, as shown in FIG. Figure 5 As shown, in this embodiment, a plurality of groups of shaft oil-slinging holes 12 are arranged along the axial direction of the shaft 1, and the shaft oil-slinging holes 12 arranged adjacent to each other in the axial direction are distributed at intervals in the circumferential direction of the shaft 1, so that cooling oil can enter each axial position and circumferential position of the rotor, thereby increasing the contact area between the inside of the rotor and the cooling oil, increasing the oil flow rate, thereby increasing the surface heat transfer coefficient between the oil and the rotor, and improving the cooling effect.

[0038] As a further preference, grooves are provided at the entrances of the bearing oil-flinging hole 11 and the shaft oil-flinging hole 12 in this embodiment, and the aperture of the groove is larger than the aperture of the oil-flinging hole. By providing grooves at the entrances of the bearing oil-flinging hole and the shaft oil-flinging hole, the amount of cooling oil entering is further increased to improve the cooling effect.

[0039] Another improvement of this embodiment over the prior art is that: Figure 6-7As shown, the oil groove 31 extends to the radial outer edge of the balance plate 3. By setting the oil groove to extend to the radial outer edge of the balance plate, the cooling oil can be thrown out to the end of the rotor core assembly, thereby enhancing the overall cooling effect of the rotor core assembly.

[0040] Preferably, a plurality of oil passage grooves 31 are evenly spaced around the outer circumference of the shaft 1, and the oil passage grooves 31 are streamlined to correspond to the rotation direction of the shaft 1, so as to match the oil throwing process to further enhance the cooling effect.

[0041] In addition, if Figure 8-9 As shown, in this embodiment, the outer edge 32 of the balance board is set to a rounded structure, which can also be Fig.10 As shown, the outer edge 32 of the balance plate is set to a chamfered structure. By setting the outer edge of the balance plate to a rounded or chamfered structure, the amount of oil entering the air gap can be effectively reduced, and the risk of oil entering the air gap can be effectively reduced.

[0042] As a further preference of this embodiment, in order to further increase the strength of the outer edge 32 of the balance board, it is also possible to Fig.11 As shown, the outer edge 32 of the balance plate is set to a rounded or chamfered structure, and bosses are arranged at intervals inside the outer edge 32; or as shown in FIG. Fig.12 As shown, the outer edge 32 of the balancing plate is configured as a rounded or chamfered structure, and blades are arranged at intervals inside the outer edge 32 .

[0043] The utility model provides a rotor cooling structure, which, by setting the oil passage groove to extend to the radial outer edge of the balance plate, allows the cooling oil to be thrown out to the end of the rotor core assembly, thereby enhancing the overall cooling effect of the rotor core assembly; by setting the outer edge of the balance plate to a rounded or chamfered structure, the amount of oil entering the air gap can be effectively reduced, and the risk of oil entering the air gap can be effectively reduced; by providing multiple groups of shaft oil-throwing holes along the axial direction of the shaft, and the shaft oil-throwing holes adjacent to each other in the axial direction are distributed at intervals in the circumferential direction of the shaft, cooling oil can enter each axial position and circumferential position of the rotor, thereby increasing the contact area between the inside of the rotor and the cooling oil, increasing the oil flow rate, thereby increasing the surface heat transfer coefficient between the oil and the rotor, and improving the cooling effect; by providing grooves at the entrances of the bearing oil-throwing holes and the shaft oil-throwing holes, the amount of cooling oil entering is further increased to improve the cooling effect.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A rotor cooling structure, comprising a rotating shaft (1), a rotor support (2) being fixedly sleeved on the outer periphery of the rotating shaft (1), balancing plates (3) being fixedly arranged on both sides of the rotor support (2), a rotor core assembly (4) being fixedly accommodated on the outer periphery of the rotor support (2) and between the balancing plates (3) on both sides, the cooling oil in the internal oil cavity of the rotating shaft (1) being partially thrown into the bearing chamber through the bearing oil throwing hole (11), and partially thrown into the rotor core assembly (4) through the rotating shaft oil throwing hole (12), and then thrown to the inner contour of the stator winding through the internal oil groove (31) of the balancing plate (3), characterized in that: The oil passage groove (31) extends to the radial outer edge of the balance plate (3).

2. A rotor cooling structure according to claim 1, characterized in that: A plurality of oil passage grooves (31) are evenly spaced on the outer circumference of the rotating shaft (1).

3. A rotor cooling structure according to claim 1, characterized in that: The oil passage groove (31) is arranged in a streamlined shape corresponding to the rotation direction of the rotating shaft (1).

4. A rotor cooling structure according to claim 1, characterized in that: The outer edge (32) of the balancing plate is configured as a rounded structure.

5. A rotor cooling structure according to claim 1, characterized in that: The outer edge (32) of the balancing plate is configured as a chamfered structure.

6. A rotor cooling structure according to claim 1, characterized in that: The outer edge (32) of the balance plate is arranged as a rounded or chamfered structure, and bosses are arranged at intervals inside the outer edge (32).

7. A rotor cooling structure according to claim 1, characterized in that: The outer edge (32) of the balancing plate is arranged as a rounded or chamfered structure, and blades are arranged at intervals inside the outer edge (32).

8. A rotor cooling structure according to claim 1, characterized in that: The rotating shaft oil-slinging holes (12) are arranged in a plurality of groups along the axial direction of the rotating shaft (1).

9. A rotor cooling structure according to claim 8, characterized in that: The shaft oil-slinging holes (12) arranged adjacent to each other in the axial direction are distributed at intervals in the circumferential direction of the shaft (1).

10. A rotor cooling structure according to claim 1, characterized in that: A groove is provided at the entrance of the bearing oil-slinging hole and the shaft oil-slinging hole, and the aperture of the groove is larger than the aperture of the oil-slinging hole.

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