An oil-cooling motor stator core surface oil cooling circuit heat dissipation structure

Abstract

The present invention discloses a heat dissipation structure of an oil-cooled motor stator core surface oil cooling circuit, which belongs to the field of oil-cooled motor stators and includes end punching sheets and middle punching sheets. Compared with the prior art, the present invention welds the end punching sheets and the middle punching sheets in an axially staggered sequence during production. When installed with a housing, the housing and the present invention are interference fit to seal the oil circuit, eliminating sealing parts such as oil rings, and reducing costs. At the same time, a number of oil retaining blocks on the middle punching sheet are interference fit with the housing, and a circuit is formed between the oil retaining blocks. When the cooling oil enters from the oil inlet hole of the housing, it flows in all directions along the formed circuit, effectively increasing the flow rate of the cooling oil, allowing the cooling oil to fully contact and cool the core, and improving the cooling effect.

Description

Technical Field

[0001] The invention relates to the field of oil-cooled motor stators, in particular to an oil-cooled motor stator iron core surface oil-cooled circuit heat dissipation structure. 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 and high degree of freedom in structural design.

[0003] Existing oil-cooled motors use sealing parts such as oil rings in conjunction with the stator core and the housing to form a sealed oil path cavity between the stator core and the housing. When cooling, cooling oil is mostly sprayed onto the surface of the stator through oil spray holes to achieve stator cooling. However, the contact area between the cooling oil and the stator is relatively small, and the cooling oil cannot fully contact the stator surface, which affects the heat dissipation efficiency of the stator. Summary of the invention

[0004] The purpose of the present invention is to solve the problem raised in the background technology, and designs a heat dissipation structure of an oil-cooling circuit on the surface of an oil-cooling motor stator core.

[0005] The technical solution of the present invention to achieve the above-mentioned purpose is a heat dissipation structure of an oil-cooled motor stator core surface oil-cooling circuit, comprising end punching sheets and middle punching sheets, the end punching sheets and the middle punching sheets are arranged in sequence along the axial direction, the end punching sheets are located at both ends of the middle punching sheets and are welded to the middle punching sheets, the end punching sheets are welded to each other, and the middle punching sheets are welded to each other;

[0006] The end face punching sheet comprises an end face body, a first oil injection hole, a second oil injection hole, and a third oil injection hole. The first oil injection hole is composed of a square hole and is equidistantly opened at the outer circle position of the end face body. The second oil injection hole is composed of two square holes and is equidistantly opened at the outer circle position of the end face body. The third oil injection hole is composed of three square holes and is equidistantly opened at the outer circle position of the end face body. The first oil injection hole, the second oil injection hole, and the third oil injection hole are at the same distance from the center position of the end face body.

[0007] The middle punch comprises a middle body and an oil baffle, wherein the oil baffle is distributed on the outer surface of the middle body and is fixedly connected to the middle body, and the distance from the outer surface of the oil baffle to the outer surface of the middle body enables cooling oil to flow out from the first oil injection hole.

[0008] In some embodiments of the present invention, the oil baffles have uniform widths and are equidistantly distributed on the outer surface of the middle body. After the end punches are welded to the middle punches, the oil baffles form a dispersed cooling oil circuit on the surface of the middle body.

[0009] In some embodiments of the present invention, the oil baffle blocks are divided into wide and narrow types. The wide oil baffle blocks are equidistantly distributed on the outer surface of the middle body, and the narrow oil baffle blocks are fixedly connected to the outer surface of the middle body. After the end face punching sheets and the middle punching sheets are welded, the wide oil baffle blocks and the narrow oil baffle blocks form a Z-shaped cooling oil circuit on the surface of the middle body.

[0010] In some embodiments of the present invention, welding grooves are provided on the outer surfaces of the end face punches and the middle punches, and the welding grooves are opened on the outer surfaces of the end face punches and the middle punches. The welding grooves on the middle punches at both ends are axially aligned with the welding grooves on the end face punches, and the welding grooves of the middle punches are axially aligned with each other.

[0011] In some embodiments of the present invention, when the three end face punching sheets are welded to each other, the first oil injection hole, the second oil injection hole and the third oil injection hole in the axial direction overlap in sequence.

[0012] In some embodiments of the present invention, the maximum diameter of the end punch is consistent with the maximum diameter of the middle punch.

