Stator assembly and electronic water pump comprising same

Abstract

The utility model discloses a stator assembly and an electronic water pump comprising the same. The stator assembly comprises a stator iron core, an upper framework, a lower framework and a cover cap, the upper framework and the lower framework each comprise an annular frame and a plurality of tooth parts extending inwards in the radial direction of the inner surface of the annular frame. A pair of grooves are symmetrically formed in the top of the annular frame and located on the two sides of each tooth part, the depths of the grooves in the two sides of the tooth part where the windings of the same phase are located are the same, the depths of the grooves in the two sides of the tooth part where the windings of different phases are located are different, and the upper framework and the lower framework are inserted into iron core grooves of the stator iron core from the two ends respectively; a gap bridge wire and a leading-out wire of the winding are respectively positioned on the lower framework and the upper framework, and the cover cap covers the upper framework and is provided with three convex bodies for the leading-out wire to pass through. According to the utility model, enamelled wire abrasion caused by mutual intersection of the winding enamelled wires can be avoided, and meanwhile, the bridging wire and the outgoing line are arranged on different frameworks, so that the structure of the frameworks is simplified, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pump design, in particular to a stator assembly and an electronic water pump comprising the same. Background Art

[0002] The energy storage electronic water pump provides circulating power for the coolant used in the thermal management and cooling of energy storage batteries. The stator skeleton is an important part of the motor insulation system, which directly affects the service life and safety of the electronic water pump. In the conventional stator assembly of the prior art, the stator skeleton cannot distinguish different phase windings, resulting in the cross-over wires of different phase windings crossing each other, and the enameled wire is easily damaged, causing inter-turn short circuit. For this reason, the utility model patent with the patent number CN205960827U discloses that three-phase windings are distinguished by three grooves with different depths. However, in this patent, three kinds of grooves are arranged near each stator tooth, and the winding selects one of the grooves to enter and exit. Due to the large number of grooves and the cross-over wires are separated by three bosses with different heights, the skeleton structure is relatively complex, and the winding process is also more difficult. This structure is mainly used in high-voltage motors and is not very useful in low-voltage motors, but it will cause unnecessary cost increase.

[0003] In addition, in the stator assembly of the prior art, the lead wires and cross-over wires of the winding are arranged on the same skeleton and are both close to the circuit board. On the one hand, it will increase the difficulty of the insulation structure design between the skeleton and the circuit board. On the other hand, it will also make the skeleton structure close to the circuit board complex. At this time, if the lower skeleton and the upper skeleton adopt the same structure, the effective utilization rate of the skeleton will be reduced and the cost will be increased. And the existing end insulation structure of the stator assembly cannot fix the lead wires. Therefore, it is necessary to use a pressing plate to press the stator coil in the wire groove at the end of the skeleton (such as the pressing plate described in the patent number CN217904142U).

[0004] In summary, how to design a stator assembly that can simplify the skeleton structure, reduce the winding difficulty and avoid damage to the enameled wire is a technical problem that needs to be solved at present. Summary of the Utility Model

[0005] In order to solve the technical problems of the stator assembly in the electronic water pump of the prior art, such as easy damage to the enameled wire, low effective utilization rate of the skeleton, and high winding difficulty, the utility model provides a stator assembly and an electronic water pump comprising the same to solve the above problems.

[0006] The utility model provides a stator assembly, which includes a stator core, an upper skeleton, a lower skeleton and a cover; both the upper skeleton and the lower skeleton include an annular frame and a plurality of tooth parts extending radially inwards along the inner surface of the annular frame.

[0007] A pair of grooves are symmetrically arranged on both sides of each tooth part at the top of the annular frame. The depths of the grooves on both sides of the tooth parts where the same-phase windings are located are the same, and the depths of the grooves on both sides of the tooth parts where different-phase windings are located are different. The upper skeleton and the lower skeleton are respectively inserted into the core slots of the stator core from both ends; the cross-over wires and lead-out wires of the windings are respectively located on the lower skeleton and the upper skeleton, and the cover is covered outside the upper skeleton, and the cover has three protrusions for the lead-out wires to pass through.

