Stator end oil injection heat dissipation structure of oil-cooled motor

Abstract

The invention, which belongs to the field of the oil-cooled motor stator, discloses an oil-injection heat dissipation structure for an end part of an oil-cooled motor stator, comprising two end punching sheets and a central punching sheet. When the cooling oil flows in the cooling loop to be in contact with the punching sheets at the two ends, the cooling oil sequentially passes through the punching sheets at the two ends in the sequence of the first spraying hole, the secondary spraying hole and the tail spraying hole, and the first spraying hole, the secondary spraying hole and the tail spraying hole located in the axial direction are in a horn shape, so that the spraying range is wider when the cooling oil is sprayed out; as the distance between the primary spraying hole and the center of the iron core is larger than the distance between the tail spraying hole and the center of the iron core, cooling oil can be obliquely and inwards sprayed to a stator end winding to cool the winding, and compared with the prior art, the oil spraying hole formed by the primary spraying hole, the secondary spraying hole and the tail spraying hole in the punching sheets at the two ends is in an obliquely and inwards horn shape; when the cooling oil is obliquely and inwards sprayed to the stator end winding, the spraying direction is wider, and the cooling effect on the stator end is improved.

Description

Technical Field

[0001] The invention relates to the field of oil-cooled motor stators, in particular to an oil-spraying heat dissipation structure at the end of an oil-cooled motor stator. Background Art

[0002] With the continuous development of new energy vehicles and the gradual increase in market demand for new energy vehicle driving capabilities, the motors of new energy vehicles need to continuously improve their speed, torque density and power density while gradually compressing their volume. The higher the speed, torque density and power density of the motor, the higher the heat it generates. Therefore, the heat dissipation and cooling structure of the motor are essential for the reliable, stable and efficient operation of the motor. At present, the cooling methods of motors are divided into air cooling, water cooling and oil cooling. The oil cooling method has become the first choice for high-performance motor cooling due to its natural electrical insulation, high degree of freedom in structural design and excellent cooling effect.

[0003] In the prior art 1, patent publication number CN113612322B discloses an oil-cooled motor heat dissipation structure and a motor, including: an oil spray component, the oil spray component is arranged at both ends of the stator core, the outer diameter of the oil spray component is not less than the outer diameter of the stator core, and the oil spray component is in contact with the casing, so that the outer surface of the stator core, the casing and the oil spray component construct a cooling medium circulation cavity, so that the cooling medium flows along the outer surface of the stator core in the cooling medium circulation cavity; the oil spray component is provided with an oil spray channel, one end of the oil spray channel is connected to the cooling medium circulation cavity, and the other end is connected to the internal cavity of the motor, and the oil spray channel is inclined from the end surface of the oil spray component to the direction of the stator end winding, so that the cooling medium is sprayed from the cooling medium circulation cavity along the oil spray channel to the stator end winding. The beneficial effect of the present invention is that the heat dissipation of the stator core and the heat dissipation of the end winding adopt a series cooling oil circuit design, which reduces the oil spraying components, and each part uses the cooling medium with the maximum flow rate to dissipate its heat, and the utilization rate of the cooling medium is greater.

[0004] In the prior art 2, patent publication number CN219999120U discloses a heat exchange structure, a stator core and a motor; the stator heat exchange is improved by setting a second channel group in the stator core winding gap, and then the heat exchange area is further increased by adding a first channel group: in addition, in combination with the structural parameters of the motor, the axial sub-channels are set to a specific number: not only the heat exchange process inside the stator is balanced, but also the mechanical strength and process feasibility of the stator are ensured; wherein the number of stages and the number of teeth of the motor are used to customize the number of axial channels; through cooperation with the end cover component, combined with the preset guide holes on the end cover component, the heat exchange medium from the stator core is further directed to other components that need to be temperature-controlled, thereby realizing temperature regulation of the entire motor system.