[0013] In some embodiments of the present invention, the end face punching sheets are rotated and stacked at different angles and then alternately welded, and the middle punching sheets are rotated and stacked at different angles and then alternately welded.

[0014] Beneficial effects:

[0015] The present invention provides an oil-cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor, which has the following beneficial effects. The device is designed to alternately weld the end face punchings and the middle punchings in the axial direction in sequence during manufacture, the middle punchings are welded to each other, and the end face punchings are welded to part of the middle punchings. When the shell is installed, the shell is heated, and the device is placed in the shell at room temperature. When the shell temperature cools down, it shrinks and has an interference fit with the outer diameter of the end face punchings, thereby sealing the oil circuit, eliminating sealing parts such as oil rings, and reducing costs;

[0016] At the same time, several oil baffles on the middle punch are interference fit with the shell, and a loop is formed between the oil baffles. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed loop, effectively increasing the flow rate of the cooling oil, allowing the cooling oil to fully contact and cool the iron core, thereby improving the cooling effect. When the cooling oil flows in the loop and contacts the end punch, it passes through the end punch in the order of the first oil injection hole, the second oil injection hole, and the third oil injection hole, and is finally sprayed to the winding to cool the winding (no cooling oil will pass through the oil injection holes in the wrong order).

[0017] Compared with the prior art, the present invention forms a sealed oil circuit wall by an interference fit between the end face punching sheet and the shell, eliminates sealing parts such as oil rings, and reduces costs. At the same time, the oil circuit formed by several oil baffles on the middle punching sheet is complex, which effectively increases the flow rate of the cooling oil and improves the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the first embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the explosion structure of the first embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a distributed cooling oil circuit according to the first embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of an intermediate punching sheet according to the first embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the end face punching sheet of the present invention;

[0023] Figure 6 is a schematic structural diagram of the second embodiment of the present invention;

[0024] Figure 7 It is a schematic diagram of the explosion structure of the second embodiment of the present invention;

[0025] Figure 8 is a schematic structural diagram of a Z-shaped cooling oil circuit according to the second embodiment of the present invention;

[0026] Fig. 9 It is a schematic structural diagram of the intermediate punching sheet of the second embodiment of the present invention.

[0027] In the figure, 1. end face punching plate; 2. middle punching plate; 3. dispersed cooling oil circuit; 4. Z-shaped cooling oil circuit; 5. welding groove; 11. end face body; 12. first oil spray hole; 13. second oil spray hole; 14. third oil spray hole; 21. middle body; 22. oil baffle. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Embodiment 1:

[0032] See also Figure 1-5 The present invention provides a technical solution: a heat dissipation structure of an oil-cooled motor stator core surface oil-cooling circuit, comprising an end punching sheet 1 and an intermediate punching sheet 2, the end punching sheet 1 and the intermediate punching sheet 2 are arranged in sequence along the axial direction, the end punching sheet 1 is located at both ends of the intermediate punching sheet 2 and is welded to the intermediate punching sheet 2, the end punching sheets 1 are welded to each other, and the intermediate punching sheets 2 are welded to each other;

[0033] The end face punching sheet 1 comprises an end face body 11, a first oil injection hole 12, a second oil injection hole 13, and a third oil injection hole 14. The first oil injection hole 12 is composed of a square hole and is equidistantly opened at the outer circle position of the end face body 11. The second oil injection hole 13 is composed of two square holes and is equidistantly opened at the outer circle position of the end face body 11. The third oil injection hole 14 is composed of three square holes and is equidistantly opened at the outer circle position of the end face body 11. The first oil injection hole 12, the second oil injection hole 13, and the third oil injection hole 14 are at the same distance from the center position of the end face body 11.

[0034] The middle punch 2 includes a middle body 21 and an oil baffle 22 . The oil baffle 22 is distributed on the outer surface of the middle body 21 and is fixedly connected to the middle body 21 . The distance from the outer surface of the oil baffle 22 to the outer surface of the middle body 21 enables cooling oil to flow out from the first oil injection hole 12 .

