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 core, stator frameworks and insulation paper, the stator frameworks are located at the two ends of the stator core, the stator frameworks comprise an annular outer blocking table and a plurality of inner blocking tables arranged circumferentially, the inner blocking tables are connected with the annular outer blocking table through connecting teeth, and the insulation paper is arranged on the inner blocking tables. A plurality of winding grooves are formed between the inner blocking tables and the annular outer blocking tables, and the inner blocking tables are in corresponding contact with stator teeth of the stator core. The end faces, facing the stator core, of the inner blocking tables are provided with first bosses extending in the stator core direction in the axial direction, the first bosses are flush with the surfaces, facing the winding grooves, of the inner blocking tables, and the end faces, facing the winding grooves, of stator teeth of the stator core and the end faces, facing the winding grooves, of the inner blocking tables are arranged in a radial staggered mode. The insulation paper is clamped between the first boss and the end face, facing the winding grooves, of the stator teeth of the stator core. According to the utility model, the first boss does not occupy the space of the winding groove, so that the groove fullness rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile water pump, especially to a kind of stator assembly and electronic water pump comprising it. BACKGROUND

[0002] The insulation between the stator core and the winding is an important part affecting the safety performance of the electronic water pump. In the prior art, the insulation treatment method between the stator core and the existing coil is: two end faces of the stator core are provided with an insulation skeleton, and insulation paper is installed in the winding slot. The skeleton can not only support the winding, but also play an insulation role between the stator core and the winding. However, during the winding process of the winding machine, the insulation paper is often scraped and deformed by the winding needle, resulting in bending or curling, which causes the insulation paper to be stuck in the coil. Thus, there may be a phenomenon that there is no insulation paper between the core and the winding in some areas, leading to direct contact between the live part (winding) and the conductor (core). The current on the winding is introduced into the stator core, and then transmitted from the stator core to the water pump shell, thereby bringing hidden dangers to the safety of the water pump operation, and even causing safety accidents.

[0003] The prior art is to set two limiting structures protruding into the winding slot on the groove bottom and tooth portion of the skeleton, such as the first stop rib and the second stop rib in patent No. CN112165198A, the slot paper buckle and the slot paper baffle in patent No. CN205544686U, and the first stop portion and the second stop portion in patent No. CN205791879U. The two limiting structures are used to limit the insulation paper at the groove bottom and the slot opening respectively to prevent the insulation paper from curling. Although the limiting structure on the tooth portion is arranged as far as possible at the end of the tooth portion, that is, close to the winding port, for water pumps with high slot fill rate requirements, the winding will be wound to the winding port. At this time, the limiting structure on the tooth portion still occupies the winding space, thereby reducing the slot fill rate.

[0004] In addition, the height of the stator core in the prior art is consistent with the height of the insulation paper. The top edge of the insulation paper, that is, the joint part of the stator core and the tooth portion of the skeleton, is easily exposed due to the slight movement of the insulation paper. Therefore, the winding is easy to contact the stator core at the edge, which has certain safety hazards. UTILITY MODEL CONTENTS

[0005] In order to solve the technical problem of occupying winding slot space and reducing slot fill rate in the anti-deformation design of insulation paper in the stator assembly of the prior art, the utility model provides a stator assembly and an electronic water pump comprising the same to solve the above problems.

[0006] This utility model proposes a stator assembly, including a stator core, a stator frame, and insulating paper. The stator frame is located at both ends of the stator core. The stator frame includes an annular outer baffle and several circumferentially arranged inner baffles. The inner baffles are connected to the annular outer baffles through connecting teeth. Multiple winding grooves are formed between the inner baffles and the annular outer baffles. The inner baffles are in corresponding contact with the stator teeth of the stator core.

[0007] The end face of the inner baffle facing the stator core has a first protrusion extending axially toward the stator core, and the first protrusion is flush with the surface of the inner baffle facing the winding slot. The surface of the stator teeth of the stator core facing the winding slot is radially offset from the surface of the inner baffle facing the winding slot. The insulating paper is stuck between the first protrusion and the surface of the stator teeth of the stator core facing the winding slot.