[0005] Most of the traditional technical solutions use the cooling solution of radial oil injection at the end adopted in the prior art 1, and a small part adopts the axial cooling solution of directly spraying to the winding as in the prior art 2. Both prior arts have a small spray range and a weak cooling effect. Summary of the invention

[0006] The purpose of the present invention is to solve the problem raised in the background technology, and designs an oil-spraying heat dissipation structure at the stator end of an oil-cooled motor.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is an oil-spraying heat dissipation structure at the end of an oil-cooled motor stator, comprising two end punches and a center punch. The two end punches are welded in sequence along the axial position, and the center punches are welded in sequence along the axial position. The center punches at both ends are each welded in sequence with a two end punch along the axial position, and the two end punches have the same axial position as the center punch when welded.

[0008] The punching sheets at both ends include two end bodies, a first spray hole, a secondary spray hole, and a tail spray hole. The two end bodies are provided with a first spray hole, which is composed of one hole, and there are eight groups of the first spray holes, which are equidistantly opened on the two end bodies. The two end bodies are provided with a secondary spray hole, which is composed of two holes, and there are eight groups of the secondary spray holes, which are equidistantly opened on the two end bodies. The two end bodies are provided with a tail spray hole, which is composed of three holes, and there are eight groups of the tail spray holes, which are equidistantly opened on the two end bodies. The distances of the first spray hole, the secondary spray hole, and the tail spray hole from the center of the two end bodies decrease in the order of the first spray hole, the secondary spray hole, and the tail spray hole.

[0009] The central punching sheet comprises a central body, a convex block and a cooling circuit. The central body is provided with convex blocks, which are fixedly connected to the central body. A plurality of convex blocks form a cooling circuit on the outer surface of the central body.

[0010] In some embodiments of the present invention, the first spray hole is composed of a square hole, the secondary spray hole is composed of two square holes, and the tail spray hole is composed of three square holes. The distances between the first spray hole, the secondary spray hole and the tail spray hole and the center of the two end bodies gradually decrease. After the punching sheets at both ends are rotated and overlapped and welded, the first spray hole, the secondary spray hole and the tail spray hole are overlapped in sequence to form an oil spray hole.

[0011] In some embodiments of the present invention, the first spray hole is composed of a rectangular hole, and the long side of the first spray hole is facing the circumferential direction of the two end bodies. The secondary spray hole is composed of two rectangular holes, and the long side of the secondary spray hole is facing the radial direction of the two end bodies. The tail spray hole is composed of a square hole and two rectangular holes, and the long side of the tail spray hole is facing the circumferential direction of the two end bodies. The distances between the first spray hole, the secondary spray hole and the tail spray hole and the center of the two end bodies gradually decrease. After the rotation and lamination welding of the punching sheets at both ends, the first spray hole, the secondary spray hole and the tail spray hole are overlapped in sequence to form an oil spray hole.

[0012] In some embodiments of the present invention, the first spray hole is composed of a rectangular hole, the long side of the first spray hole is facing the circumferential direction of the two end bodies, the secondary spray hole is composed of two right-angled trapezoidal holes, the two right-angled trapezoidal holes of the secondary spray hole are symmetrical to each other, the tail spray hole is composed of three square holes, the hole spacing between the three square holes of the tail spray hole is larger than the hole spacing between the two right-angled trapezoidal holes of the secondary spray hole, the distances between the first spray hole, the secondary spray hole and the tail spray hole from the center of the two end bodies gradually decrease, and after the two end punching sheets are rotated and stacked and welded, the first spray hole, the secondary spray hole and the tail spray hole are overlapped in sequence to form an oil spray hole.

[0013] In some embodiments of the present invention, welding reserved grooves are provided on the two end punches and the center punch, and the welding reserved grooves are opened on the outer surfaces of the two end punches and the center punch, the positions of the welding reserved grooves between the two end punches are aligned with each other, the positions of the welding reserved grooves between the middle punches are aligned with each other, and the welding reserved seams on the middle punches and the two end punches on both sides are aligned with each other.

[0014] In some embodiments of the present invention, the cooling oil may be sprayed out from the holes along the direction of the first spray hole, the secondary spray hole and the tail spray hole.

[0015] In some embodiments of the present invention, the outermost diameters of the punches at both ends are consistent with the outer diameter of the outer surface of the center punch.