[0035] In the first embodiment of the present invention, the width of the oil baffle blocks 22 is uniform and they are evenly distributed on the outer surface of the intermediate body 21. After the end punching sheet 1 is welded to the intermediate punching sheet 2, the oil baffle blocks 22 form a dispersed cooling oil circuit 3 on the surface of the intermediate body 21. Through the interference fit of several oil baffle blocks 22 on the intermediate body 21 and the shell, a dispersed cooling oil circuit 3 is formed between the oil baffle blocks 22. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed dispersed cooling oil circuit 3, which effectively increases the flow rate of the cooling oil, makes the cooling oil fully contact and cool the iron core, and improves the cooling effect.

[0036] In the first embodiment of the present invention, welding grooves 5 are provided on the outer surfaces of the end face punching sheet 1 and the middle punching sheet 2. The welding grooves 5 are opened on the outer surfaces of the end face punching sheet 1 and the middle punching sheet 2. The welding grooves 5 on the middle punching sheets 2 at both ends are axially aligned with the welding grooves 5 on the end face punching sheet 1. The welding grooves 5 between the middle punching sheets 2 are axially aligned. The welding grooves 5 on the end face punching sheet 1 and the middle punching sheet 2 leave space for welding, which is convenient for construction personnel to operate.

[0037] In the first embodiment of the present invention, when the three end face punching sheets 1 are welded to each other, the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 in the axial direction overlap each other in sequence. When the cooling oil flows in the distributed cooling oil circuit 3 and contacts the end face punching sheet 1, it passes through the end face punching sheet 1 in the order of the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 and is finally sprayed to the winding to cool the winding. No cooling oil will pass through the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 that are not in the correct order.

[0038] In the first embodiment, the maximum diameter of the end face punching sheet 1 is consistent with the maximum diameter of the middle punching sheet 2. By using the end face punching sheet 1 and the middle punching sheet 2 with the same maximum diameter, a sealed oil circuit can be formed when the invention and the housing are interference fit, thereby eliminating sealing parts such as oil rings and reducing costs.

[0039] In the first embodiment, the end punching sheets 1 are alternately welded after being rotated and stacked at different angles, and the middle punching sheets 2 are alternately welded after being rotated and stacked at different angles.

[0040] In the implementation scheme of Example 1 of the present invention:

[0041] During production, the end face punching sheets 1 and the middle punching sheets 2 are welded alternately in sequence along the axial direction, the middle punching sheets 2 are welded alternately after being rotated and pressed at different angles, the end face punching sheets 1 are welded alternately with part of the middle punching sheets 2 after being rotated and pressed at different angles, and the welding grooves 5 on the end face punching sheets 1 and the middle punching sheets 2 are used to leave space for welding, which is convenient for construction personnel to operate. When installing with the shell, the shell is heated, and the present invention is placed in the shell at room temperature. When the shell temperature cools down, it shrinks and has an interference fit with the outer diameter of the end face body 11, sealing the oil circuit, eliminating sealing parts such as oil rings, reducing costs, and the middle body 21 Several oil baffles 22 are interference fit with the shell, and a decentralized cooling oil circuit 3 is formed between the oil baffles 22. When the cooling oil enters from the oil inlet hole of the shell, it flows in all directions along the formed decentralized cooling oil circuit 3, effectively increasing the flow rate of the cooling oil, so that the cooling oil and the iron core are fully contacted and cooled, thereby improving the cooling effect. When the cooling oil flows in the decentralized cooling oil circuit 3 and contacts the end face punching 1, it passes through the end face punching 1 in the order of the first oil injection hole 12, the second oil injection hole 13, and the third oil injection hole 14, and is finally sprayed to the winding to cool the winding (no cooling oil will pass through the oil injection holes in the wrong order).

[0042] See also Figure 5-9 The present invention provides a technical solution: a heat dissipation structure of an oil-cooled motor stator core surface oil-cooling circuit, comprising an end punching sheet 1 and an intermediate punching sheet 2, the end punching sheet 1 and the intermediate punching sheet 2 are arranged in sequence along the axial direction, the end punching sheet 1 is located at both ends of the intermediate punching sheet 2 and is welded to the intermediate punching sheet 2, the end punching sheets 1 are welded to each other, and the intermediate punching sheets 2 are welded to each other;

[0043] The end face punching sheet 1 comprises an end face body 11, a first oil injection hole 12, a second oil injection hole 13, and a third oil injection hole 14. The first oil injection hole 12 is composed of a square hole and is equidistantly opened at the outer circle position of the end face body 11. The second oil injection hole 13 is composed of two square holes and is equidistantly opened at the outer circle position of the end face body 11. The third oil injection hole 14 is composed of three square holes and is equidistantly opened at the outer circle position of the end face body 11. The first oil injection hole 12, the second oil injection hole 13, and the third oil injection hole 14 are at the same distance from the center position of the end face body 11.