[0008] In an optional embodiment of this utility model, two adjacent inner baffles are spaced apart to form a winding opening, and the first protrusion is arranged close to the winding opening.

[0009] In an optional embodiment of this utility model, there is an axial gap between the end face of the inner baffle that abuts against the end of the insulating paper and the end face of the stator teeth of the stator core.

[0010] In an optional embodiment of this utility model, the end face of the inner baffle facing the stator core has a raised step, the end faces of the inner baffle located on both sides of the raised step abut against the end of the insulating paper, and the stator teeth of the stator core abut against the raised step.

[0011] In an optional embodiment of this utility model, the surface of the annular outer baffle facing the winding groove has a second protrusion, and the axial end face of the insulating paper abuts against the second protrusion.

[0012] In an optional embodiment of this utility model, the cross-section of the second boss is triangular, the end face of the second boss that abuts against the insulating paper is a plane, and the end face of the second boss that faces away from the insulating paper is an inclined plane.

[0013] In an optional embodiment of this utility model, the annular outer baffle is provided with a plurality of wire inlet slots at one end away from the stator core. The wire inlet slots include a first slot and a second slot arranged in succession, and the inner surface recess depth of the first slot is greater than the inner surface recess depth of the second slot.

[0014] In an optional embodiment of this utility model, the inner side of the first groove is cut into an inclined plane, and the inner side of the second groove is a vertical plane.

[0015] In an optional embodiment of this utility model, the connecting tooth is connected to the raised step, the end face of the connecting tooth facing the stator core and the end face of the raised step facing the stator core are flush, and the axial height of the connecting tooth is less than the axial height of the inner baffle.

[0016] In the optional embodiment of the utility model, the side surface of the inner blocking table towards the annular outer blocking table comprises a first plane and a second plane and a third plane symmetrically arranged on both sides of the first plane and inclinedly arranged with the first plane, and the first boss is located on the second plane and the third plane.

[0017] The utility model discloses still a kind of electronic water pump, including above-mentioned stator subassembly.

[0018] The utility model has the advantages that:

[0019] (1) the first boss of the utility model is arranged in alignment with the inner surface of the inner blocking table, and is arranged in dislocation with the inner surface of stator tooth through the inner blocking table, so that the first boss is pressed on the inner surface of stator tooth in insulating paper, and compared with the radial protruding limiting structure in the prior art, the first boss in the utility model does not occupy the space of winding slot, so as to improve slot fullness.

[0020] (2) the utility model is designed by protruding step on the inner blocking table, so that there is axial gap between the inner blocking table surface on both sides of protruding step and stator tooth, and the end of stator tooth does not adhere to the inner blocking table on the surface of insulating paper shielding the inner surface of stator tooth, so as to avoid that the axial end of insulating paper is curled to cause the contact between winding and the end of stator tooth, and reduce safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model is further illustrated below in connection with drawings and examples.

[0022] Figure 1 It is the perspective view of the stator subassembly of the utility model;

[0023] Figure 2 It is the axial section view of the stator subassembly of the utility model;

[0024] Figure 3 It is another perspective view of the stator subassembly of the utility model;

[0025] Figure 4 It is Figure 3 enlarged view at a in;

[0026] Figure 5 It is Figure 3 enlarged view at b in;

[0027] Figure 6 It is the top perspective view of the stator framework in the utility model;

[0028] Figure 7 It is the bottom perspective view of the stator framework in the utility model;

[0029] Figure 8 It isFigure 7 is an enlarged view of c in FIG.

[0030] Figure 9 is a perspective view of the stator framework in the utility model;

[0031] Figure 10 is Figure 9 is an enlarged view of d in FIG.

[0032] Figure 11 is Figure 9 is an enlarged view of e in FIG.

[0033] Figure 12 is a perspective view of the insulation paper in the utility model;

[0034] Figure 13 is a perspective view of the stator core in the utility model.