[0008] Further, the annular frame includes a plurality of small retaining platforms and a plurality of large retaining platforms. The small retaining platforms are located between the two grooves on both sides of the same tooth part, and the large retaining platforms are located between two adjacent grooves corresponding to different tooth parts. The arc length of the large retaining platform is greater than the arc length of the small retaining platform.

[0009] Further, the annular frame is provided with a plurality of convex blocks protruding outward, and the cover has notches for clamping with the convex blocks.

[0010] Further, the plurality of convex blocks are arranged non-uniformly in the circumferential direction.

[0011] Further, the cover includes a top plate and an annular extension body. The annular extension body and the protrusions extend to both sides of the top plate respectively, and the notches are located on the annular extension body.

[0012] Further, the aperture of the end of the protrusion connected to the top plate is larger than the aperture of the end far from the top plate.

[0013] Further, a retaining ring is provided on the outer surface of the annular frame, and both ends of the retaining ring are respectively abutted against the end portions of the stator core and the annular extension body.

[0014] Further, the upper skeleton and the lower skeleton have the same structure.

[0015] The present utility model also provides an electronic water pump, which includes a water pump housing, a motor housing, a front end cover, a rear cover, an impeller, a motor and a control board; the motor includes a rotor assembly and the above-mentioned stator assembly, and mounting feet for connecting with a customer mounting surface are arranged at the bottom of the motor housing.

[0016] Further, the mounting feet include two L-shaped mounting plates integrally die-cast with the motor housing. The L-shaped mounting plates have partitions connected to the motor housing, and mounting holes are provided on the L-shaped mounting plates on both sides of the partitions.

[0017] Further, the two L-shaped mounting plates are arranged in a V-shaped layout, and the maximum distance D2 between the two L-shaped mounting plates is less than the maximum diameter D1 of the motor housing.

[0018] Further, the water outlet on the water pump housing opens upward, and the water outlet and the mounting feet are installed in opposite directions.

[0019] The beneficial effects of the present utility model are:

[0020] (1) The utility model enables the incoming wire and the outgoing wire of each winding to be in the same plane through the setting of symmetric grooves, and the cross-over wire of the same-phase winding is also located in the same plane, making the winding more convenient, avoiding the abrasion of the enameled wire due to the mutual crossing of the enameled wires of the windings. At the same time, the cross-over wire and the lead wire are arranged on different skeletons, thus simplifying the structure of the skeleton. The amount of enameled wire at the end of the skeleton close to the control board is less, saving costs.

[0021] (2) The annular frames of the upper and lower skeletons of the utility model are composed of a large retaining platform and a small retaining platform. The large retaining platform is used to support the connection wire (i.e., the cross-over wire) between the same windings, ensuring the consistency of the tightness of the enameled wire and avoiding the contact and friction between the wire on the winding and the cross-over wire.

[0022] (3) The protruding body on the cover of the utility model can fix the lead wire, so that the pressure plate can be omitted, and there is no need to press and fix the coil, reducing the volume of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0024] Figure 1 is an exploded view of the specific embodiment of the stator assembly of the present utility model;

[0025] Figure 2 is a perspective view of the upper skeleton or the lower skeleton of the present utility model;

[0026] Figure 3 is a perspective view of the cover of the present utility model;

[0027] Figure 4 is a perspective view of the cover of the present utility model;

[0028] Figure 5 is a schematic diagram of the assembly of the cover and the upper skeleton of the present utility model;

[0029] Figure 6 is an axial sectional view of the electronic water pump of the present utility model;

[0030] Figure 7 is a schematic diagram of the motor housing of the electronic water pump of the present utility model;

[0031] Figure 8 is Figure 7 a side view from the axial end side.

