Submerged heat sink structure and electric machine

Abstract

The application relates to the motor technical field, and particularly discloses an immersion heat dissipation structure and a motor. The immersion structure comprises a shell, a first end cover, a second end cover and a separation sleeve. The first end cover and the second end cover are fixedly connected to the two ends of the shell respectively. The first end cover, the shell and the second end cover jointly form a mounting cavity. The separation sleeve is arranged in the mounting cavity, and the mounting cavity is divided into a stator cavity and a rotor cavity which are not communicated with each other. The stator cavity is used for accommodating a stator assembly, and the rotor cavity is used for accommodating a rotor assembly. Cooling liquid flows in the stator cavity and is used for dissipating heat of the stator assembly. The separation sleeve is arranged to divide the stator cavity and the rotor cavity which are not communicated with each other. The stator assembly is accommodated in the stator cavity, and the cooling liquid flows in the stator cavity. The stator assembly is immersed in the cooling liquid for overall immersion heat dissipation, so that the heat dissipation effect of the stator assembly is good.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to an immersion heat dissipation structure and a motor. Background Technology

[0002] The stator winding ends of a motor are one of the main heat-generating areas, and poor heat dissipation can affect motor performance and lifespan. Current technology commonly uses spray cooling on the stator ends, but the contact time between the coolant and the windings is short, resulting in inadequate heat dissipation and limited performance improvement.

[0003] In response, related technologies have proposed an immersion cooling solution, in which the crown end and weld end of the stator are immersed in coolant, extending the contact time between the windings and the coolant to achieve good heat dissipation and effectively improve motor performance.

[0004] However, the relevant technical solutions only achieve heat dissipation for the crown end and welding end, which are the main heat-generating areas, and cannot provide timely and effective heat dissipation for other parts of the stator assembly. The overall heat dissipation effect of the stator assembly is not ideal. As the usage time increases, the overall temperature of the stator assembly rises to a high level, which to some extent hinders the improvement of motor performance. Summary of the Invention

[0005] The purpose of this invention is to provide an immersion heat dissipation structure and a motor to solve the problem of unsatisfactory overall heat dissipation effect of the stator assembly in related technologies.

[0006] This invention provides an immersion heat dissipation structure, comprising: case; A first end cap and a second end cap are fixedly connected to both ends of the housing, and the first end cap, the housing, and the second end cap together form an installation cavity. Both the first end cap and the second end cap are sealed with pressure rings, and the pressure rings are provided with sealing elements. An isolation sleeve is disposed within the mounting cavity. The two ends of the isolation sleeve are respectively installed on the first end cap and the second end cap. A pressure ring can be fitted onto the isolation sleeve. A sealing element is used to seal the gap between the pressure ring and the isolation sleeve. The isolation sleeve divides the mounting cavity into a stator cavity and a rotor cavity that are not interconnected. The stator cavity is used to accommodate the stator assembly, and the rotor cavity is used to accommodate the rotor assembly. Coolant flows within the stator cavity and is used to dissipate heat from the stator assembly.

[0007] As a preferred technical solution for the immersion heat dissipation structure, the first end cover is provided with a first support protrusion, the second end cover is provided with a second support protrusion, the two ends of the isolation sleeve are respectively sleeved on the first support protrusion and the second support protrusion, and a pressure ring is sealed to both the first end cover and the second end cover. The pressure ring can be sleeved on the isolation sleeve, and a sealing element is provided between the pressure ring and the isolation sleeve. The sealing element is used to seal the gap between the pressure ring and the isolation sleeve.

[0008] As a preferred technical solution for the immersion heat dissipation structure, the sealing element between the pressure ring and the isolation sleeve is provided in multiple ways. Multiple sealing grooves are provided at intervals on the side of the pressure ring facing the isolation sleeve. The multiple sealing elements are arranged one-to-one in the multiple sealing grooves and abut against the isolation sleeve.

[0009] As a preferred technical solution for the immersion heat dissipation structure, the pressure ring is formed with a positioning stop, the first end cover is provided with a first positioning step, the positioning stop of the pressure ring on the first end cover is positioned and engaged with the first positioning step, and the sealing element is pressed tightly onto the isolation sleeve; and the second end cover is provided with a second positioning step, the positioning stop of the pressure ring on the second end cover is positioned and engaged with the second positioning step, and the sealing element is pressed tightly onto the isolation sleeve.

