Air trapping prevention stator core and casing combination structure of electronic water pump

Abstract

The utility model discloses an electronic water pump air trapping prevention stator core and casing combination structure, which comprises a stator core and a plastic casing wrapping the stator core, and at least one exposed belt from the bottom of the stator core to the top of the stator core is formed at the position of a tooth groove and / or a tooth crest of the plastic casing. According to the exposed belt, the stator iron core is not wrapped by the plastic casing, the original structure pattern is kept, and by arranging at least one exposed belt from the bottom to the top of the stator iron core, in a thermal change state, the plurality of stator sheets of the stator iron core can be discharged from the exposed belt when air in a small air cavity formed by stacking expands. The problem that the water pump shell expands or cracks when air in the small air cavity expands in the thermal change state of an existing fully-coated water pump shell is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pumps, in particular to an anti-trapping gas stator iron core casing combination structure of an electronic water pump. Background Art

[0002] Electronic water pumps currently used in new energy vehicles are gradually developing towards lightweight design. During this development, electronic water pumps have gradually adopted structures that use plastic instead of steel, especially for the housing that holds the built-in stator core of the electronic water pump. This often uses positioning grooves on the outer ring of the stator core yoke to cooperate with positioning posts on the housing. However, this structure separates the plastic housing from the stator core, which can easily cause the outer ring of the stator core yoke and the plastic housing to creep relative to each other, leading to separation between the stator core and the plastic housing. To address this technical problem, Chinese patent document CN222702237U discloses an integrated plastic-coated water pump housing, comprising a water pump housing, a drive shaft and a rotor disposed in the middle of the water pump housing, and a stator assembly that is plastic-coated within the water pump housing. This complete encapsulation makes it difficult for air between the stator core laminations to escape, resulting in trapped air. Ultimately, when the electronic water pump is operated under high-temperature conditions, the retained gas between the stator core laminations expands, causing the plastic housing to swell or crack. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the present invention provides an electronic water pump anti-air trapped stator core housing combination structure, which includes a stator core and a plastic housing covering the stator core, wherein the plastic housing forms at least one exposed strip from the bottom to the top of the stator core at the position of the tooth slot and / or the tooth top. The exposed strip means that the stator core is not covered by the plastic housing and maintains the original structural appearance. By setting at least one exposed strip from the bottom to the top of the stator core, under the thermal deformation state, the air in the small air cavity formed by the stacking of the multiple stator sheets of the stator core can be discharged from the exposed strip when it expands, thereby avoiding the problem of the existing fully covered water pump housing causing the water pump housing to expand or crack when the air in the small air cavity expands under the thermal deformation state. Furthermore, during the liquid molding process of the plastic housing, the air in other positions is squeezed into the small air cavity and then discharged through the exposed strip.

[0004] Preferably, the plastic housing forms at least one exposed strip from the bottom to the top of the stator core at the position of the tooth top.

[0005] More preferably, the plastic housing forms an exposed strip extending from the bottom to the top of the stator core at the tooth tops. This exposed strip, in addition to the aforementioned benefits, maximizes the exposed area, maintaining the strength of the plastic housing and maximizing the retention of the stator core, preventing microscopic creep of the stator core against the plastic housing.

[0006] In one embodiment, a plurality of offset tongues are formed on the plastic casing covering the upper and lower ends of the stator core.

[0007] Preferably, a plurality of offset tongues are formed on the plastic casing covering the upper and lower ends of the stator core yoke. By providing the offset tongues, when the stator core undergoes microscopic creep in a certain direction, one side of the offset tongue will have a tendency to move, while the other side will generate stress that hinders this tendency to move, thereby creating a bow-like effect, always using an instinct to return to its original state, to offset the creep of the stator core as much as possible.

[0008] In one embodiment, a plurality of positioning support holes are formed on the plastic casing covering the end of the stator core connection portion. The holes are formed during the production process, specifically, after the column for positioning and supporting the stator core is removed.

[0009] The plastic housing is provided with column platforms connected with the front and rear end covers at both axial ends.

[0010] A plurality of limiting reinforcement ribs are formed on the outer side of the plastic housing.

[0011] In one embodiment, the outer ring of the stator core's yoke is formed with an axial groove; correspondingly, the plastic housing forms an anti-rotation post that mates with the axial groove. The axial groove can be derived from the stator core's positioning slot or can be newly machined. The anti-rotation post is formed by filling the axial groove with liquid plastic, cross-fixing the plastic housing to the stator core and further preventing stator core creep.

[0012] In one embodiment, the upper and lower ends of the baffle portion form auxiliary pieces opposite to the offset tongue piece. By setting the offset tongue piece and the auxiliary piece, it becomes a positioning and limiting structure during winding, facilitating the winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the specific implementation methods of the present invention, the following is a brief introduction to the drawings required for use in the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 Is a schematic structural diagram of the stator core of the utility model;

[0015] Figure 2 This is a three-dimensional diagram of the stator core and housing combination structure of the present utility model;

[0016] Figure 3This is a schematic structural diagram of the stator core-housing combination structure (including windings) of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of the stator core housing combination structure and the rotor of the utility model;

[0018] The reference numerals in the figure are as follows: 1-stator core; 2-yoke; 3-tooth slot; 4-tooth; 5-connecting part; 6-blocking part; 7-tooth top; 8-axial groove; 9-plastic housing; 10-offsetting tongue; 11-positioning support hole; 12-column; 13-limiting reinforcement rib; 14-auxiliary plate; 15-rotor; 16-winding. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings. It is obvious that the embodiments described are only some of the embodiments of the present invention, not all of them. The embodiments of the present invention and other embodiments obtained by persons of ordinary skill in the art without creative effort are all within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example 1