[0032] In the figure, 1 is the stator core, 101 is the core slot, 2 is the upper skeleton, 3 is the lower skeleton, 4 is the cover, 401 is the top plate, 402 is the annular extension, 403 is the protruding body, 5 is the annular frame, 501 is the small retaining platform, 502 is the large retaining platform, 6 is the tooth part, 7 is the first groove, 8 is the second groove, 9 is the third groove, 10 is the relief notch, 11 is the insulator, 12 is the bump, 13 is the notch, 14 is the retaining ring, 15 is the baffle, 16 is the water pump housing, 17 is the motor housing, 18 is the front end cover, 19 is the rear cover, 20 is the impeller, 21 is the motor, 2101 is the stator assembly, 2102 is the rotor assembly, 22 is the control board, 23 is the mounting foot, 24 is the L-shaped mounting plate, 25 is the partition, 26 is the mounting hole, 27 is the water outlet. Detailed implementation mode

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which 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 by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0034] As Figures 1 - 5 shown, a stator assembly includes a stator core 1, an upper skeleton 2, a lower skeleton 3 and a cover 4; both the upper skeleton 2 and the lower skeleton 3 include an annular frame 5 and a plurality of tooth parts 6 radially extending inwards along the inner surface of the annular frame 5.

[0035] A pair of grooves are symmetrically arranged on both sides of each tooth part 6 at the top of the annular frame 5. The depths of the grooves on both sides of the tooth part 6 where the same-phase windings are located are the same, and the depths of the grooves on both sides of the tooth part 6 where different-phase windings are located are different. As Figure 2 shown, the three-phase windings respectively correspond to three grooves with different depths: the first groove 7, the second groove 8 and the third groove 9. The three grooves are arranged in pairs on both sides of the same tooth part 6. In this way, it can be ensured that the connection lines (i.e., the jumper wires) between the windings on the same phase can be kept on the same horizontal plane in the circumferential direction, that is, the connection lines of the windings of each phase are parallel to each other, so they do not cross each other. Without increasing the axial dimension of the stator assembly 2101 as much as possible, the breakage of the enameled wire caused by crossing is avoided. Since the outside of the annular frame 5 is smooth and there is no shielding structure, the winding is more convenient and can also meet the winding requirements of the electronic water pump.

[0036] The upper skeleton 2 and the lower skeleton 3 are respectively inserted into the core slots 101 of the stator core 1 from both ends; the cross-connection wires and the lead wires of the winding are respectively located on the lower skeleton 3 and the upper skeleton 2. The cross-connection wires are the connection wires between the windings and are wound around the outside of the annular frame 5. Arranging the lead wires and the cross-connection wires on the upper and lower skeletons 3 respectively can simplify the structure of the upper skeleton 2 and also reduce the amount of enameled wire on the upper skeleton 2. The cross-connection wires are located on the lower skeleton 3 and are at a relatively far distance from the control board 22 of the electronic water pump, thereby reducing the insulation and sealing requirements of the cover 4. The cover 4 mainly blocks the windings on the end face of the upper skeleton 2.

[0037] The cover 4 covers the outside of the upper skeleton 2, and there are three protrusions 403 on the cover 4 for the lead wires to pass through.

[0038] Specifically, the annular frame 5 includes a plurality of small retaining platforms 501 and a plurality of large retaining platforms 502. The small retaining platforms 501 are located between two grooves on both sides of the same tooth part 6, and the large retaining platforms 502 are located between two adjacent grooves corresponding to different tooth parts 6. The arc length of the large retaining platform 502 is greater than the arc length of the small retaining platform 501. As Figure 2 shown, a small retaining platform 501 is arranged between two adjacent first grooves 7, and a large retaining platform 502 is arranged between the adjacent first groove 7 and the third groove 9. The small retaining platform 501 is located on the radial outer side of the tooth part 6 and is used to prevent the coil from crossing over the small retaining platform 501 and causing electric leakage of the water pump housing 16 due to contact with the motor housing 17. The large retaining platform 502 is used to support the connection wires between the windings of the same phase during the use of the lower skeleton 3. The connection wires between the windings of the same phase need to cross the intermediate winding slot. Therefore, during the process of crossing the slot, the connection wires need to be along the outer circumference of the large retaining platform 502, so as to ensure that the connection wires do not go straight across the top surface of the enameled wire in the slot during the slot crossing (because there is a large tension on the wire during winding, and it will definitely go in a straight line distance without external interference). This can not only ensure that the enameled wires between different winding slots have the same tightness during the winding process, but also prevent the connection wires between the windings from crossing over the large retaining platform 502 under the action of the tension of the winding machine and passing over the coil, thereby generating friction between the wire on the coil and the connection wire and causing damage to the enameled wire.