[0010] As a preferred technical solution for the immersion heat dissipation structure, a sealing gap is formed between the first end cover and the second end cover and the pressure ring thereon, and the sealing gap is coated with sealant.

[0011] As a preferred technical solution for the immersion heat dissipation structure, the isolation sleeve includes a first support section, a second support section, and an isolation section. The first support section and the second support section are respectively located at both ends of the isolation section. The first support section is sleeved on the first support protrusion, and the second support section is sleeved on the second support protrusion. The wall thickness of the first support section and / or the second support section is greater than the wall thickness of the isolation section.

[0012] As a preferred technical solution for the immersion heat dissipation structure, the stator assembly includes a stator core, which is sleeved on the isolation sleeve. The stator core divides the stator cavity into a first heat dissipation cavity and a second heat dissipation cavity. The stator core is provided with a heat dissipation channel. The first heat dissipation cavity and the second heat dissipation cavity are connected through the heat dissipation channel. One of the first heat dissipation cavity and the second heat dissipation cavity is connected to the liquid inlet, and the other is connected to the liquid outlet.

[0013] As a preferred technical solution for the immersion heat dissipation structure, the liquid inlet is located below the stator core axis, and the liquid outlet is located at the top or upper part of the housing.

[0014] As a preferred technical solution for the immersion heat dissipation structure, the heat dissipation channel includes a plurality of first heat dissipation channels and a plurality of second heat dissipation channels. The first heat dissipation channels and the second heat dissipation channels extend along the axial direction of the stator core. The plurality of first heat dissipation channels correspond one-to-one with a plurality of slots on the stator core and are spaced apart from the slots along the radial direction of the stator core. The plurality of second heat dissipation channels are connected one-to-one to the end of the slot away from the first heat dissipation channel.

[0015] The present invention provides an electric motor including any of the above-described immersion heat dissipation structures.

[0016] The beneficial effects of this invention are as follows: This invention provides an immersion heat dissipation structure, which sets up an isolation sleeve to separate the stator cavity and the rotor cavity, which are not interconnected. The stator assembly is housed in the stator cavity and coolant flows in the stator cavity. The coolant provides immersion heat dissipation for the entire stator assembly, ensuring good heat dissipation effect for the entire stator assembly.

[0017] This invention provides an electric motor in which the overall performance is further improved and the service life is extended by setting the immersion heat dissipation structure of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the motor structure in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the motor with the rotor assembly and wiring harness hidden in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the sealing fit between the isolation sleeve and the pressure ring in an embodiment of the present invention; Figure 4 This is a schematic diagram of the stator assembly in an embodiment of the present invention; Figure 5 This is a partial enlarged view of the end face of the stator assembly in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first end cap in an embodiment of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the first end cap in an embodiment of the present invention; Figure 8 This is a schematic diagram of the shell structure in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the second end cap in an embodiment of the present invention; Figure 10 This is a schematic diagram of the pressure ring structure in an embodiment of the present invention; Figure 11 This is a cross-sectional view of the isolation sleeve in Embodiment 2 of the present invention; Figure 12This is a cross-sectional view of the isolation sleeve in Embodiment 3 of the present invention; Figure 13 This is a cross-sectional view of the isolation sleeve in Embodiment 4 of the present invention; Figure 14 This is a cross-sectional view of the isolation sleeve in Embodiment 5 of the present invention.

