Self-excitation sweeping oil injection cooling structure

Abstract

The invention discloses a self-excitation sweeping oil injection cooling structure, and relates to the technical field of motor cooling equipment, and the structure comprises an oil guiding mechanism which is disposed between a motor housing and a stator winding, and extends in the circumferential direction of the motor housing; a plurality of oil guide through holes are formed in the oil guide mechanism and are sequentially distributed in the circumferential direction of the motor shell; the multiple self-excitation sweeping nozzles are installed on the inner circumferential side of the oil guiding mechanism in the circumferential direction of the oil guiding mechanism and correspondingly communicate with the oil guiding through holes; and the outlets of the self-excitation sweeping nozzles are respectively used for facing the gaps of the stator windings, so that the structure integration and processing of the plurality of self-excitation sweeping nozzles and the motor shell in a limited space are realized, the cooling oil can cover the stator winding area more uniformly, and the heat dissipation capability of the motor is further improved.

Description

Technical Field

[0001] This invention relates to the field of motor cooling equipment technology, and in particular to a self-excited sweeping oil spray cooling structure. Background Technology

[0002] Axial flux motors have attracted widespread attention due to their compact structure, high power and torque density, and high efficiency, and are widely used in automotive, marine, and aerospace fields. However, during operation, the energy loss generated by the current flowing through the stator windings is converted into a large amount of heat, causing the internal temperature of the motor to rise. This leads to demagnetization of the permanent magnets, performance degradation, and even damage to the insulation materials, affecting the motor's service life and reliability.

[0003] Currently, direct liquid cooling is the most common cooling method for axial flux motors. Cooling oil is often used as the cooling medium for direct cooling due to its non-magnetic, non-conductive, and thermally stable properties. Most axial flux motors employ fixed-jet stator winding cooling structures such as conical nozzle oil spraying, drip nozzle oil spraying, fan-shaped nozzle oil spraying, and cylindrical nozzle oil spraying. These structures suffer from uneven heat dissipation and localized high temperatures, which are detrimental to the overall cooling of the stator windings and negatively impact motor performance and lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a self-excited sweeping oil spray cooling structure to solve the problems existing in the prior art. It realizes the structural integration and processing of multiple self-excited sweeping nozzles with the motor housing in a limited space, so that the cooling oil can cover the stator winding area more evenly and further improve the heat dissipation capacity of the motor.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a self-excited sweeping oil injection cooling structure, comprising: An oil-drawing mechanism is provided between the motor housing and the stator winding, and extends circumferentially along the motor housing; the oil-drawing mechanism has multiple oil-drawing through holes, and the oil-drawing through holes are arranged sequentially along the circumferential direction of the motor housing; The self-excited sweeping nozzles are provided in multiples and are installed circumferentially on the inner circumference of the oil-drawing mechanism and are connected to each of the oil-drawing through holes; the outlet of each self-excited sweeping nozzle is respectively used to face each stator winding gap.

[0006] Optionally, an oil-drawing interval is provided between the oil-drawing mechanism and the motor housing. The oil-drawing interval is closed and extends circumferentially along the oil-drawing mechanism, and is connected to the oil inlet end of each of the oil-drawing through holes.

[0007] Optionally, an oil inlet pipe connected to the oil inlet spacer is inserted into the motor housing.

[0008] Optionally, the inner peripheral wall of the oil extraction mechanism is provided with two baffles. The baffles are radially blocked between the oil extraction mechanism and the corresponding stator winding, and the two baffles are respectively located at both ends of the positions of all the self-excited sweeping nozzles.

[0009] Optionally, the inner peripheral wall of the oil-drawing mechanism has a closed structure and is used to surround the outer peripheral side of all the locations of the stator windings.

[0010] Optionally, the oil extraction mechanism is provided with an oil outlet through hole, which is located circumferentially along the oil extraction mechanism on the side of both baffles that are away from the self-excited sweeping nozzle.