[0035] In the figure, 1, stator core, 101, stator tooth, 102, stator yoke, 103, tooth shoe, 2, stator framework, 201, annular outer blocking table, 202, inner blocking table, 203, connecting tooth, 3, insulation paper, 301, bending wing part, 302, middle panel, 4, winding slot, 5, first boss, 6, winding port, 7, first plane, 8, second plane, 9, third plane, 10, convex step, 11, wire inlet slot, 1101, first slot, 1102, second slot, 12, second boss, 13, first surface, 14, second surface. DETAILED DESCRIPTION

[0036] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0037] Embodiment one

[0038] As shown in FIG. Figures 1-4 A stator assembly, comprising a stator core 1, a stator framework 2 and an insulation paper 3, the stator framework 2 has two, two stator frameworks 2 are same in structure, respectively located at both ends of the stator core 1, the stator framework 2 includes annular outer blocking table 201 and several circumferentially arranged inner blocking tables 202, the inner blocking table 202 is connected with the annular outer blocking table 201 through the connecting tooth 203, multiple winding slots 4 are formed between the inner blocking table 202 and the annular outer blocking table 201, and the inner blocking table 202 is in contact with the stator tooth 101 of the stator core 1.

[0039] As shown in FIG. Figure 6 and Figure 13As shown, the stator core 1 includes stator teeth 101, a stator yoke 102, and a tooth shoe 103 connecting the stator teeth 101 and the stator yoke 102, the annular outer blocking table 201 corresponds to the stator yoke 102, the inner blocking table 202 corresponds to the stator teeth 101, and the connecting tooth 203 corresponds to the tooth shoe 103. Then, the stator core 1 also corresponds to the winding slot 4. The winding slot 4 of the stator core 1 and the two stator skeletons 2 form an axially through slot structure. The insulating paper 3 is attached to the inner surface of the slot structure to shield the winding slot 4 of the stator core 1. As shown, Figure 12 According to the structural design of the winding slot 4, the two ends of the insulating paper 3 have a bending wing part 301 corresponding to the part of the stator teeth 101 facing the winding slot 4.

[0040] As shown, Figure 4 The end surface of the inner blocking table 202 facing the stator core 1 has a first boss 5 extending in the axial direction of the stator core 1. The first boss 5 is flush with the surface of the inner blocking table 202 facing the winding slot 4, that is, the first boss 5 does not protrude in the direction of the winding slot 4, thus not occupying the space of the winding slot 4. The surface of the stator teeth 101 of the stator core 1 facing the winding slot 4 is radially misaligned with the surface of the inner blocking table 202 facing the winding slot 4. The insulating paper 3 is clamped between the first boss 5 and the surface of the stator teeth 101 of the stator core 1 facing the winding slot 4. As shown, Figure 4 The surface of the stator teeth 101 of the stator core 1 facing the winding slot 4 is a first surface 13. The surface of the inner blocking table 202 facing the winding slot 4 is a second surface 14. The second surface 14 is also the surface of the first boss 5 facing the winding slot 4. The insulating paper 3 is clamped between the first boss 5 and the first surface 13.

[0041] The first boss 5 limits the radial position of the insulating paper 3. The first boss 5 blocks the insulating paper 3 and can completely clamp the insulating paper 3, preventing it from moving radially. This prevents the insulating paper 3 from being pulled off the surface of the stator core 1 due to excessive winding tension, causing the insulating paper 3 to be clamped into the winding and not functioning as an insulating shield.

[0042] In the axial direction, the insulating paper 3 can be limited by the lower surface of the inner blocking table 202. Therefore, the insulating paper 3 is limited in the axial and radial directions, ensuring that the insulating paper 3 is firm during the winding process (the insulating paper 3 does not bend or curl, etc.). This completely isolates the stator core 1 and the winding from the insulating paper 3, preventing current on the winding from being conducted to the stator core 1 or the water pump shell, thereby ensuring the safe use of the electronic water pump.