[0044] The middle punch 2 includes a middle body 21 and an oil baffle 22 . The oil baffle 22 is distributed on the outer surface of the middle body 21 and is fixedly connected to the middle body 21 . The distance from the outer surface of the oil baffle 22 to the outer surface of the middle body 21 enables cooling oil to flow out from the first oil injection hole 12 .

[0045] In the second embodiment, the oil baffles 22 are divided into two types, wide and narrow. The wide oil baffles 22 are equidistantly distributed on the outer surface of the middle body 21, and the narrow oil baffles 22 are fixedly connected to the outer surface of the middle body 21. After the end punch 1 and the middle punch 2 are welded, the wide oil baffles 22 and the narrow oil baffles 22 form a Z-shaped cooling oil circuit 4 on the surface of the middle body 21. Through the interference fit of several oil baffles 22 on the middle body 21 and the shell, a Z-shaped cooling oil circuit 5 is formed between several wide oil baffles 22 and several narrow oil baffles 22. When the cooling oil enters from the oil inlet hole of the shell, it flows along the formed Z-shaped cooling oil circuit 5. There are several wide oil baffles 22 and narrow oil baffles 22 along the way to block it, which effectively increases the flow rate of the cooling oil, makes the cooling oil fully contact and cool the iron core, and improves the cooling effect.

[0046] In the second embodiment, welding grooves 5 are provided on the outer surfaces of the end face punching sheet 1 and the middle punching sheet 2. The welding grooves 5 are opened on the outer surfaces of the end face punching sheet 1 and the middle punching sheet 2. The welding grooves 5 on the middle punching sheets 2 at both ends are axially aligned with the welding grooves 5 on the end face punching sheet 1. The welding grooves 5 between the middle punching sheets 2 are axially aligned. The welding grooves 5 on the end face punching sheet 1 and the middle punching sheet 2 leave space for welding, which is convenient for construction personnel to operate.

[0047] In the second embodiment, when the three end face punching sheets 1 are welded to each other, the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 in the axial direction overlap each other in sequence. When the cooling oil flows in the distributed cooling oil circuit 3 and contacts the end face punching sheet 1, it passes through the end face punching sheet 1 in the order of the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 and is finally sprayed to the winding to cool the winding. No cooling oil will pass through the first oil injection hole 12, the second oil injection hole 13 and the third oil injection hole 14 that are not in the correct order.

[0048] In the second embodiment, the maximum diameter of the end face punching piece 1 is consistent with the maximum diameter of the middle punching piece 2. By using the end face punching piece 1 and the middle punching piece 2 with the same maximum diameter, a sealed oil circuit can be formed when the invention and the housing are interference fit, thereby eliminating sealing parts such as oil rings and reducing costs.

[0049] In the second embodiment, the end punching sheets 1 are alternately welded after being rotated and stacked at different angles, and the middle punching sheets 2 are alternately welded after being rotated and stacked at different angles.

[0050] In the implementation scheme of the second embodiment: during production, the end face punching sheets 1 and the middle punching sheets 2 are welded alternately in the axial direction in sequence, the middle punching sheets 2 are welded alternately after being rotated and pressed at different angles, the end face punching sheets 1 are welded alternately with part of the middle punching sheets 2 after being rotated and pressed at different angles, and the welding grooves 5 on the end face punching sheets 1 and the middle punching sheets 2 are used to leave space for welding, which is convenient for construction personnel to operate. When installing with the shell, the shell is heated, and the present invention is placed in the shell at room temperature. When the shell temperature cools down, it shrinks and has an interference fit with the outer diameter of the end face body 11, sealing the oil circuit, eliminating sealing parts such as oil rings, and reducing costs. At the same time, a plurality of oil retaining blocks 22 on the middle body 21 and The shell is interference fitted, and a Z-shaped cooling oil circuit 5 is formed between several wide oil baffles 22 and several narrow oil baffles 22. When the cooling oil enters from the oil inlet of the shell, it flows along the formed Z-shaped cooling oil circuit 5, and there are several wide oil baffles 22 and narrow oil baffles 22 along the way to block it, which effectively increases the flow rate of the cooling oil, so that the cooling oil and the iron core are fully in contact and cooled, thereby improving the cooling effect. When the cooling oil flows in the Z-shaped cooling oil circuit 4 and contacts with the end face punching 1, it passes through the end face punching 1 in the order of the first oil injection hole 12, the second oil injection hole 13, and the third oil injection hole 14, and is finally sprayed to the winding to cool the winding (no cooling oil will pass through the oil injection holes in the wrong order).