[0039] It is preferable that the structures of the upper and lower skeletons 3 are the same. Corresponding to the above embodiment, that is, a large retaining platform 502 is also arranged on the upper skeleton 2, so that the same set of molds can be used to save the mold cost.

[0040] As Figure 2As shown in the figure, there are multiple insulators 11 below the annular frame 5. The insulators 11 are inserted into the stator slots to isolate the current conduction between the winding and the stator core 1, preventing the electricity on the winding from being conducted through the stator core 1 into the motor housing 17 and affecting the safe use of the water pump. The insulators 11 of the upper skeleton 2 and the lower skeleton 3 do not need to be sleeved with each other, and can be positioned by the cooperation of the positioning posts at the ends of the upper skeleton 2 and the lower skeleton 3 with the stator core 1. Corresponding positioning holes are provided on the stator core 1, and the specific positions of the positioning posts and the positioning holes are not shown in the figure.

[0041] The upper skeleton 2 is fixed to the cover 4:

[0042] The annular frame 5 is provided with several convex blocks 12 protruding outward. The cover 4 has a notch 13 for clamping with the convex blocks 12. The convex blocks 12 are preferably arranged non-uniformly along the circumferential direction, so as to achieve anti-fooling design and avoid misassembly. As Figure 2 described, there are five convex blocks 12 on the annular frame 5. Four of the convex blocks 12 are divided into two groups, each group is symmetric with respect to one tooth part 6, and the remaining one convex block 12 is independently arranged to play an anti-fooling role. The number of notches 13 on the cover 4 for clamping with the convex platforms can be less than the number of convex platforms. As Figure 3 and Figure 4 described, there are three notches 13 for clamping with the convex platforms. Two of the notches 13 are provided with relief notches 10 to make way for the unassembled convex platforms (as Figure 5 shown).

[0043] Since the lead wires and the cross-connection wires are distributed on different skeletons, the axial length of the upper skeleton 2 can be reduced, and the same structure of the upper and lower skeletons 3 will not cause an increase in the volume of the motor 21. Moreover, after the upper and lower skeletons 3 are assembled, there is no need for an overlapping part, the structure is simple, the assembly is convenient, the mold structure is simple, and the cost is low.

[0044] Cover 4:

[0045] The cover 4 includes a top plate 401 and an annular extension 402. The annular extension 402 and the protruding body 403 extend to both sides of the top plate 401 respectively, and the notch 13 is located on the annular extension 402. During installation, the annular extension 402 extends towards the upper skeleton 2, and the protruding body 403 extends in the opposite direction for leading out the three-phase lead wires.

[0046] To ensure the complete isolation of the enameled wire from the motor housing 17, preferably, a retaining ring 14 is provided on the outer surface of the annular frame 5. The two ends of the retaining ring 14 are respectively abutted against the end of the stator core 1 and the end of the annular extension 402. At this time, the cover 4 wraps the end and the outer side of the upper part of the upper skeleton 2, making electrical isolation for the winding end and the inner baffle 15 of the motor housing 17, and ensuring the safe use of the water pump.

[0047] In another embodiment of the present utility model, the cover 4 not only has the function of insulating protection, but also has the function of fixing the lead wires. Specifically, the aperture of the end of the protruding body 403 connected to the top plate 401 is larger than that of the end far from the top plate 401.