[0019] In the picture: 100. Winding; 1. Stator core; 11. First heat dissipation channel; 12. Cable groove; 121. Second heat dissipation channel; 13. Third heat dissipation channel; 2. Housing; 201. First heat dissipation cavity; 202. Second heat dissipation cavity; 21. First stop; 22. Second stop; 23. Limiting protrusion; 24. First liquid outlet; 3. Isolation sleeve; 31. First support section; 32. Second support section; 33. Isolation section; 301. Stop protrusion; 4. First end cap; 41. First support protrusion; 42. First positioning step; 5. Second end cap; 51. Second support protrusion; 52. Second positioning step; 53. Second liquid inlet; 6. Pressure ring; 61. Sealing groove; 62. Positioning stop; 63. Sealing element. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1 like Figures 1-10 As shown, this embodiment of the invention provides an immersion heat dissipation structure for an electric motor, used for immersion cooling of the stator assembly. The immersion heat dissipation structure includes a housing 2, a first end cover 4, a second end cover 5, and an isolation sleeve 3. The first end cover 4 and the second end cover 5 are fixedly connected to both ends of the housing 2, and are sealed to the housing 2. The first end cover 4, the housing 2, and the second end cover 5 together form a mounting cavity, which is cylindrical in shape, with its axis coinciding with the axes of the stator assembly and the rotor assembly. The isolation sleeve 3 is disposed within the mounting cavity, with its axis coinciding with the axis of the mounting cavity. Both ends of the isolation sleeve 3 are respectively mounted on the first end cover 4 and the second end cover 5. A pressure ring 6 is sealed to both the first end cover 4 and the second end cover 5, and the pressure ring 6 is located within the stator cavity. The pressure ring 6 can be fitted onto the isolation sleeve 3. A sealing element 63 is provided on the pressure ring 6, located between the pressure ring 6 and the isolation sleeve 3, and used to seal the gap between them. In this embodiment, the isolation sleeve 3 is a non-metallic component, such as a carbon fiber component, glass fiber component, or plastic component. It can be manufactured by carbon fiber winding, glass fiber winding, or injection molding. The relevant process methods are existing technologies in the art and will not be described further here. The isolation sleeve 3 divides the mounting cavity into a non-communicating stator cavity and a rotor cavity. The rotor cavity is cylindrical, and the stator cavity is a hollow cylinder. The stator cavity is used to accommodate the stator assembly, and the rotor cavity is used to accommodate the rotor assembly. Cooling oil flows within the stator cavity, and the cooling oil is used to dissipate heat from the stator assembly. In this embodiment, the immersion heat dissipation structure separates the stator cavity and rotor cavity into independent spaces by setting an isolation sleeve 3. The stator assembly is housed in the stator cavity, and coolant flows in the stator cavity. The coolant provides immersion heat dissipation for the entire stator assembly, ensuring good overall heat dissipation for the stator assembly.

[0025] Specifically, such as Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, the first end cap 4 has a first support protrusion 41 on the side facing the housing 2, and the second end cap 5 has a second support protrusion 51 on the side facing the housing 2. Both the first support protrusion 41 and the second support protrusion 51 are annular structures. The isolation sleeve 3 is a hollow cylindrical structure. The two ends of the isolation sleeve 3 are respectively fitted onto the first support protrusion 41 and the second support protrusion 51, so that the isolation sleeve 3 is reliably placed in the mounting cavity by the first support protrusion 41 and the second support protrusion 51 together.

[0026] Furthermore, multiple sealing elements 63 are provided between the pressure ring 6 and the isolation sleeve 3. Multiple sealing grooves 61 are provided at intervals on the side of the pressure ring 6 facing the isolation sleeve 3. The multiple sealing elements 63 are correspondingly arranged in the multiple sealing grooves 61 and abut against the isolation sleeve 3. The sealing grooves 61 are annular grooves, and their number can be 2, 3 or 4. In this embodiment, the number of sealing grooves 61 is preferably 2, and the 2 sealing grooves 61 are arranged at intervals along the axial direction of the isolation sleeve 3. The corresponding sealing element 63 is preferably a sealing ring. The number of sealing rings can be 2, 3 or 4. In this embodiment, the number of sealing rings is preferably 2. The 2 sealing rings correspond to 2 sealing grooves 61 respectively. The depth of the sealing groove 61 is less than the diameter of the sealing ring. During installation, the part of the sealing ring exposed in the sealing groove 61 is pressed against the wall of the isolation sleeve 3 and the groove of the sealing groove 61 by the pressure ring 6 and the isolation sleeve 3, thereby achieving a seal between the pressure ring 6 and the isolation sleeve 3, and a sealed connection between the pressure ring 6 and the end cover, thereby achieving a seal between the stator cavity and the rotor cavity, while providing reliable support for the isolation sleeve 3.