[0011] Optionally, an oil outlet pipe connected to the oil outlet through hole is inserted into the motor housing.

[0012] Optionally, the oil extraction mechanism has an oil outlet groove on the side near the stator winding, and the oil outlet through hole is located at the bottom of the oil outlet groove.

[0013] Optionally, the oil extraction mechanism includes: An oil guide ring is used to surround the outer periphery of all the stator windings. The baffle plate and the self-excited sweep nozzle are both disposed on the inner peripheral wall of the oil guide ring. The oil guide ring has a plurality of mounting holes that correspond one-to-one with each of the self-excited sweep nozzles. An oil-leading arc plate is installed on the side of the oil guide ring away from the stator winding and has multiple oil delivery holes, each of which is connected to each of the mounting holes.

[0014] Optionally, the span between the two self-excited sweeping nozzles at both ends shall be at least half the structure of the oil extraction mechanism.

[0015] The present invention achieves the following technical effects compared to the prior art: In the self-excited sweeping oil injection cooling structure disclosed in this invention, each self-excited sweeping nozzle is integrated on the inner circumference of the oil priming mechanism and connected to each corresponding oil priming through hole. This achieves the structural integration and processing of multiple self-excited sweeping nozzles with the motor housing in a limited space, enabling the cooling oil to cover the stator winding area more evenly and further improving the motor's heat dissipation capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a self-excited sweeping oil injection cooling structure after it is assembled onto a motor, as shown in an example of the present invention. Figure 2 This is a partial three-dimensional cross-sectional view of a self-excited sweeping oil injection cooling structure after it is assembled onto a motor, as disclosed in an example of the present invention. Figure 3 This is a top-view cross-sectional view of a self-excited sweeping oil injection cooling structure assembled onto a motor, as disclosed in an example of the present invention. Figure 4 This is a three-dimensional schematic diagram of an oil-drawing arc plate in an example disclosed in this invention; Figure 5 This is a three-dimensional schematic diagram of a flow guide ring in one example disclosed in this invention; The components include: 1. Motor housing; 2. Stator core; 3. Oil priming mechanism; 4. Stator winding; 5. Oil inlet pipe; 6. Oil outlet pipe; 7. Self-excited sweeping nozzle; 8. Oil guide ring; 9. Oil priming arc plate; 10. Mounting hole; 11. Oil outlet through hole; 12. Oil outlet groove; 13. Oil delivery hole; and 14. Baffle plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0019] The purpose of this invention is to provide a self-excited sweeping oil spray cooling structure to solve the problems existing in the prior art. It realizes the structural integration and processing of multiple self-excited sweeping nozzles with the motor housing in a limited space, so that the cooling oil can cover the stator winding area more evenly and further improve the heat dissipation capacity of the motor.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 5As shown, the present invention provides a self-excited sweeping oil injection cooling structure, especially for cooling an axial flux motor. It can be understood that the axial flux motor includes a motor housing 1 and a stator core 2 disposed in the motor housing 1, and a stator winding 4 is disposed around the stator core 2. The entire self-excited sweeping oil spray cooling structure includes an oil-drawing mechanism 3 and self-excited sweeping nozzles 7. The oil-drawing mechanism 3 is disposed between the motor housing 1 and the stator winding 4 and extends circumferentially along the motor housing 1. The oil-drawing mechanism 3 has multiple oil-drawing through holes, which are arranged sequentially along the circumference of the motor housing 1. Multiple self-excited sweeping nozzles 7 are provided and installed on the inner circumference of the oil-drawing mechanism 3, and are connected to each oil-drawing through hole. The number of self-excited sweeping nozzles 7 is preferably 9 to 12, which are evenly installed on the oil-drawing mechanism 3. The outlets of the self-excited sweeping nozzles 7 are respectively directed toward the gaps of each stator winding 4. It should be noted that, taking an axial flux motor as an example, the stator core 2 is wrapped around the outer circumference of the axis of the motor housing 1. There are gaps along the circumference between two adjacent stator windings 4, which are called stator winding 4 gaps. The outlets of the self-excited sweeping nozzles 7 are respectively directed toward the gaps of each stator winding 4, thereby spraying cooling oil onto the stator winding 4 gaps. It is understandable that the oil inlet, the self-excited sweeping nozzle 7, and the gaps between each stator winding 4 are all located in the cooling oil flow path. This cooling oil flow path can be a circulating path or a unidirectional path.