[0048] As Figure 4 shown, the protruding body 403 is in the shape of a large bottom and a small top. The large bottom facilitates the insertion of the winding lead wires; the small top is for more firmly fixing the lead wires.

[0049] Each phase winding has only two winding heads. After connecting the winding heads of each phase in a certain order, three-phase winding lead wires are formed. The winding lead wires respectively extend into the protruding body 403 of the cover 4. The protruding body 403 of the cover 4 has a fixing effect on the position of the lead wires. The lead wires and the protruding body 403 together pass through the baffle 15 on the motor housing 17 (the baffle 15 between the cavity of the motor 21 and the cavity of the control board 22), ensuring the accurate alignment of the connection ports on the lead wires and the control board 22, and thus ensuring the effective electrical connection between the lead wires and the control board 22.

[0050] At the same time, the protruding body 403 on the cover 4 also has the function of insulating between the lead wires and the motor housing 17, preventing the electricity on the winding from passing through the motor housing 17 and affecting the use safety of the water pump.

[0051] In the traditional structure, the cover 4 cannot fix the lead wires, and a wire pressing structure needs to be set on the cover 4 to press the coil in the wire groove to prevent the lead wires from detaching from the outlet of the cover 4. In the present utility model, since the cover 4 can fix the lead wires, the wire pressing structure extending into the wire groove can be omitted, so the space size of the wire groove can be reduced, and further the radial size of the stator assembly 2101 can be reduced.

[0052] The present utility model also proposes an electronic water pump, as Figure 6 shown, including a water pump housing 16, a motor housing 17, a front end cover 18, a rear cover 19, an impeller 20, a motor 21 and a control board 22; the motor 21 includes a rotor assembly 2102 and the stator assembly 2101 described above. Mounting feet 23 for connecting to the customer installation surface are provided at the bottom of the motor housing 17.

[0053] The motor housing 17 is divided into a motor cavity and a controller cavity by a baffle 15. The front end of the motor housing 17 has a front cover 18, and the rear end has a rear cover 19. The motor housing 17 is cooperatively installed with the front cover 18, the water pump housing 16, and the rear cover 19. Inside the motor housing 17 is the motor 21. The upper skeleton 2 and the lower skeleton 3 are simultaneously sleeved on the stator core 1. The insulator 11 is inserted into the core slot 101. The skeleton wraps the two end faces of the inside of the core slot 101 and the stator core 1. The enameled wire is wound around the skeleton. After the enameled wire is energized, the skeleton insulates the live body (enameled wire) and the conductor (stator core 1), preventing the current from being conducted to the motor housing 17 through the stator core 1 and avoiding potential safety hazards for customers during use.

[0054] One end of the stator assembly 2101 has a winding lead wire. After the lead wire passes through the three protrusions 403 of the cover 4, it is necessary to achieve electrical connection with the control board 22.

[0055] As Figure 7 shown, the mounting feet 23 include two L-shaped mounting plates 24. The two L-shaped mounting plates 24 are preferably integrally die-cast with the motor housing 17, which can not only save the cost of the water pump but also reduce the production process; at the same time, the situation of the housing rotting will not occur. The L-shaped mounting plate 24 has a partition 25 connected to the motor housing 17, and mounting holes 26 are provided on the L-shaped mounting plates 24 on both sides of the partition 25. The top end of the L-shaped mounting plate 24 is connected to the motor housing 17, and the bottom end is tightly fitted with the customer's mounting surface. The mounting holes 26 are used to assemble screws, facilitating the locking of the mounting feet 23 to the customer's mounting surface through screws. The partition 25 plays a supporting role for the motor housing 17 and also increases the strength of the mounting feet 23, thereby enhancing the firmness of the water pump after installation.

[0056] The two L-shaped mounting plates 24 are placed back to back, and the inner sides are in a "V" shape, which can increase the contact area between the mounting feet 23 and the motor housing 17 and the strength of the mounting feet 23. As Figure 8 shown, the maximum distance D2 between the two L-shaped mounting plates 24 is less than the maximum diameter D1 of the motor housing 17. This saves both materials and installation space, meeting the needs of customers with limited installation space.