[0016] In some embodiments of the present invention, the two end punches and the center punch are installed in the core housing by interference fit.

[0017] Beneficial effects:

[0018] The present invention provides an oil-spraying heat dissipation structure for the stator end of an oil-cooled motor, which has the following beneficial effects. The device is designed to weld the two end punches in sequence along the axial position during production, and the center punches are welded in sequence along the axial position. The center punches at both ends are welded in sequence along the axial position with one of the two end punches. After welding, when the device is installed in the core shell, the core shell is heated, and then the device is placed in the core shell at room temperature. When the shell temperature cools down, it shrinks and has an interference fit with the outer diameter of the two end punches, thereby sealing the oil circuit, eliminating sealing parts such as oil rings, and reducing costs.

[0019] At the same time, the protrusions on the center punching sheet are interference-fitted with the core shell, and a cooling circuit is formed between the protrusions. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed cooling circuit and contacts the core for cooling. When the cooling oil flows in the cooling circuit and contacts the punching sheets at both ends, it passes through the punching sheets at both ends in the order of the first spray hole, the secondary spray hole and the tail spray hole (the other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole and the tail spray hole do not overlap). The first spray hole, the secondary spray hole and the tail spray hole located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed out. Since the distance between the first spray hole and the center of the core is greater than the distance between the tail spray hole and the center of the core, the cooling oil can be tilted inward and sprayed to the stator end winding to cool the winding;

[0020] Compared with the prior art, the present invention forms a sealed oil circuit wall by an interference fit between the punching sheets at both ends and the shell, eliminates sealing parts such as oil rings, and reduces costs. At the same time, the oil spray holes formed by the first spray hole, the secondary spray hole and the tail spray hole on the punching sheets at both ends are in a trumpet shape inclined inward. When the cooling oil is sprayed inwardly to the stator end winding, the spray direction is wider, thereby improving the cooling effect on the stator end. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the first embodiment of the present invention;

[0022] Figure 2 is a front structural schematic diagram of the first embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a top view of the structure of the first embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of axial injection of the first spray hole, the secondary spray hole and the tail spray hole after rotational lamination in the first embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a radial spray diagram of a first spray hole, a secondary spray hole and a tail spray hole after rotational lamination in the first embodiment of the present invention;

[0026] Figure 6 is a schematic structural diagram of the second embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of the top view of the structure of the second embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the axial injection of the first spray hole, the secondary spray hole and the tail spray hole after rotational lamination in the second embodiment of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the radial spraying schematic diagram of the first spray hole, the secondary spray hole and the tail spray hole after rotational lamination in the second embodiment of the present invention;

[0030] Fig.10 is a schematic diagram of the structure of the third embodiment of the present invention;

[0031] Fig.11 is a schematic diagram of a top view of the structure of the third embodiment of the present invention;

[0032] Fig.12 Schematic diagram of axial injection of the first spray hole, the second spray hole and the tail spray hole after rotational lamination in the third embodiment of the present invention;

[0033] Fig.13 It is a structural schematic diagram of the radial injection schematic diagram of the first nozzle hole, the secondary nozzle hole and the tail nozzle hole after rotational lamination in the third embodiment of the present invention.

[0034] In the figure, 1, punching sheets at both ends; 2, center punching sheet; 3, welding reserved groove; 11, two end bodies; 12, first spray hole; 13, secondary spray hole; 14, tail spray hole; 21, center body; 22, bump; 23, cooling circuit. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "upper / lower end", "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 operated in a specific orientation, and therefore cannot be understood as limiting 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.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1:

[0039] See also Figure 1-5 The present invention provides a technical solution: an oil-spraying heat dissipation structure for the stator end of an oil-cooled motor, comprising two end punching sheets 1 and a center punching sheet 2. The two end punching sheets 1 are welded in sequence along the axial position, and the center punching sheets 2 are welded in sequence along the axial position. The center punching sheets 2 at both ends are each welded in sequence with one of the two end punching sheets 1 along the axial position, and the axial positions of the two end punching sheets 1 and the center punching sheets 2 when being welded are the same.