[0027] Furthermore, such as Figure 2 , Figure 3 and Figure 10As shown, the pressure ring 6 has a positioning stop 62, the first end cap 4 has a first positioning step 42, and the second end cap 5 has a second positioning step 52. The positioning stop 62 of the pressure ring 6 on the first end cap 4 is positioned and engaged with the first positioning step 42, pressing the seal 63 onto the isolation sleeve 3. Similarly, the positioning stop 62 of the pressure ring 6 on the second end cap 5 is positioned and engaged with the second positioning step 52, pressing the seal 63 onto the isolation sleeve 3. The connection between the first end cap 4 and the pressure ring 6 can be either an interference fit or a bolted connection. When the first end cap 4 and the pressure ring 6 are connected by an interference fit, the interference fit surfaces between the first end cap 4 and the pressure ring 6 meet the sealing requirements between the pressure ring 6 and the first end cap 4. When the first end cap 4 and the pressure ring 6 are connected by bolts, since the first positioning step 42 and the pressure ring 6 are positioned and fitted, there are at least two mating surfaces between them, forming a labyrinth seal. In this case, additional sealant can be applied to the positioning and fitting surfaces of the first positioning step 42 and the pressure ring 6 to further ensure the sealing effect. At the same time, sealant should be applied to the threaded section of the bolt to prevent coolant leakage through the threaded joint. Similarly, the connection method, specific assembly process, and sealing method between the second end cap 5 and the pressure ring 6 are the same as those between the first end cap 4 and the pressure ring 6, and will not be described again here.

[0028] Optionally, a sealing gap is formed between the first end cap 4 and the second end cap 5 and the pressure ring 6 thereon, and sealant is applied to the sealing gap. The sealing gap between the first end cap 4 and the pressure ring 6 is annular and continuous along the circumference of the pressure ring 6. Sealant is applied continuously before assembly, and after the pressure ring 6 is assembled, the sealant fills the sealing gap between the first end cap 4 and the pressure ring 6, achieving a continuous circumferential seal between the first end cap 4 and the pressure ring 6. This sealing gap prevents sealant overflow due to compression during assembly, thus preventing coolant contamination. Similarly, a sealing gap is formed between the second end cap 5 and the pressure ring 6, also annular and continuous along the circumference of the pressure ring 6. Sealant is applied continuously before assembly, and after the pressure ring 6 is assembled, the sealant fills the sealing gap between the second end cap 5 and the pressure ring 6, achieving a continuous circumferential seal between the second end cap 5 and the pressure ring 6. This sealing gap prevents sealant overflow due to compression during assembly, thus preventing coolant contamination.

[0029] Furthermore, such as Figures 2-5As shown, the stator assembly includes a stator core 1, which is fitted onto an isolation sleeve 3. The stator core 1 and the isolation sleeve 3 are fitted together via a shaft hole, such as a clearance fit or a transition fit, to ensure that the isolation sleeve 3 fits snugly against the stator core 1, avoiding excessive occupation of the air gap between the stator assembly and the rotor assembly. The stator core 1 divides the stator cavity into a first heat dissipation cavity 201 and a second heat dissipation cavity 202. The stator core 1 is provided with a heat dissipation channel, through which the first heat dissipation cavity 201 and the second heat dissipation cavity 202 are connected. One of the first heat dissipation cavity 201 and the second heat dissipation cavity 202 is connected to a liquid inlet, and the other is connected to a liquid outlet. The coolant enters from the first heat dissipation cavity 201 or the second heat dissipation cavity 202, passes through the heat dissipation channel into the second heat dissipation cavity 202 or the first heat dissipation cavity 201, and is then discharged. During this process, the welded end and crown end of the stator assembly are respectively immersed in the coolant in the first heat dissipation cavity 201 and the second heat dissipation cavity 202 to achieve heat dissipation. At the same time, when the coolant flows through the heat dissipation channel, it dissipates heat to the stator core 1 along the axial direction of the stator core 1, ensuring a good overall heat dissipation effect for the stator assembly.

[0030] Specifically, the inlet is located below the axis of the stator core 1, and the outlet is located at the top or upper part of the housing 2 to ensure that the coolant can fill the first heat dissipation cavity 201, the second heat dissipation cavity 202, and the heat dissipation channel, ensuring sufficient and uniform heat dissipation. In this embodiment, the first end cap 4 is located at the crown end of the stator assembly, and the second end cap 5 is located at the welding end of the stator assembly. The crown end is located inside the first heat dissipation cavity 201, and the welding end is located inside the second heat dissipation cavity 202. The top or upper part of the housing 2 is provided with a first liquid outlet 24, and the second end cap 5 is provided with a second liquid outlet 53. One of the first liquid outlet 24 and the second liquid outlet 53 serves as the inlet, and the other serves as the outlet. In this embodiment, the first liquid port 24 serves as the liquid outlet and the second liquid port 53 serves as the liquid inlet. The coolant enters the second heat dissipation cavity 202 from the second liquid port 53, then enters the first heat dissipation cavity 201 after passing through the heat dissipation channel, and finally exits through the first liquid port 24. During this process, the welded end of the stator assembly, the stator core 1, and the crown end of the stator assembly are cooled in sequence.

