A shower ring structure for cooling three-phase and winding

Abstract

The utility model discloses a kind of oil shower ring structures of cooling three-phase and winding, it is related to drive motor technical field, including oil shower ring;Oil shower ring is located between iron core end face and open, it is around and set in winding outlet end and three-phase copper bar outside, its front end and iron core end face sealing contact connection, rear end and shell sealing contact connection, and with rear end cover axial and circumferential contact limit;Oil shower ring and shell and the cavity formed between iron core end face, and the oil channel is communicated with cooling oil by being set on iron core;Oil shower ring is respectively in the arc region above and both sides corresponding on winding and three-phase copper bar and densely set up oil injection hole and oil hole, and bottom oil injection hole is set in the bottom of oil shower ring.The utility model optimizes the structure of oil shower ring, forms the cavity that can be oil injection cooling to stator winding and three-phase copper bar between shell, oil shower ring and stator, without separately setting the cooling structure of three-phase copper bar, space utilization is high, beneficial to the promotion of motor power.

Description

Technical Field

[0001] This utility model relates to the field of drive motor technology, specifically to an oil-drenching ring structure for cooling the three phases and windings of a new energy oil-cooled drive motor. Background Technology

[0002] The operating temperature of the drive motor in new energy vehicles directly affects its performance and the insulation properties of the stator and insulation materials. The temperature rise of the drive motor is essentially the difference between its operating temperature and the ambient temperature, primarily caused by the increase in stator and rotor temperatures. The stator temperature rise is mainly due to stator copper losses (losses generated by heat due to the resistance of the copper wires when current flows through the windings) and iron losses (hysteresis and eddy current losses in the stator core). The rotor temperature rise is mainly due to its iron losses (hysteresis and eddy current losses in the rotor core).

[0003] To dissipate the heat generated by copper and iron losses, a corresponding cooling structure is installed inside the drive motor.

[0004] Based on existing technology searches, the following known technical solutions exist:

[0005] Prior Art 1: A Cooling Structure for Oil Injection Rings of Motor Stator Windings

[0006] Application number: CN202321289013.6, application date: 2023.05.25, publication (announcement) date: 2023.10.24.

[0007] Prior art 1 discloses a cooling structure for an oil injection ring of a motor stator winding. The oil injection ring has a first groove and a second groove at its axial ends, respectively. A first skeleton is provided on the circumferential surface of the oil injection ring near the first groove. Multiple spiral fins with opposite rotation directions are also provided on the circumferential surface of the oil injection ring, and an oil injection hole is provided between two spiral fins. The stator silicon steel sheet is located inside the electrical housing, and the stator silicon steel sheet abuts against the axial end of the oil injection ring with the second groove. The axial end of the oil injection ring with the first groove abuts against the extension surface of the first step, and the first skeleton of the oil injection ring abuts against the extension surface of the second step. An oil passage cavity is formed between the oil injection ring and the inner wall of the electrical housing. The oil injection hole communicates with the oil passage cavity. Several notches are provided at the axial end of the stator silicon steel sheet, and the notches communicate with the oil passage cavity. This invention has a simple structure and provides better cooling for the motor stator winding.

[0008] Prior art 2: An oil injection ring for spraying stators with a function of distributing cooling oil volume

[0009] Application number: CN202410134893.2, application date: 2024.01.30, publication (announcement) date: 2024.05.14.

[0010] Prior art 2 relates to the field of motor cooling technology, and in particular to an oil spraying ring for spraying a stator with a function of distributing cooling oil. The ring includes a retaining part, an extrusion member, a cooling oil separator, and an oil spraying part. The retaining part is annular, and the extrusion member is disposed on the retaining part, specifically at the end of the retaining part near the motor end cover when the oil spraying ring is installed. The cooling oil separator and the oil spraying part are disposed radially inward on the retaining part, and are close to the end face of the motor stator core when the oil spraying ring is installed. The cooling oil separator evenly divides the oil spraying part into multiple spray grids, each with multiple spray holes. In this application, the cooling oil separator divides the oil spraying part into multiple equal spray grids, allowing the coolant to be quantitatively distributed into the spray grids and then sprayed out through the multiple spray holes within the spray grids. This makes the distribution of cooling oil more scientific, improving the cooling effect of the cooling oil on the motor and thus increasing the motor's power.