[0022] Based on the above embodiments, the outlets of each sweeping nozzle 7 are respectively directed toward the center position of the gap between each stator winding 4.

[0023] As another implementation, the outlet of the self-excited sweeping nozzle 7 does not necessarily correspond to the gap of each stator winding 4. It can be evenly distributed along the circumference of the oil-drawing mechanism 3, and the interval angle between two adjacent self-excited sweeping nozzles 7 is 20°, etc.

[0024] In the self-excited sweeping oil injection cooling structure disclosed in this invention, each self-excited sweeping nozzle 7 is integrated into the inner circumference of the oil priming mechanism 3 and connected to each corresponding oil priming through hole. This achieves the structural integration and processing of multiple self-excited sweeping nozzles 7 with the motor housing 1 in a limited space, so that the cooling oil can cover the stator winding 4 area more evenly, further improving the heat dissipation capacity of the motor.

[0025] To ensure uniform oil intake, an oil intake gap is provided between the oil intake mechanism 3 and the motor housing 1. The oil intake gap is closed and extends circumferentially along the oil intake mechanism 3, and is connected to the oil intake end of each oil intake hole.

[0026] The motor housing 1 is equipped with an oil inlet pipe 5 that is connected to the oil inlet spacer, which is used to input cooling oil into the motor housing 1.

[0027] In one embodiment, two baffles 14 are provided on the inner peripheral wall of the oil-drawing mechanism 3. The baffles 14 block the oil-drawing mechanism 3 and the corresponding stator winding 4 radially, and the two baffles 14 are respectively arranged at both ends of the positions of all self-excited sweeping nozzles 7. By providing the two baffles 14, the respective self-excited sweeping nozzles 7 are included in the range contained by the two baffles 14, thereby blocking the cooling oil. After the cooling oil is sprayed out from the self-excited sweeping nozzles 7, it passes through the gap of its corresponding stator winding 4, enters the range surrounded by each stator winding 4, and is discharged from the gap of the stator winding 4 not included by the two baffles 14, forming a cooling oil flow path.

[0028] Furthermore, to ensure effective guidance of the cooling oil, the inner circumferential wall of the oil-drawing mechanism 3 has a closed structure and surrounds the outer circumference of all stator windings 4. The oil-drawing mechanism 3 has an oil outlet hole 11, which is located circumferentially around the side of both baffles 14 away from the self-excited sweeping nozzle 7. An oil outlet pipe 6, connected to the oil outlet hole 11, is inserted into the motor housing 1 for the cooling oil to be output from inside the motor housing 1.

[0029] Based on the above embodiments, the oil priming interval and each of the sweeping nozzles 7 are located at the upper position inside the motor housing 1, and the oil outlet hole 11 is located at the lower position inside the motor housing 1. Preferably, the oil outlet hole 11 is located at the lowest point of the oil priming mechanism 3. After the cooling oil is sprayed through the gap between each stator winding 4 through the sweeping nozzles 7, it falls down under its own weight and finally gathers at the oil outlet hole 11 and is discharged through the oil outlet pipe 6.

[0030] To ensure convenient oil dispensing, the oil outlet hole 11 is coaxially arranged with the oil outlet pipe 6.

[0031] In one embodiment, the oil extraction mechanism 3 has an oil outlet groove 12 on the side near the stator winding 4, and the oil outlet through hole 11 is opened at the bottom of the oil outlet groove 12.