[0031] Specifically, such as Figures 4-5As shown, the heat dissipation channel includes multiple first heat dissipation channels 11 and multiple second heat dissipation channels 121. Both the first heat dissipation channels 11 and the second heat dissipation channels 121 extend axially along the stator core 1. The multiple first heat dissipation channels 11 correspond one-to-one with multiple slots 12 on the stator core 1, and are spaced apart from the slots 12 along the radial direction of the stator core 1. The multiple second heat dissipation channels 121 are connected one-to-one to the end of the slot 12 furthest from the first heat dissipation channel 11. Along the flow direction of the coolant, the cross-sectional shape of the first heat dissipation channel 11 is a circular hole, an elliptical hole, or an elongated hole, etc.; the second heat dissipation channels 121 are located at the opening of the slot 12. Along the radial direction of the stator core 1, coolant flows near the bottom and opening of each slot 12, thereby dissipating heat from the slot 12 and the internal winding 100, ensuring uniform heat dissipation and avoiding localized high temperatures.

[0032] Optionally, the heat dissipation channel also includes multiple third heat dissipation channels 13. Along the circumference of the stator core 1, the multiple third heat dissipation channels 13 are staggered with multiple wire slots 12, thereby achieving heat dissipation on both sides of the wire slots 12 along the circumference of the stator core 1.

[0033] Furthermore, such as Figure 2 , Figure 3 and Figure 8 As shown, the two ends of the housing 2 are respectively provided with a first stop 21 and a second stop 22. The first end cover 4 is positioned and engaged with the housing 2 through the first stop 21, and the second end cover 5 is positioned and engaged with the housing 2 through the second stop 22. Both the first end cover 4 and the second end cover 5 can be sealed with the housing 2 by rubber ring sealing or by applying sealant. The housing 2 is provided with an annular limiting protrusion 23, which is used to engage with the stator core 1 and limit the axial position of the stator core 1. During the assembly process, firstly, the two pressure rings 6 are installed to the first end cover 4 and the second end cover 5 respectively. The first end cover 4 is installed to one end of the housing 2. Then, the stator assembly, the isolation sleeve 3, and the rotor assembly are inserted from the opening at the other end of the housing 2, and the isolation sleeve 3 is sealed and engaged with the sealing ring on the pressure ring 6. The second support protrusion 51 on the second end cover 5 engages with the isolation sleeve 3, and the second end cover 5 is pushed axially to make the isolation sleeve 3 seal and engage with the sealing ring on the pressure ring 6 on the second end cover 5.

[0034] This invention provides an electric motor, including the immersion heat dissipation structure described in the embodiments of this invention. By providing the immersion heat dissipation structure described in the embodiments of this invention, the overall performance of the motor is further improved, and its service life is extended.

[0035] Example 2 To avoid repetitive description, this embodiment will only describe the differences from Embodiment 1. The difference between this embodiment and Embodiment 1 is that the isolation sleeve 3 in this embodiment has a different structure than the isolation sleeve 3 in Embodiment 1.

[0036] like Figure 11 As shown, the isolation sleeve 3 in this embodiment includes a first support section 31, a second support section 32, and an isolation section 33. The first support section 31 and the second support section 32 are located at opposite ends of the isolation section 33, and are integrally formed. The first support section 31 is fitted onto the first support protrusion 41, and the second support section 32 is fitted onto the second support protrusion 51. The wall thickness of both the first support section 31 and the second support section 32 is greater than the wall thickness of the isolation section 33, and the outer surface of the isolation sleeve 3 is smoothly arranged along its axial direction. This arrangement ensures proper fit with the stator core 1 while reducing the wall thickness of the isolation section 33 while maintaining structural strength, thereby further reducing the air gap occupied between the stator assembly and the rotor assembly. The isolation sleeve 3 in this embodiment is a non-metallic component, such as a carbon fiber component or a glass fiber component, which can be formed by winding carbon fiber or glass fiber. The relevant processing methods are existing technologies in the field and will not be described here.

[0037] Example 3 To avoid repetitive description, this embodiment will only describe the differences from Embodiment 1. The difference between this embodiment and Embodiment 1 is that the isolation sleeve 3 in this embodiment has a different structure than the isolation sleeve 3 in Embodiment 1.