[0011] However, both existing technologies 1 and 2 only have the function of cooling the windings and cannot cool the three-phase copper busbars. The heat dissipation of the copper busbars relies on natural cooling. With the increasing requirements of practical applications, the problem of excessive three-phase temperature rise in motors has gradually become prominent. High temperature can easily cause the insulation of the insulating plastic covering the three-phase copper busbars to fail, becoming an important factor limiting the improvement of motor power.

[0012] The above search results show that the above technical solutions do not affect the novelty of this utility model; and the combination of the above prior art does not destroy the inventiveness of this utility model. Utility Model Content

[0013] This invention aims to overcome the shortcomings of the prior art by providing an oil-drenching ring structure for cooling three phases and windings.

[0014] The present invention adopts the following technical solution to solve the technical problem: an oil-drenching ring structure for cooling three phases and windings, the shell is a hollow structure with a cavity, the left end of which is open and fitted with a rear end cover, the stator is accommodated in the cavity, including an iron core, windings and three-phase copper busbars, the ends of the windings and the iron core facing the open end are respectively the winding lead-out end and the iron core end face, including an oil-drenching ring;

[0015] The oil-spraying ring is located between the iron core end face and the opening, surrounding the winding output end and the three-phase copper busbar. Its front end is in sealed contact with the iron core end face, its rear end is in sealed contact with the housing, and it is axially and circumferentially contacted and limited by the rear end cover.

[0016] The oil-spraying ring forms a receiving cavity with the housing and the end face of the iron core, and the receiving cavity is connected to the cooling oil through the oil passage provided on the iron core;

[0017] Oil spraying ring has oil spraying holes and oil holes densely distributed in the arc-shaped areas above and on both sides of the winding and the three-phase copper busbar, respectively, for spraying oil onto the stator winding and the three-phase copper busbar; and bottom oil spraying holes are opened at the bottom of the oil spraying ring.

[0018] Furthermore, the front part of the oil-spraying ring has a full-circumference annular structure, and the rear part has an arc-shaped plate structure corresponding to the area where the three-phase copper busbar is set.

[0019] The rear ends of the full-circumferential annular structure and the arc-shaped plate structure respectively bulge outward to form an outer circular surface and a rib, and the oil-spraying ring is sealed and connected to the shell through the outer circular surface and the rib.

[0020] Furthermore, the outer circular surface and the convex rib are connected to form a continuous strip structure, and a stop is opened in the shell corresponding to the strip structure;

[0021] The outer circular surface and the convex rib engage with the stop to seal and connect the housing to the oil-spraying ring.

[0022] Furthermore, both the outer circular surface and the raised rib are interference-fitted with the housing to achieve a radial seal between the oil-spraying ring and the housing.

[0023] Furthermore, axial limiting blocks are evenly distributed in the area outside the arc-shaped plate structure at the rear of the oil-spraying ring;

[0024] The axial limiting block makes axial contact with the rear end cover to limit the axial movement of the oil-spraying ring.

[0025] Furthermore, a radially protruding circumferential limiting block is provided on the outer side of the axial limiting block corresponding to the position of the rear end cover;

[0026] The circumferential limiting block contacts and limits the oil spray ring circumferentially.

[0027] Furthermore, it also includes sealing rings;

[0028] The front end of the oil-spraying ring is sealed and connected by a sealing ring that is installed in conjunction with the oil-spraying ring and the stator.

[0029] Furthermore, within the circumferential region corresponding to the arc-shaped plate structure within the accommodating cavity, flow-blocking ribs are evenly distributed, with the ribs arranged axially. This is used to improve the distribution of cooling oil within the accommodating cavity, thereby improving the uniformity of oil spraying from the oil-spraying ring and optimizing the cooling effect.

[0030] Furthermore, the injection holes and the oil holes are evenly distributed.

[0031] This invention provides an oil-drenching ring structure for cooling three-phase windings, which has the following beneficial effects:

[0032] 1. This utility model optimizes the structure of the oil spraying ring, forming a cavity between the housing, the oil spraying ring and the stator that can spray oil to cool the stator winding and the three-phase copper busbar. There is no need to set up a separate cooling structure for the three-phase copper busbar, which has high space utilization and is conducive to the improvement of motor power.

[0033] 2. This utility model achieves radial sealing of the rear end of the oil-spraying ring by fitting the outer circular surface and the rib with the inner stop of the housing. Only one sealing ring for axial sealing needs to be set at the front end of the oil-spraying ring to seal the oil-spraying ring. Compared with the conventional structure, one radial sealing ring is reduced, which is beneficial to the control of equipment costs.