[0040] The punching sheet 1 at both ends includes two end bodies 11, a first spray hole 12, a secondary spray hole 13, and a tail spray hole 14. The first spray hole 12 is opened on the two end bodies 11, and the first spray hole 12 is composed of one hole. There are eight groups of the first spray holes 12 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with secondary spray holes 13, and the secondary spray holes 13 are composed of two holes. There are eight groups of the secondary spray holes 13 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with tail spray holes 14, and the tail spray holes 14 are composed of three holes. There are eight groups of the tail spray holes 14 and they are opened on the two end bodies 11 at equal distances. The distances of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14 from the center of the two end bodies 11 are reduced in the order of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14.

[0041] The center punch 2 includes a center body 21, a protrusion 22, and a cooling circuit 23. The protrusions 22 are distributed on the center body 21, and the protrusions 22 are fixedly connected to the center body 21. A plurality of protrusions 22 form a cooling circuit 23 on the outer surface of the center body 21.

[0042] In the first embodiment of the present invention, the first spray hole 12 is composed of a square hole, the secondary spray hole 13 is composed of two square holes, and the tail spray hole 14 is composed of three square holes. The distances between the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 and the center of the two end bodies 11 gradually decrease. After the two end punching sheets 1 are rotated and stacked and welded, the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 overlap in sequence to form an oil spray hole. When the cooling oil contacts the two end bodies 11, it passes through the two end punching sheets 1 in sequence along the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 (other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap). The first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed. Since the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be tilted inwardly sprayed to the stator end winding to cool the winding.

[0043] In embodiment 1 of the present invention, welding reserved grooves 3 are provided on the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 are opened on the outer surfaces of the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 between the two end punching sheets 1 are aligned with each other, and the welding reserved grooves 3 between the middle punching sheets are aligned with each other. The middle punching sheets on both sides are aligned with the welding reserved seams on the two end punching sheets 1. Space is left for welding through the welding grooves 5 on the two end punching sheets 1 and the center punching sheet 2, which is convenient for construction personnel to operate.

[0044] In the first embodiment of the present invention, the cooling oil can be sprayed out from the holes along the direction of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14. Other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap.

[0045] In the first embodiment of the present invention, the outermost diameter of the two end punches 1 is consistent with the outer diameter of the outer surface of the center punch 2, and the two end punches 1 and the center punch 2 with the same outer surface diameter cooperate with the core shell to form a cooling circuit 23.

[0046] In the first embodiment of the present invention, the two end punches 1 and the center punch 2 are installed in the core housing with interference fit. The oil circuit is sealed by the interference fit between the two end punches 1 and the center punch 2 and the core housing, and sealing parts such as oil rings are eliminated, thereby reducing costs.

[0047] In the implementation scheme of Example 1 of the present invention:

[0048] During the manufacturing process, the punching sheets 1 at both ends are welded in sequence along the axial position, the center punching sheets 2 are welded in sequence along the axial position, and the center punching sheets 2 at both ends are welded in sequence along the axial position with one punching sheet 1 at both ends. After the welding is completed, the core shell is installed in the core shell, and the core shell is heated. Then, the present invention is kept at room temperature and placed in the core shell. When the shell temperature cools down, it shrinks and interferes with the outer diameter of the punching sheets 1 at both ends to seal the oil circuit, eliminate sealing parts such as oil rings, and reduce costs. At the same time, the protrusions 22 on the center body 21 are interference fitted with the core shell, and a cooling circuit 23 is formed between the protrusions 22. When the cooling oil enters from the oil inlet hole of the shell, it is formed along the oil inlet hole. The cooling circuit 23 flows in all directions and contacts the iron core for cooling. When the cooling oil flows in the cooling circuit 23 and contacts the two end bodies 11, it passes through the punching sheets 1 at both ends in the order of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 (the other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap). The first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed out. Since the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be sprayed inward at an angle to the stator end winding to cool the winding.