[0043] For the convenience of description, in the following, the surface of the stator tooth 101 facing the wire slot 4 is named as the inner surface of the stator tooth 101, the surface of the inner blocking table 202 facing the wire slot 4 is named as the inner surface of the inner blocking table 202, the inner surface of the stator tooth 101 and the inner surface of the inner blocking table 202 are arranged radially staggered, in order to leave a space between the first boss 5 and the inner surface of the stator tooth 101 in the radial direction, for placing the insulation paper 3.

[0044] In the traditional structure, the inner surface of the stator tooth 101 and the inner surface of the inner blocking table 202 are arranged in alignment, the present application arranges the two staggered, so that the inner surface of the first boss 5 can be aligned with the inner surface of the inner boss, the first boss 5 does not need to protrude to the wire slot 4 direction, does not occupy the internal space of the wire slot 4, the winding will not be interfered by the first boss 5 when winding to the first boss 5, so that the winding can be wound in the entire inner surface range of the inner blocking table 202, the slot fill rate is maximized.

[0045] In the stator frame 2, a plurality of inner blocking tables 202 are arranged in a circumferential array, and a wire slot 6 is formed between adjacent two inner blocking tables 202, and the first boss 5 is arranged close to the wire slot 6 and can press the edge of the bent wing part 301.

[0046] The shape of the inner blocking table 202 is shaped like the stator tooth 101, as shown in Figure 3 and Figure 6 The side surface of the inner blocking table 202 facing the annular outer blocking table 201 (i.e. the inner side surface of the inner blocking table 202) comprises a first plane 7 and a second plane 8 and a third plane 9 arranged symmetrically on both sides of the first plane 7 and inclined to the first plane 7, and the first boss 5 is located on the second plane 8 and the third plane 9. The second plane 8 and the third plane 9 are arranged radially staggered with the corresponding surface on the stator tooth 101, and the bent wing part 301 of the insulation paper 3 in the two wire slots 4 respectively abuts below the second plane 8 and the third plane 9.

[0047] Embodiment two

[0048] On the basis of embodiment one, the surface of the annular outer blocking table 201 facing the wire slot 4 has a second boss 12, and the axial end surface of the insulation paper 3 abuts against the second boss 12. The axial direction refers to the direction parallel to the center axis of the stator assembly. As shown in Figure 5 and Figure 9 The middle panel 302 of the insulation paper 3 contacts the annular outer blocking table 201, for isolating the stator yoke 102 of the stator core 1 and the winding, the second boss 12 is used to abut against the end of the middle panel 302, and the first boss 5 and the inner blocking table 202 respectively abut against the same end of the insulation paper 3 at the bent wing part 301 and the middle panel 302, to strengthen the axial limiting effect.

[0049] In a preferred embodiment, the second boss 12 is positioned in the middle of the corresponding winding groove 4, directly opposite the winding opening 6. This prevents the winding from getting tangled around the second boss 12, thus avoiding interference and obstruction of the winding needle by the second boss 12 during the winding process.

[0050] Regarding the shape of the second boss 12, as follows Figure 5 and Figure 10 As shown, in this embodiment, the second boss 12 preferably has a triangular cross-section, wherein the bottom surface (the side closest to the insulating paper 3) is a plane that abuts against the end of the insulating paper 3, increasing the contact area with the end of the insulating paper 3 and ensuring a firm abutment. This ensures that the insulating paper 3 does not move axially and that the insulating paper 3 is not moved by the enameled wire during the winding process, thus preventing the insulating paper 3 from getting stuck inside the enameled wire. The top of the second boss 12 (the side facing away from the insulating paper 3) is beveled, which facilitates mold processing and avoids interference to the winding needle that may occur during the winding process (because the bevel reduces the space occupied by the second boss 12 in the axial direction).