[0057] In a further design, the water outlet 27 on the water pump housing 16 opens upward, and the water outlet and the mounting feet 23 are installed in opposite directions. As Figure 6 shown, when the water pump housing 16 is used as a reference, the mounting feet 23 are located at the bottom of the motor housing 17. The position direction of the water outlet 27 is opposite to that of the mounting feet 23, and the mounting feet 23 and the water outlet 27 are respectively located below and above the water pump housing 16. The mounting feet 23 and the water outlet 27 are radially aligned, saving the space occupied by the installation on both the left and right sides of the water outlet 27.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "length", "upper", "lower", "left", "right", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0059] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a number of" is two or more.

[0060] In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments.

[0061] Taking the above-mentioned ideal embodiment of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stator assembly, characterized in that: It includes a stator core, an upper frame, a lower frame and a cover; the upper frame and the lower frame each include an annular frame and a plurality of teeth extending radially inwardly along the inner surface of the annular frame; A pair of grooves are symmetrically provided at the top of the annular frame and on both sides of each tooth portion. The grooves on both sides of the tooth portion where the same phase winding is located have the same depth, and the grooves on both sides of the tooth portion where different phase windings are located have different depths. The upper frame and the lower frame are respectively inserted into the core slots of the stator core from both ends; the bridge wire and the lead wire of the winding are respectively located on the lower frame and the upper frame, and the cover is covered outside the upper frame, and the cover has three protrusions for the lead wires to pass through.

2. The stator assembly according to claim 1, characterized in that: The annular frame includes a plurality of small stops and a plurality of large stops. The small stops are located between two grooves on both sides of the same tooth portion, and the large stops are located between two adjacent grooves corresponding to different tooth portions. The arc length of the large stops is greater than the arc length of the small stops.

3. The stator assembly according to claim 1, characterized in that: The annular frame is provided with a plurality of protrusions protruding outward, and the cover has notches engaged with the protrusions.

4. The stator assembly according to claim 3, characterized in that: The plurality of protrusions are arranged non-uniformly along the circumferential direction.

5. The stator assembly according to claim 3, characterized in that: The cover comprises a top plate and an annular extension body, wherein the annular extension body and the protruding body extend to two sides of the top plate respectively, and the notch is located on the annular extension body.

6. The stator assembly according to claim 5, characterized in that: The hole diameter of one end of the protrusion connected to the top plate is larger than the hole diameter of the end away from the top plate.

7. The stator assembly according to claim 5, characterized in that: A retaining ring is provided on the outer surface of the annular frame, and two ends of the retaining ring are respectively in contact with the ends of the stator core and the annular extension body.

8. The stator assembly according to any one of claims 1 to 7, characterized in that: The upper frame and the lower frame have the same structure.

9. An electronic water pump, characterized in that: It comprises a water pump housing, a motor housing, a front cover, a rear cover, an impeller, a motor and a control panel; the motor comprises a rotor assembly and a stator assembly as claimed in any one of claims 1 to 8, and a mounting foot connected to a customer mounting surface is provided at the bottom of the motor housing.

10. The electronic water pump according to claim 9, characterized in that: The mounting foot comprises two L-shaped mounting plates integrally die-cast with the motor housing, the L-shaped mounting plates are provided with partitions connected with the motor housing, and the L-shaped mounting plates located on both sides of the partitions are provided with mounting holes.

11. The electronic water pump according to claim 10, characterized in that: The two L-shaped mounting plates are arranged in an eight-shaped shape, and the maximum distance D2 between the two L-shaped mounting plates is smaller than the maximum diameter D1 of the motor housing.

12. The electronic water pump according to claim 9, characterized in that: The water outlet opening on the water pump housing faces upward, and the water outlet and the mounting foot are installed in opposite directions.

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