[0034] 3. The size and number of the oil injection holes and oil holes of this utility model can be adjusted and set according to the actual situation, which can better adapt to the cooling needs of different drive motors (such as drive motors with different housing sizes). Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the oil-spraying ring of this utility model.

[0037] In the picture:

[0038] 1. Housing; 2. Stator; 3. Oil-drenching ring; 4. Winding lead-out end; 5. Three-phase copper busbar; 6. Opening; 7. Sealing ring; 8. Oil hole; 9. Receiving cavity; 10. Oil spray hole; 11. Outer circular surface; 12. Raised rib; 13. Flow-blocking rib; 14. Iron core end face; 15. Stop; 18. Rear end cover; 19. Axial limiting block; 20. Circumferential limiting block. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] An oil-drenching ring structure for cooling three-phase windings, such as Figures 1-2 As shown, its structural relationship is as follows: the shell 1 has a hollow structure with a cavity, and its left end opening 6 is fitted with a rear end cover 18. The stator 2 is accommodated in the cavity and includes an iron core, windings and three-phase copper busbars 5. The ends of the windings and the iron core facing the opening 6 are the winding output end 4 and the iron core end face 14, respectively, including an oil-drenching ring 3.

[0041] The oil-spraying ring 3 is located between the iron core end face 14 and the opening 6, and is arranged around the winding output end 4 and the three-phase copper bus 5. Its front end is sealed and connected to the iron core end face 14, and its rear end is sealed and connected to the housing 1, and is axially and circumferentially contacted and limited by the rear end cover 18.

[0042] An accommodating cavity 9 is formed between the oil-spraying ring 3, the housing 1, and the iron core end face 14. The accommodating cavity 9 is connected to the cooling oil through the oil passage provided on the iron core.

[0043] Oil spraying ring 3 has oil spraying holes 10 and oil holes 8 densely arranged in the corresponding arc-shaped areas above and on both sides of the winding and the three-phase copper busbar 5, respectively, for spraying oil onto the stator winding 4 and the three-phase copper busbar 5; and bottom oil spraying hole is opened at the bottom of the oil spraying ring 3.

[0044] Preferably, the front part of the oil-spraying ring 3 has a full-circumference annular structure, and the rear part corresponding to the area where the three-phase copper busbar 5 is set has an arc-shaped plate structure.

[0045] The rear ends of the full-circle annular structure and the arc-shaped plate structure are radially protruding to form an outer circular surface 11 and a rib 12, respectively, and the oil-spraying ring 3 is sealed and connected to the shell 1 through the outer circular surface 11 and the rib 12.

[0046] Preferably, the outer circular surface 11 and the rib 12 are connected in a continuous strip structure, and a stop 15 is opened in the shell 1 corresponding to the strip structure;

[0047] The outer circular surface 11 and the raised rib 12 engage with the stop 15 to seal and connect the housing 1 with the oil-spraying ring 3.

[0048] Preferably, both the outer circular surface 11 and the raised rib 12 are interference-fitted with the housing 1 to achieve radial sealing between the oil-spraying ring 3 and the housing 1.

[0049] Preferably, axial limiting blocks 19 are evenly distributed in the area outside the arc-shaped plate structure at the rear of the oil-spraying ring 3;

[0050] The axial limiting block 19 makes axial contact with the rear end cover 18 to limit the axial movement of the oil-spraying ring 3.

[0051] Preferably, the axial limiting block 19 corresponding to the position of the rear cover 18 is provided with a radially protruding circumferential limiting block 20 on its outer side;

[0052] The circumferential limiting block 20 makes circumferential contact with the rear end cover 18 to limit the oil spraying ring 3.

[0053] Preferably, it also includes a sealing ring 7;

[0054] The front end of the oil-spraying ring 3 is sealed and connected by a sealing ring 7 that mates with the oil-spraying ring 3 and the stator 2.

[0055] Preferably, within the circumferential region corresponding to the arc-shaped plate structure inside the accommodating cavity 9, flow-blocking ribs 13 are evenly distributed, with the flow-blocking ribs 13 arranged axially. This is used to improve the distribution of cooling oil within the accommodating cavity 9, thereby improving the uniformity of oil spraying from the oil-spraying ring and optimizing the cooling effect.

[0056] Preferably, the oil injection holes 10 and oil holes 8 are evenly distributed.