[0038] like Figure 12As shown, the isolation sleeve 3 in this embodiment includes a first support section 31, a second support section 32, and an isolation section 33. The first support section 31 and the second support section 32 are located at opposite ends of the isolation section 33, and are integrally formed. The first support section 31 is fitted onto the first support protrusion 41, and the second support section 32 is fitted onto the second support protrusion 51. The wall thickness of both the first support section 31 and the second support section 32 is greater than the wall thickness of the isolation section 33. Along the axial direction of the isolation sleeve 3, the outer surface of one of the first support section 31 and the second support section 32 is smoothly disposed with respect to the outer surface of the isolation section 33. For example, the outer surface of the first support section 31 protrudes radially outward relative to the outer surface of the isolation section 33, while the outer surface of the second support section 32 is smoothly disposed with respect to the outer surface of the isolation section 33. When assembled with the stator core 1, the stator core 1 is pressed in from one end of the second support section 32. For example, the outer surface of the first support section 31 is smoothly arranged relative to the outer surface of the isolation section 33, and the outer surface of the second support section 32 protrudes radially outward relative to the outer surface of the isolation section 33. During assembly with the stator core 1, the stator core 1 is pressed in from one end of the first support section 31. This arrangement ensures proper fit with the stator core 1 while reducing the wall thickness of the isolation section 33 while maintaining structural strength, thereby further reducing the air gap occupied between the stator assembly and the rotor assembly. In this embodiment, the isolation sleeve 3 is a non-metallic component, such as a carbon fiber or glass fiber component, which can be formed by winding carbon fiber or glass fiber. The related processing methods are existing technologies in the field and will not be described further here.

[0039] Example 4 To avoid repetitive description, this embodiment will only describe the differences from Embodiment 1. The difference between this embodiment and Embodiment 1 is that the isolation sleeve 3 in this embodiment has a different structure than the isolation sleeve 3 in Embodiment 1.

[0040] like Figure 13As shown, the isolation sleeve 3 in this embodiment includes a first support section 31, a second support section 32, and an isolation section 33. The first support section 31 and the second support section 32 are located at opposite ends of the isolation section 33, and are integrally formed. The first support section 31 is fitted onto the first support protrusion 41, and the second support section 32 is fitted onto the second support protrusion 51. The wall thickness of either the first support section 31 or the second support section 32 is greater than the wall thickness of the isolation section 33. For example, the wall thickness of the first support section 31 can be greater than that of the isolation section 33, or the wall thickness of the second support section 32 can be greater than that of the isolation section 33. Here, we will use the example of the first support section 31 having a greater wall thickness than the isolation section 33. The outer surface of the first support section 31 protrudes radially outward relative to the outer surface of the isolation section 33, while the outer surface of the second support section 32 is smoothly arranged relative to the outer surface of the isolation section 33. When assembled with the stator core 1, the stator core 1 is pressed in from one end of the second support section 32. This configuration ensures compatibility with the stator core 1 while reducing the wall thickness of the isolation section 33 while meeting structural strength requirements, thereby further reducing the air gap occupied between the stator assembly and the rotor assembly.

[0041] Example 5 To avoid repetitive description, this embodiment will only describe the differences from Embodiment 1. The difference between this embodiment and Embodiment 1 is that the isolation sleeve 3 in this embodiment has a different structure than the isolation sleeve 3 in Embodiment 1.

[0042] like Figure 14 As shown, the isolation sleeve 3 in this embodiment includes a first support section 31, a second support section 32, and an isolation section 33. The first support section 31 and the second support section 32 are located at opposite ends of the isolation section 33, and the first support section 31, the second support section 32, and the isolation section 33 are integrally formed. The first support section 31 is fitted onto the first support protrusion 41, and the second support section 32 is fitted onto the second support protrusion 51, and the outer surface of the isolation sleeve 3 is smoothly arranged along the axial direction of the isolation sleeve 3. A ring-shaped stop protrusion 301 is provided on the outer surface of the first support section 31 or the second support section 32. The stop protrusion 301 can cooperate with the pressure ring 6 and limit the axial position of the pressure ring 6 on the isolation sleeve 3, reducing the number of axial adjustments during assembly and improving assembly efficiency.