[0049] Embodiment 2:

[0050] See also Figure 6-9 The present invention provides a technical solution: an oil-spraying heat dissipation structure at the end of an oil-cooled motor stator, comprising two end punching sheets 1 and a center punching sheet 2. The two end punching sheets 1 are welded in sequence along the axial position, and the center punching sheets 2 are welded in sequence along the axial position. The center punching sheets 2 at both ends are each welded in sequence with one of the two end punching sheets 1 along the axial position, and the axial positions of the two end punching sheets 1 and the center punching sheets 2 when being welded are the same.

[0051] The punching sheet 1 at both ends includes two end bodies 11, a first spray hole 12, a secondary spray hole 13, and a tail spray hole 14. The first spray hole 12 is opened on the two end bodies 11, and the first spray hole 12 is composed of one hole. There are eight groups of the first spray holes 12 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with secondary spray holes 13, and the secondary spray holes 13 are composed of two holes. There are eight groups of the secondary spray holes 13 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with tail spray holes 14, and the tail spray holes 14 are composed of three holes. There are eight groups of the tail spray holes 14 and they are opened on the two end bodies 11 at equal distances. The distances of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14 from the center of the two end bodies 11 are reduced in the order of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14.

[0052] The center punch 2 includes a center body 21, a protrusion 22, and a cooling circuit 23. The protrusions 22 are distributed on the center body 21, and the protrusions 22 are fixedly connected to the center body 21. A plurality of protrusions 22 form a cooling circuit 23 on the outer surface of the center body 21.

[0053] In the second embodiment of the present invention, the first spray hole 12 is composed of a rectangular hole, and the long side of the first spray hole 12 faces the circumferential direction of the two end bodies 11, the secondary spray hole 13 is composed of two rectangular holes, and the long side of the secondary spray hole 13 faces the radial direction of the two end bodies 11, and the tail spray hole 14 is composed of a square hole and two rectangular holes. The long side of the tail spray hole 14 faces the circumferential direction of the two end bodies 11. The distances between the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 and the center of the two end bodies 11 gradually decrease. After the two end punching sheets 1 are rotated and stacked and welded, the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 are overlapped in sequence to form an oil spray hole. When the cooling oil contacts the two end bodies 11, the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 are arranged in the order of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14. The first spray hole 12 and the tail spray hole 14 are arranged in the wrong order, which will prevent the cooling oil from flowing out. The circumferential distance between the first spray hole 12 and the tail spray hole 14 is longer than that in the first embodiment, so that the overlapping area and the spraying area are larger. The radial distance of the secondary spray hole 13 is longer than that in the first embodiment, ensuring that the cooling oil can be accurately sprayed from the tail spray hole 14 to the winding. The first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed. Since the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be tilted inward (the spray inclination angle is larger than that in the first embodiment) and sprayed to the stator end winding to cool the winding.

[0054] In the second embodiment of the present invention, welding reserved grooves 3 are provided on the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 are opened on the outer surfaces of the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 between the two end punching sheets 1 are aligned with each other, and the welding reserved grooves 3 between the middle punching sheets are aligned with each other. The middle punching sheets on both sides are aligned with the welding reserved seams on the two end punching sheets 1. Space is left for welding through the welding grooves 5 on the two end punching sheets 1 and the center punching sheet 2, which is convenient for construction personnel to operate.

[0055] In the second embodiment of the present invention, the cooling oil can be sprayed out from the holes along the direction of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14. Other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap.

[0056] In the second embodiment of the present invention, the outermost diameter of the two end punches 1 is consistent with the outer diameter of the outer surface of the center punch 2, and the two end punches 1 and the center punch 2 with the same outer surface diameter cooperate with the core shell to form a cooling circuit 23.

[0057] In the second embodiment of the present invention, the two end punches 1 and the center punch 2 are installed in the core housing with interference fit. The oil circuit is sealed by the interference fit between the two end punches 1 and the center punch 2 and the core housing, and sealing parts such as oil rings are eliminated, thereby reducing costs.