[0032] To ensure effective return and recovery of cooling oil during the oil injection cooling process, the diameter of the oil outlet through hole 11 should be no less than 3mm, and the depth of the oil outlet groove 12 should be no less than 1mm.

[0033] In one embodiment, the oil guiding mechanism 3 includes an oil guiding ring 8 and an oil guiding arc plate 9. The oil guiding ring 8 is used to surround the outer periphery of all the stator windings 4. The baffle plate 14 and the self-excited sweeping nozzle 7 are both disposed on the inner periphery of the oil guiding ring 8. The oil guiding ring 8 is provided with a plurality of mounting holes 10 that correspond one-to-one with the respective self-excited sweeping nozzles 7. The oil guiding arc plate 9 is installed on the side of the oil guiding ring 8 away from the stator windings 4 and is provided with a plurality of oil delivery holes 13, each oil delivery hole 13 corresponding to each mounting hole 10.

[0034] To ensure smooth oil flow, the axes of the oil inlet 13, the mounting hole 10, and the self-excited sweeping nozzle 7 are all aligned. Furthermore, the diameter of each mounting hole 10 and each oil inlet 13 is 1.5 mm.

[0035] Based on the above implementation, the radial cross section of the oil-drawing arc plate 9 is convex, and the side of it close to the oil-guide ring 8 protrudes towards the oil-guide ring 8. Thus, a drainage groove is provided on the side of the oil-drawing arc plate 9 away from the oil-guide ring 8. The oil-drawing arc plate 9 is installed on the motor housing 1, and an oil-drawing interval is formed between it and the motor housing 1 through the drainage groove.

[0036] Each oil delivery hole 13 is located on the bottom of the diversion channel.

[0037] Furthermore, in the specific manufacturing process, the oil guide ring 8 and the oil-drawing arc plate 9 are processed separately and then fixed together to form a complete oil-drawing mechanism 3.

[0038] In one embodiment, the span between the two self-excited sweeping nozzles 7 is at least half the structure of the oil-drawing mechanism 3 to ensure that the pressure and flow rate at the inlet of the multiple self-excited sweeping nozzles 7 are consistent and that there is a good cooling effect. It should be noted that the rotation angle of the structure on the oil-drawing mechanism 3 where each self-excited sweeping nozzle 7 is located is preferably 180 to 240 degrees. Since the oil-drawing arc plate 9 has multiple oil delivery holes 13 corresponding to each self-excited sweeping nozzle 7, with the oil delivery holes 13 at both ends located at the two ends of the oil-drawing arc plate 9, the rotation angle of the entire oil-drawing arc plate 9 is 180 to 240 degrees.

[0039] The working principle of the entire self-excited sweeping oil injection cooling structure is as follows: Cooling oil is delivered to the motor housing 1 via the oil inlet pipe 5 and enters the internal cooling circuit of the motor. Under the constraint of the guide groove, the cooling oil is circumferentially distributed, then flows through the oil delivery hole 13 on the guide groove to the guide ring 8, and then evenly flows into the internal flow channel of the self-excited sweeping nozzle 7 through the mounting hole 10. As it flows through the oscillation chamber of the self-excited sweeping nozzle 7, the cooling oil is fully atomized due to the oscillation effect generated by the flow channel structure. The atomized oil droplets are sprayed in a ring-shaped spray pattern onto the stator winding 4. The atomized oil droplets can evenly cover the ends of the stator winding 4 and the surface of the stator core 2. Through convective heat transfer, the heat generated by the motor operation is transferred to the cooling oil, greatly improving the uniformity of the cooling oil spray coverage and reducing the generation of local hot spots. The cooling oil that has completed the initial heat exchange flows down along the gap of the stator winding 4 and the inner wall of the oil guide ring 8 under the impetus of gravity and subsequent oil flow. Most of the cooling oil is blocked by the baffle plate 14 and flows to the gap of the stator winding 4 to further cool the gap of the stator winding 4 and the inner end of the stator winding 4. Finally, the cooling oil flows down along the gap of the stator winding 4 and the inner wall of the oil guide ring 8 and collects in the oil outlet groove 12 at the lowest point of the structure. Then, the cooling oil is guided through the oil outlet hole 11 and discharged back through the oil outlet pipe 6 on the motor housing 1, thus completing the entire cooling cycle process.