[0051] Example 3

[0052] To address the problem in the prior art where the contact area between the stator tooth 101 and the inner baffle 202 is prone to exposure of the stator tooth 101 due to slight movement of the insulating paper 3, this embodiment makes the following improvement based on Embodiment 1 or Embodiment 2: An axial gap exists between the end face of the inner baffle 202 that abuts against the end of the insulating paper 3 and the end face of the stator tooth 101 of the stator core 1. That is, an axial gap exists between the lower end of the inner baffle 202, connected by the second plane 8 and the third plane 9, and the upper end face of the stator tooth 101. When the bent wing 301 of the insulating paper 3 is sandwiched between the first boss 5 and the stator tooth 101, the upper end of the insulating paper 3 abuts against the lower end face of the inner baffle 202 connected by the second plane 8 or the third plane 9. Since the stator core 1 does not reach the height of the lower surface of the second plane 8 or the third plane 9, even if the upper end of the insulating paper 3 has slight movement or does not fully contact the lower end face of the inner baffle 202, the stator core 1 will not be exposed.

[0053] The aforementioned axial clearance can be achieved through the following structure: the end face of the inner baffle 202 facing the stator core 1 has a raised step 10, the end faces of the inner baffle 202 located on both sides of the raised step 10 abut against the ends of the insulating paper 3, and the stator teeth 101 of the stator core 1 abut against the raised step 10. For example... Figure 8 As shown, the end face of the inner baffle 202 facing the stator tooth 101 is non-planar, the raised step 10 is located in the middle of the end face and protrudes from the opposite side surfaces, and the first boss 5 is located on the side surfaces.

[0054] The protruding step 10 is connected with the connecting tooth 203, and the width of the protruding step 10 is not greater than the width of the connecting tooth 203, that is, the protruding step 10 does not have a surface facing the wire slot 4, so as to avoid interference of the protruding step 10 with the installation of the insulating paper 3.

[0055] The connecting tooth 203 has a certain thickness in the axial direction, so as to ensure the strength of the stator frame 2 (especially suitable for the case that the wire diameter of the winding is relatively large) and ensure the existence of the axial gap between the bottom surface of the inner blocking step 202 and the stator core 1. In the embodiment, the end surface of the connecting tooth 203 facing the stator core 1 is flush with the end surface of the protruding step 10 facing the stator core 1, and the axial height of the connecting tooth 203 is less than the axial height of the inner blocking step 202. As shown in FIG. 4, which is a partial schematic view of the bottom of the stator frame 2 upward, the bottom end of the connecting tooth 203 (the upper end of the connecting tooth 203 in FIG. 4) is flush with the bottom end of the protruding step 10 (the upper end of the protruding step 10 in FIG. 4). As shown in FIG. 5, which is a partial schematic view of the bottom of the stator frame 2 upward, the top end of the connecting tooth 203 is lower than the top end of the inner blocking step 202, and the part of the inner blocking step 202 protruding from the connecting tooth 203 can shield the winding. Figure 8 Figure 8 Figure 8 Figure 6

[0056] Embodiment Four

[0057] The end of the annular outer blocking step 201 away from the stator core 1 is usually provided with a plurality of wire inlet notches 11. The conventional wire inlet notch 11 is a simple rectangular slot. In this case, the bottom wire is randomly placed near the wire inlet notch 11, and in the winding process, the later-wound enameled wire is prone to scratching the bottom wire, causing damage to the insulating layer of the enameled wire.

[0058] The embodiment improves the wire inlet notch 11 based on the above-mentioned embodiments to solve the technical problem: the wire inlet notch 11 comprises a first notch 1101 and a second notch 1102 arranged continuously, and the inner side surface of the first notch 1101 is recessed to a greater depth than the inner side surface of the second notch 1102. The inner side surface of the first notch 1101 and the inner side surface of the second notch 1102 refer to the side surface facing the wire slot 4. The different recess depths of the inner side surface of the first notch 1101 and the inner side surface of the second notch 1102 can make the inner side surface of the first notch 1101 have a limiting space capable of clamping the bottom wire, so as to hide the bottom wire in the limiting space and protect the later-wound enameled wire, thereby protecting the insulation performance of the winding and ensuring the safe use of the electronic water pump.