[0058] In the implementation scheme of Example 2 of the present invention:

[0059] During production, the punching sheets 1 at both ends are welded in sequence along the axial position, the center punching sheets 2 are welded in sequence along the axial position, and the center punching sheets 2 at both ends are welded in sequence with one punching sheet 1 at both ends along the axial position. After welding is completed and it is installed in the core shell, the core shell is heated, and then the present invention is kept at room temperature and placed in the core shell. When the shell temperature cools down, it shrinks and interferes with the outer diameter of the punching sheets 1 at both ends to seal the oil circuit, eliminate sealing parts such as oil rings, and reduce costs. At the same time, the protrusions 22 on the center body 21 are interference fitted with the core shell, and a cooling circuit 23 is formed between the protrusions 22. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed cooling circuit 23 and contacts with the core for cooling. When the cooling oil flows in the cooling circuit 23 to contact with the two end bodies 11 , along the order of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14, they pass through the punching sheets 1 at both ends in sequence (other holes with incorrect arrangement order will prevent cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap), the circumferential distance between the first spray hole 12 and the tail spray hole 14 is longer than that in the first embodiment, so that the overlapping area and the spraying area are larger, and the radial distance of the secondary spray hole 13 is longer than that in the first embodiment, ensuring that the cooling oil can be accurately sprayed from the tail spray hole 14 to the winding, and the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed out. Since the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be tilted inward (the spray tilt angle is larger than that in the first embodiment) and sprayed to the stator end winding to cool the winding.

[0060] Embodiment three:

[0061] See also Figure 10-13 The present invention provides a technical solution: an oil-spraying heat dissipation structure at the end of an oil-cooled motor stator, comprising two end punching sheets 1 and a center punching sheet 2. The two end punching sheets 1 are welded in sequence along the axial position, and the center punching sheets 2 are welded in sequence along the axial position. The center punching sheets 2 at both ends are each welded in sequence with one of the two end punching sheets 1 along the axial position, and the axial positions of the two end punching sheets 1 and the center punching sheets 2 when being welded are the same.

[0062] The punching sheet 1 at both ends includes two end bodies 11, a first spray hole 12, a secondary spray hole 13, and a tail spray hole 14. The first spray hole 12 is opened on the two end bodies 11, and the first spray hole 12 is composed of one hole. There are eight groups of the first spray holes 12 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with secondary spray holes 13, and the secondary spray holes 13 are composed of two holes. There are eight groups of the secondary spray holes 13 and they are opened on the two end bodies 11 at equal distances. The two end bodies 11 are opened with tail spray holes 14, and the tail spray holes 14 are composed of three holes. There are eight groups of the tail spray holes 14 and they are opened on the two end bodies 11 at equal distances. The distances of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14 from the center of the two end bodies 11 are reduced in the order of the first spray hole 12, the secondary spray hole 13, and the tail spray hole 14.

[0063] The center punch 2 includes a center body 21, a protrusion 22, and a cooling circuit 23. The protrusions 22 are distributed on the center body 21, and the protrusions 22 are fixedly connected to the center body 21. A plurality of protrusions 22 form a cooling circuit 23 on the outer surface of the center body 21.

[0064] In the third embodiment of the present invention, the first spray hole 12 is composed of a rectangular hole, the long side of the first spray hole 12 is oriented toward the circumferential direction of the two end bodies 11, the secondary spray hole 13 is composed of two right-angled trapezoidal holes, the two right-angled trapezoidal holes of the secondary spray hole 13 are symmetrical to each other, the tail spray hole 14 is composed of three square holes, the hole spacing between the three square holes of the tail spray hole 14 is larger than the hole spacing between the two right-angled trapezoidal holes of the secondary spray hole 13, the distances between the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 and the center of the two end bodies 11 gradually decrease, and after the two end punching sheets 1 are rotated and stacked and welded, the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 are overlapped in sequence to form an oil spray hole, and when the cooling oil contacts the two end bodies 11, it passes through the two ends in the order of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14. Punching sheet 1 (other holes that are not arranged in the right order will prevent cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap), the secondary spray hole 13 in the shape of a right-angled trapezoid can increase the circumferential flow distance of the cooling oil, thereby enlarging the circumferential distance between the three square holes of the tail spray hole 14 (compared with the circumferential distance between the three holes of the tail spray hole 14 in embodiments one and two), and the spray range is wider (compared with embodiments one and two, the circumferential spray range is larger), the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed out, because the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be tilted inwardly sprayed to the stator end winding to cool the winding.