[0043] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An immersion heat dissipation structure, characterized in that, include: Shell (2); The first end cap (4) and the second end cap (5) are fixedly connected to the two ends of the housing (2), respectively. The first end cap (4), the housing (2) and the second end cap (5) together form an installation cavity. The first end cap (4) and the second end cap (5) are both sealed with pressure rings (6), and the pressure rings (6) are provided with sealing elements (63). An isolation sleeve (3) is disposed in the mounting cavity. The two ends of the isolation sleeve (3) are respectively installed on the first end cover (4) and the second end cover (5). The pressure ring (6) can be fitted onto the isolation sleeve (3). The sealing element (63) is used to seal the gap between the pressure ring (6) and the isolation sleeve (3). The isolation sleeve (3) divides the mounting cavity into a stator cavity and a rotor cavity that are not connected to each other. The stator cavity is used to accommodate the stator assembly, and the rotor cavity is used to accommodate the rotor assembly. Coolant flows in the stator cavity and is used to dissipate heat from the stator assembly.

2. The immersion heat dissipation structure according to claim 1, characterized in that, The first end cap (4) is provided with a first support protrusion (41), and the second end cap (5) is provided with a second support protrusion (51). The two ends of the isolation sleeve (3) are respectively sleeved on the first support protrusion (41) and the second support protrusion (51).

3. The immersion heat dissipation structure according to claim 1, characterized in that, The sealing element (63) between the pressure ring (6) and the isolation sleeve (3) is provided in multiple ways. The pressure ring (6) is provided with multiple sealing grooves (61) at intervals on the side facing the isolation sleeve (3). The multiple sealing elements (63) are provided in the multiple sealing grooves (61) and abut against the isolation sleeve (3).

4. The immersion heat dissipation structure according to claim 1, characterized in that, The pressure ring (6) has a positioning stop (62), the first end cap (4) has a first positioning step (42), the positioning stop (62) of the pressure ring (6) on the first end cap (4) is positioned and engaged with the first positioning step (42), and the sealing member (63) is pressed on the isolation sleeve (3); and the second end cap (5) has a second positioning step (52), the positioning stop (62) of the pressure ring (6) on the second end cap (5) is positioned and engaged with the second positioning step (52), and the sealing member (63) is pressed on the isolation sleeve (3).

5. The immersion heat dissipation structure according to claim 4, characterized in that, A sealing gap is formed between the first end cap (4) and the second end cap (5) and the pressure ring (6) on them, and the sealing gap is coated with sealant.

6. The immersion heat dissipation structure according to claim 2, characterized in that, The isolation sleeve (3) includes a first support section (31), a second support section (32), and an isolation section (33). The first support section (31) and the second support section (32) are located at both ends of the isolation section (33). The first support section (31) is sleeved on the first support protrusion (41), and the second support section (32) is sleeved on the second support protrusion (51). The wall thickness of the first support section (31) and / or the second support section (32) is greater than the wall thickness of the isolation section (33).

7. The immersion heat dissipation structure according to any one of claims 1-6, characterized in that, The stator assembly includes a stator core (1), which is sleeved on the isolation sleeve (3). The stator core (1) divides the stator cavity into a first heat dissipation cavity (201) and a second heat dissipation cavity (202). The stator core (1) is provided with a heat dissipation channel. The first heat dissipation cavity (201) and the second heat dissipation cavity (202) are connected through the heat dissipation channel. One of the first heat dissipation cavity (201) and the second heat dissipation cavity (202) is connected to the liquid inlet, and the other is connected to the liquid outlet.

8. The immersion heat dissipation structure according to claim 7, characterized in that, The liquid inlet is located below the axis of the stator core (1), and the liquid outlet is located at the top or upper part of the housing (2).

9. The immersion heat dissipation structure according to claim 8, characterized in that, The heat dissipation channel includes a plurality of first heat dissipation channels (11) and a plurality of second heat dissipation channels (121). The first heat dissipation channels (11) and the second heat dissipation channels (121) extend along the axial direction of the stator core (1). The plurality of first heat dissipation channels (11) correspond one-to-one with a plurality of wire slots (12) on the stator core (1) and are spaced apart from the wire slots (12) along the radial direction of the stator core (1). The plurality of second heat dissipation channels (121) are connected one-to-one to the end of the wire slot (12) away from the first heat dissipation channel (11).

10. An electric motor, characterized in that, Includes the immersion heat dissipation structure as described in any one of claims 1-9.

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