[0051] 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".

[0052] 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. A heat dissipation structure for an oil-cooled motor stator core surface oil-cooling circuit, comprising an end punching sheet (1) and an intermediate punching sheet (2), characterized in that: The end face punching sheets (1) and the middle punching sheets (2) are arranged in sequence along the axial direction, the end face punching sheets (1) are located at both ends of the middle punching sheets (2) and are welded to the middle punching sheets (2), the end face punching sheets (1) are welded to each other, and the middle punching sheets (2) are welded to each other; The end face punching sheet (1) comprises an end face body (11), a first oil injection hole (12), a second oil injection hole (13), and a third oil injection hole (14); the first oil injection hole (12) is composed of a square hole and is equidistantly opened at the outer circle position of the end face body (11); the second oil injection hole (13) is composed of two square holes and is equidistantly opened at the outer circle position of the end face body (11); the third oil injection hole (14) is composed of three square holes and is equidistantly opened at the outer circle position of the end face body (11); the first oil injection hole (12), the second oil injection hole (13), and the third oil injection hole (14) are at the same distance from the center position of the end face body (11); The intermediate punch (2) comprises an intermediate body (21) and an oil baffle (22). The oil baffle (22) is distributed on the outer surface of the intermediate body (21) and is fixedly connected to the intermediate body (21). The distance between the outer surface of the oil baffle (22) and the outer surface of the intermediate body (21) enables cooling oil to flow out from the first oil injection hole (12).

2. The oil-cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to claim 1, characterized in that: The oil baffles (22) have uniform widths and are equidistantly distributed on the outer surface of the middle body (21); after the end punching sheets (1) and the middle punching sheets (2) are welded, the oil baffles (22) form a dispersed cooling oil circuit (3) on the surface of the middle body (21).

3. The oil cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to claim 1, characterized in that: The oil baffle blocks (22) are divided into two types: wide and narrow. The wide oil baffle blocks (22) are evenly distributed on the outer surface of the middle body (21), and the narrow oil baffle blocks (22) are fixedly connected to the outer surface of the middle body (21). After the end punching sheet (1) and the middle punching sheet (2) are welded, the wide oil baffle blocks (22) and the narrow oil baffle blocks (22) form a Z-shaped cooling oil circuit (4) on the surface of the middle body (21).

4. The oil cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to any one of claims 1 to 3, characterized in that: Welding grooves (5) are provided on the outer surfaces of the end face punching sheet (1) and the middle punching sheet (2). The welding grooves (5) are opened on the outer surfaces of the end face punching sheet (1) and the middle punching sheet (2). The welding grooves (5) on the middle punching sheets (2) at both ends are axially aligned with the welding grooves (5) on the end face punching sheet (1), and the welding grooves (5) between the middle punching sheets (2) are axially aligned.

5. The oil cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to claim 4, characterized in that: When the three end face punching sheets (1) are welded to each other, the first oil injection hole (12), the second oil injection hole (13) and the third oil injection hole (14) in the axial direction overlap in sequence.

6. The oil-cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to claim 5, characterized in that: The maximum diameter of the end punch (1) is consistent with the maximum diameter of the middle punch (2).

7. The oil-cooling circuit heat dissipation structure on the surface of the stator core of an oil-cooled motor according to claim 6, characterized in that: The end face punching sheets (1) are rotated and stacked at different angles and then welded in an interlaced manner, and the middle punching sheets (2) are rotated and stacked at different angles and then welded in an interlaced manner.

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