[0065] In embodiment three of the present invention, welding reserved grooves 3 are provided on the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 are opened on the outer surfaces of the two end punching sheets 1 and the center punching sheet 2. The welding reserved grooves 3 between the two end punching sheets 1 are aligned with each other, and the welding reserved grooves 3 between the middle punching sheets are aligned with each other. The middle punching sheets on both sides are aligned with the welding reserved seams on the two end punching sheets 1. Space is left for welding through the welding grooves 5 on the two end punching sheets 1 and the center punching sheet 2, which is convenient for construction personnel to operate.

[0066] In the third embodiment of the present invention, the cooling oil can be sprayed out from the holes along the direction of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14. Other holes with incorrect arrangement order will prevent the cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap.

[0067] In the third embodiment of the present invention, the outermost diameter of the two end punches 1 is consistent with the outer diameter of the outer surface of the center punch 2, and the two end punches 1 and the center punch 2 with the same outer surface diameter cooperate with the core shell to form a cooling circuit 23.

[0068] In the third embodiment of the present invention, the two end punches 1 and the center punch 2 are installed in the core housing with interference fit. The oil circuit is sealed by the interference fit between the two end punches 1 and the center punch 2 and the core housing, and sealing parts such as oil rings are eliminated, thereby reducing costs.

[0069] In the implementation scheme of embodiment 3 of the present invention:

[0070] During production, the two end punching sheets 1 are welded in sequence along the axial position, the center punching sheets 2 are welded in sequence along the axial position, and the center punching sheets 2 at both ends are welded in sequence with one of the two end punching sheets 1 along the axial position. The welding grooves 5 on the two end punching sheets 1 and the center punching sheet 2 leave space for welding, which is convenient for construction personnel to operate. After welding is completed and installed in the core shell, the core shell is heated, and then the present invention is kept at room temperature and placed in the core shell. When the shell temperature cools down, it shrinks and interferes with the outer diameter of the two end punching sheets 1 to seal the oil circuit, eliminate sealing parts such as oil rings, and reduce costs. At the same time, the protrusions 22 on the center body 21 are interference fitted with the core shell, and a cooling circuit 23 is formed between the protrusions 22. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed cooling circuit 23 and contacts with the core for cooling. When the cooling oil flows in the cooling circuit 23 to When in contact with the two end bodies 11, they pass through the two end punching sheets 1 in sequence along the order of the first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 (other holes with incorrect arrangement order will prevent cooling oil from flowing out because the first spray hole 12 and the tail spray hole 14 do not overlap). The secondary spray hole 13 in the shape of a right-angled trapezoid can increase the circumferential flow distance of the cooling oil, thereby enlarging the circumferential distance between the three square holes of the tail spray hole 14 (larger than the circumferential distance between the three holes of the tail spray hole 14 in embodiments one and two), so that the spray range is wider (compared with embodiments one and two, the circumferential spray range is larger). The first spray hole 12, the secondary spray hole 13 and the tail spray hole 14 located in the axial direction are trumpet-shaped, which can make the spray range of the cooling oil wider when it is sprayed out. Since the distance between the first spray hole 12 and the center of the iron core is greater than the distance between the tail spray hole 14 and the center of the iron core, the cooling oil can be tilted inwardly sprayed to the stator end winding to cool the winding.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-spraying heat dissipation structure for the stator end of an oil-cooled motor, comprising two end punching sheets (1) and a center punching sheet (2), characterized in that: The two end punching sheets (1) are welded in sequence along the axial position, and the center punching sheets (2) are welded in sequence along the axial position. The center punching sheets (2) at the two ends are each welded in sequence with one of the two end punching sheets (1) along the axial position, and the axial positions of the two end punching sheets (1) and the center punching sheet (2) are the same during welding. The two-end punching sheet (1) comprises two-end bodies (11), a first spray hole (12), a second spray hole (13), and a tail spray hole (14). The two-end bodies (11) are provided with a first spray hole (12), the first spray hole (12) is composed of one hole, there are eight groups of first spray holes (12) and they are equidistantly provided on the two-end bodies (11). The two-end bodies (11) are provided with a second spray hole (13), the second spray hole (13) is composed of two holes, and the second spray hole (13) There are eight groups of the tail spray holes (14) equidistantly formed on the two end bodies (11); the two end bodies (11) are provided with tail spray holes (14), the tail spray holes (14) are composed of three holes, there are eight groups of the tail spray holes (14) equidistantly formed on the two end bodies (11), and the distances of the first spray hole (12), the secondary spray hole (13) and the tail spray hole (14) from the center of the two end bodies (11) decrease in the order of the first spray hole (12), the secondary spray hole (13) and the tail spray hole (14); The center punch (2) comprises a center body (21), a protrusion (22), and a cooling circuit (23); the protrusions (22) are distributed on the center body (21); the protrusions (22) are fixedly connected to the center body (21); and a plurality of the protrusions (22) form a cooling circuit (23) on the outer surface of the center body (21).

2. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 1, characterized in that: The first spray hole (12) is composed of a square hole, the second spray hole (13) is composed of two square holes, and the tail spray hole (14) is composed of three square holes. The distances between the first spray hole (12), the second spray hole (13) and the tail spray hole (14) and the center of the two end bodies (11) gradually decrease. After the punching sheets (1) at the two end are rotated and overlapped and welded, the first spray hole (12), the second spray hole (13) and the tail spray hole (14) are overlapped in sequence to form a spray hole.

3. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 1, characterized in that: The first spray hole (12) is composed of a rectangular hole, the long side of which faces the circumferential direction of the two end bodies (11); the second spray hole (13) is composed of two rectangular holes, the long side of which faces the radial direction of the two end bodies (11); the tail spray hole (14) is composed of a square hole and two rectangular holes, the long side of which faces the circumferential direction of the two end bodies (11); the distances between the first spray hole (12), the second spray hole (13) and the tail spray hole (14) and the center of the two end bodies (11) gradually decrease; after the two end punching sheets (1) are rotated and stacked and welded, the first spray hole (12), the second spray hole (13) and the tail spray hole (14) are overlapped in sequence to form a spray hole.

4. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 1, characterized in that: The first spray hole (12) is composed of a rectangular hole, the long side of which faces the circumferential direction of the two end bodies (11), the secondary spray hole (13) is composed of two right-angled trapezoidal holes, the two right-angled trapezoidal holes of the secondary spray hole (13) are symmetrical to each other, the tail spray hole (14) is composed of three square holes, the hole spacing between the three square holes of the tail spray hole (14) is greater than the hole spacing between the two right-angled trapezoidal holes of the secondary spray hole (13), the distances between the first spray hole (12), the secondary spray hole (13) and the tail spray hole (14) and the center of the two end bodies (11) gradually decrease, and after the two end punching sheets (1) are rotationally stacked and welded, the first spray hole (12), the secondary spray hole (13) and the tail spray hole (14) are overlapped in sequence to form a spray hole.

5. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to any one of claims 1 to 4, characterized in that: The two end punching sheets (1) and the center punching sheet (2) are provided with welding reserved grooves (3), and the welding reserved grooves (3) are opened on the outer surfaces of the two end punching sheets (1) and the center punching sheet (2). The positions of the welding reserved grooves (3) between the two end punching sheets (1) are aligned with each other, the positions of the welding reserved grooves (3) between the middle punching sheets are aligned with each other, and the welding reserved seams on the middle punching sheets and the two end punching sheets (1) located on both sides are aligned with each other.

6. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 5, characterized in that: The cooling oil can be sprayed out from the holes along the direction of the first spray hole (12), the secondary spray hole (13) and the tail spray hole (14).

7. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 6, characterized in that: The outermost diameters of the two end punches (1) are consistent with the outer diameter of the outer surface of the center punch (2).

8. The oil-spraying heat dissipation structure at the stator end of an oil-cooled motor according to claim 7, characterized in that: The two end punches (1) and the center punch (2) are installed in the core housing by interference fit.

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