[0059] ​​​​The recess depths of the inner side of the first slot 1101 and the inner side of the second slot 1102 are different, which can be realized by setting the inner side of the first slot 1101 and the inner side of the second slot 1102 as inner recessed surfaces, only the recess depths are different, or by setting the inner side of the first slot 1101 as an inner recessed surface and setting the inner side of the second slot 1102 as a normal vertical surface. Figure 11 As shown in the figure, the inner side of the first slot 1101 is cut as an inclined surface, and the inner side of the second slot 1102 is a vertical surface. The second slot 1102 is provided to facilitate the passing of the winding needle (especially for the enameled wire with a relatively thick diameter). Because the space of the inclined surface on the first slot 1101 is limited (if the first slot 1101 is too wide, the limiting effect on the bottom wire will be weakened, and if it is too narrow, the winding needle will not be convenient to pass through), through the addition of the first slot 1101, the smooth passing of the winding needle under the thick wire diameter can be ensured.

[0060] Embodiment five

[0061] An electronic water pump comprising the stator assembly described above.

[0062] In the description of the utility model, it is understood that the terms "thickness", "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0063] In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0064] In the present specification, the illustrative expressions of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.

[0065] Based on the above ideal embodiments according to the utility model, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A stator assembly characterized by: The stator assembly comprises a stator core (1), a stator frame (2) and insulation paper (3), the stator frame (2) is located at both ends of the stator core (1), the stator frame (2) comprises an annular outer blocking table (201) and a plurality of circumferentially arranged inner blocking tables (202), the inner blocking table (202) is connected with the annular outer blocking table (201) through a connecting tooth (203), a plurality of winding slots (4) are formed between the inner blocking table (202) and the annular outer blocking table (201), and the inner blocking table (202) is in corresponding contact with the stator teeth of the stator core (1); The end surface of the inner blocking table (202) towards the stator core (1) has a first boss (5) extending in the axial direction towards the stator core (1), the first boss (5) is flush with the surface of the inner blocking table (202) towards the winding slot (4), the surface of the stator tooth of the stator core (1) towards the winding slot (4) is arranged radially offset from the surface of the inner blocking table (202) towards the winding slot (4), and the insulation paper (3) is clamped between the first boss (5) and the surface of the stator tooth of the stator core (1) towards the winding slot (4).

2. The stator assembly of claim 1, wherein: Two adjacent inner blocking tables (202) are spaced apart to form a winding port (6), and the first boss (5) is arranged close to the winding port (6).

3. The stator assembly of claim 1, wherein: The end surface of the inner blocking table (202) abutting the end portion of the insulation paper (3) in the axial direction has an axial gap between the end surface and the end surface of the stator tooth of the stator core (1).

4. The stator assembly of claim 3, wherein: The end surface of the inner blocking table (202) towards the stator core (1) has a raised step (10), the end surfaces of the inner blocking tables (202) located on both sides of the raised step (10) abut the end portion of the insulation paper (3), and the stator tooth of the stator core (1) abuts the raised step (10).

5. The stator assembly of claim 1, wherein: The surface of the annular outer blocking table (201) towards the winding slot (4) has a second boss (12), and the axial end surface of the insulation paper (3) abuts the second boss (12).

6. The stator assembly of claim 1, wherein: The annular outer blocking table (201) is provided with a plurality of wire inlet slots (11) at an end away from the stator core (1), the wire inlet slots (11) comprise a first slot (1101) and a second slot (1102) arranged continuously, and the inner side surface of the first slot (1101) is recessed deeper than the inner side surface of the second slot (1102).

7. The stator assembly of claim 6, wherein: The inner side surface of the first slot (1101) is chamfered, and the inner side surface of the second slot (1102) is vertical.

8. The stator assembly of claim 4, wherein: The connecting tooth (203) is connected with the raised step (10), the end surface of the connecting tooth (203) towards the stator core (1) is flush with the end surface of the raised step (10) towards the stator core (1), and the axial height of the connecting tooth (203) is smaller than the axial height of the inner blocking table (202).

9. The stator assembly of claim 5, wherein: The cross section of the second boss (12) is triangular, the end surface of the second boss (12) abutting the insulation paper (3) is a plane, and the end surface of the second boss (12) facing away from the insulation paper (3) is a chamfered surface.

10. An electronic water pump characterized by: The stator assembly comprises the stator assembly of any one of claims 1-9.

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