[0057] When the drive motor is running, the cooling oil enters the accommodating cavity 9 through the oil passages set on the iron core, and is distributed relatively evenly throughout the accommodating cavity 9 under the guidance of pressure and the flow-blocking ribs 13. It is sprayed out through the oil injection holes 10 and oil holes 8 to cool the stator winding 4 and the three-phase copper busbar 5. Then, it falls back under the action of gravity and flows back to the oil pump for circulation.

[0058] like Figure 1 As shown, A and B are schematic diagrams of the cooling oil spray path for cooling the winding and the cooling oil spray path for cooling the three-phase copper busbar, respectively.

[0059] When the drive motor stops, the cooling oil in the accommodating cavity 9 falls to the bottom oil spray hole and is discharged to avoid the accumulation of cooling oil.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cooling ring structure for three phases and windings, wherein the housing (1) is a hollow structure with a cavity, the left end of which is open (6) and fitted with a rear end cover (18), the stator (2) is housed in the cavity, and includes an iron core, windings and three-phase copper busbars (5), wherein the ends of the windings and the iron core facing the open (6) are respectively the winding lead-out end (4) and the iron core end face (14), characterized in that: Including the oil-spraying ring (3); The oil-spraying ring (3) is located between the iron core end face (14) and the opening (6), and is arranged around the winding output end (4) and the three-phase copper busbar (5). Its front end is sealed and connected to the iron core end face (14), its rear end is sealed and connected to the housing (1), and it is axially and circumferentially contacted and limited by the rear end cover (18). The oil-drenching ring (3) forms a receiving cavity (9) between the housing (1) and the iron core end face (14), and the receiving cavity (9) is connected to the cooling oil through the oil passage provided on the iron core; Oil spraying holes (10) and oil holes (8) are densely distributed on the oil spraying ring (3) above and on both sides of the winding and the three-phase copper busbar (5) in the corresponding arc-shaped areas, and a bottom oil spraying hole is opened at the bottom of the oil spraying ring (3).

2. The oil-drenching ring structure for cooling three phases and windings according to claim 1, characterized in that: The front part of the oil-spraying ring (3) has a full-circumference ring structure, and the rear part has an arc-shaped plate structure corresponding to the setting area of ​​the three-phase copper busbar (5). The rear ends of the full-circle annular structure and the arc-shaped plate structure respectively bulge outward to form an outer circular surface (11) and a rib (12), and the oil-spraying ring (3) is sealed and connected to the shell (1) through the outer circular surface (11) and the rib (12).

3. The oil-drenching ring structure for cooling three phases and windings according to claim 2, characterized in that: The outer circular surface (11) and the convex rib (12) are connected to form a continuous strip structure, and a stop (15) is opened in the shell (1) corresponding to the strip structure. The outer circular surface (11) and the convex rib (12) engage with the stop (15) to seal and connect the housing (1) with the oil-spraying ring (3).

4. The oil-drenching ring structure for cooling three phases and windings according to claim 3, characterized in that: The outer circular surface (11) and the convex rib (12) are both interference-fitted to the shell (1).

5. The oil-drenching ring structure for cooling three phases and windings according to claim 2, characterized in that: Axial limiting blocks (19) are evenly distributed in the area outside the arc-shaped plate structure at the rear of the oil-spraying ring (3). The axial limiting block (19) makes axial contact with the rear end cover (18) for limiting.

6. The oil-drenching ring structure for cooling three-phase windings according to claim 5, characterized in that: A radially protruding circumferential limiting block (20) is provided on the outer side of the axial limiting block (19) corresponding to the position of the rear end cover (18). The circumferential limiting block (20) makes circumferential contact with the rear end cover (18) for limiting.

7. The oil-drenching ring structure for cooling three-phase windings according to claim 1, characterized in that: It also includes a sealing ring (7); The front end of the oil-spraying ring (3) is sealed and connected by a sealing ring (7) that is installed in conjunction with the oil-spraying ring (3) and the stator (2).

8. The oil-drenching ring structure for cooling three phases and windings according to claim 2, characterized in that: Within the circumferential region corresponding to the arc-shaped plate structure, the accommodating cavity (9) is provided with evenly distributed flow-blocking ribs (13), which are arranged along the axial direction.

9. The oil-drenching ring structure for cooling three-phase windings according to claim 1, characterized in that: The oil injection holes (10) and the oil holes (8) are evenly distributed.

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