[0040] This invention integrates the self-excited sweeping nozzle 7 into the motor housing 1 within a limited volume, achieving a compact structure while improving the atomization and distribution of cooling oil. This effectively ensures the uniformity of heat dissipation of the stator winding 4, and enables uniform spatial distribution and rapid return of cooling oil. It also ensures that parameters such as nozzle inlet pressure and oscillation frequency remain consistent, thereby improving motor performance and lifespan and ensuring the efficient and stable operation of the motor.

[0041] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0042] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A self-excited sweeping oil injection cooling structure, characterized in that, include: An oil-drawing mechanism is provided between the motor housing and the stator winding, and extends circumferentially along the motor housing; the oil-drawing mechanism has multiple oil-drawing through holes, and the oil-drawing through holes are arranged sequentially along the circumferential direction of the motor housing; The self-excited sweeping nozzles are provided in multiples and are installed circumferentially on the inner circumference of the oil-drawing mechanism and are connected to each of the oil-drawing through holes; the outlet of each self-excited sweeping nozzle is respectively used to face each stator winding gap.

2. The self-excited sweeping oil injection cooling structure according to claim 1, characterized in that, An oil-drawing interval is provided between the oil-drawing mechanism and the motor housing. The oil-drawing interval is closed and extends circumferentially along the oil-drawing mechanism, and is connected to the oil inlet end of each of the oil-drawing through holes.

3. The self-excited sweeping oil injection cooling structure according to claim 2, characterized in that, An oil inlet pipe connected to the oil priming spacer is inserted into the motor housing.

4. The self-excited sweeping oil injection cooling structure according to claim 1, characterized in that, Two baffles are provided on the inner peripheral wall of the oil extraction mechanism. The baffles are radially blocked between the oil extraction mechanism and the corresponding stator winding, and the two baffles are respectively located at both ends of the positions of all the self-excited sweeping nozzles.

5. The self-excited sweeping oil injection cooling structure according to claim 4, characterized in that, The inner peripheral wall of the oil-drawing mechanism has a closed structure and is used to surround the outer peripheral side of all the stator windings.

6. The self-excited sweeping oil injection cooling structure according to claim 5, characterized in that, The oil extraction mechanism is provided with an oil outlet through hole, which is located on the side of both baffles that are away from the self-excited sweeping nozzle along the circumference of the oil extraction mechanism.

7. The self-excited sweeping oil injection cooling structure according to claim 6, characterized in that, An oil outlet pipe connected to the oil outlet hole is inserted into the motor housing.

8. The self-excited sweeping oil injection cooling structure according to claim 6, characterized in that, The oil extraction mechanism has an oil outlet groove on the side near the stator winding, and the oil outlet through hole is located at the bottom of the oil outlet groove.

9. The self-excited sweeping oil injection cooling structure according to claim 8, characterized in that, The oil extraction mechanism includes: An oil guide ring is used to surround the outer periphery of all the stator windings. The baffle plate and the self-excited sweep nozzle are both disposed on the inner peripheral wall of the oil guide ring. The oil guide ring has a plurality of mounting holes that correspond one-to-one with each of the self-excited sweep nozzles. An oil-leading arc plate is installed on the side of the oil guide ring away from the stator winding and has multiple oil delivery holes, each of which is connected to each of the mounting holes.

10. The self-excited sweeping oil injection cooling structure according to claim 1, characterized in that, The span between the two self-excited sweeping nozzles is at least half the length of the oil extraction mechanism.

Images