[0023] like Figure 1-4 As shown, this embodiment discloses an electronic water pump anti-air trapped stator core housing combination structure, which includes a stator core 1 and a plastic housing 9 covering the stator core 1. In this embodiment, the structure of the stator core 1 can refer to Figure 1 It is composed of multiple stacked stator laminations, basically including a yoke 2 and teeth 4 located within the yoke 2. Slots 3 are formed between two adjacent teeth 4. Each tooth 4 includes a connecting portion 5 connected to the yoke 2 and a baffle 6 connected to the other end of the connecting portion 5. The end of the baffle 6 closest to the rotor and both ends of this end form tooth tops 7. The plastic housing 9 is formed by covering the stator core 1. It is specifically formed by positioning the stator core 1 and injection molding. The specific shape can be designed according to actual needs. The plastic housing 9 of this embodiment does not completely cover the stator core 1, but forms at least one exposed strip from the bottom to the top of the stator core 1 at the position of the tooth slot 3 and / or the tooth top. As for the position of the tooth slot 3, it specifically refers to the side wall of the tooth slot 3. As for the position of the tooth top 7, it has been described in detail above. As for the exposed strip, it refers to the area not covered by the plastic housing 9, or the original structure of the stator core 1 at the above position. As for from the bottom to the top, it specifically refers to the gaps between adjacent stator sheets of all stator sheets within the exposed strip that are connected to the atmosphere because they are not covered. Preferably, the plastic housing 9 forms at least one exposed strip from the bottom to the top of the stator core 1 at the position of the tooth top 7. More preferably, the plastic housing 9 forms an exposed strip from the bottom to the top of the stator core 1 at the position of all tooth tops 7.

[0024] In one embodiment, the plastic housing 9 forms a plurality of offset tongues 10 at the upper and lower ends of the stator core 1. The number of the offset tongues 10 is not specifically limited, and is preferably evenly arranged circumferentially. In this embodiment, the number of the offset tongues 10 matches the number of the teeth 4, which is 6, and corresponds one to one with the teeth 4. Specifically, Figure 2-Figure 4 As shown, the offset tongue 10 is formed at a position on the yoke 2 corresponding to the tooth top 7, but is of course not limited to this position on the yoke 2 and can also be formed at other positions on the yoke 2. The structure of the offset tongue 10 is varied, preferably in an arc shape, with a structure that is smaller at the top and larger at the bottom, and a chamfer or arc-shaped transition is formed at the edge, especially at the end near the yoke 2.

[0025] In one embodiment, the plastic housing 9 forms a positioning support hole 11 at the end of the connecting portion 5 of the stator core 1 .

[0026] In one embodiment, columns 12 connected to the front and rear end covers are provided at both axial ends of the plastic housing 9 , and connection holes are designed on the columns 12 .

[0027] In one embodiment, a plurality of limiting reinforcement ribs 13 are formed on the outer side of the plastic housing 9, preferably uniformly arranged around the circumference.

[0028] In one embodiment, the outer ring of the yoke 2 of the stator core 1 is formed with an axial groove 8. Correspondingly, the plastic housing 9 forms an anti-rotation post (not shown) that matches the axial groove 8. There is no specific limitation on the number of axial grooves 8. In this embodiment, there is one axial groove 8. The structure is preferably semicircular, with chamfers or curved transitions formed at points where it connects to other structures.

[0029] In one embodiment, the upper and lower ends of the baffle portion 6 form auxiliary pieces 14 that oppose the offset tongue piece 10. The auxiliary pieces 14 can have various structures, preferably being arc-shaped, smaller at the top and larger at the bottom, and having chamfered edges. The auxiliary pieces 14 are positioned opposite the offset tongue piece 10 to restrict and / or assist the winding in forming the winding 16.

[0030] More preferably, the exposed strip also includes the top and bottom end portions of the stator core 1 near the tooth top 7, or in other words, the top and bottom end portions of the stator core 1 near the tooth top 7 are not covered by the plastic housing 9. Figure 2 and Figure 3 shown.

[0031] The preparation process of the electronic water pump anti-air trapped stator core and housing combination structure of the present invention is as follows: a suitable mold is designed according to the required shape of the electronic water pump and the required structure of the stator core, and then the stator core is positioned and supported, and finally injection molding is performed. After the injection molding is completed, cooling is performed and demolding is performed after cooling.

[0032] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An electronic water pump anti-air trapped stator core housing combination structure, comprising a stator core and a plastic housing covering the stator core, characterized in that: The plastic housing forms at least one exposed strip from the bottom to the top of the stator core at the position of the tooth slots and / or tooth tops.

2. The electronic water pump anti-trapped air stator core housing combination structure according to claim 1, characterized in that: The plastic housing forms at least one exposed strip from the bottom to the top of the stator core at the position of the tooth top.

3. The electronic water pump anti-trapped air stator core housing combination structure according to claim 2, characterized in that: The plastic casing forms a bare strip from the bottom to the top of the stator core at the position of the tooth top.

4. The electronic water pump anti-trapped air stator core housing combination structure according to claim 3, characterized in that: A plurality of offset tongues are formed on the plastic casing covering the upper and lower ends of the stator core.

5. The electronic water pump anti-air trapped stator core housing combination structure according to claim 4, characterized in that: A plurality of offset tongues are formed on the plastic casing covering the upper and lower ends of the stator core yoke.

6. The electronic water pump anti-trapped air stator core housing combination structure according to claim 5, characterized in that: A plurality of positioning support holes are formed on the plastic casing covering the end of the stator core connection part.

7. The electronic water pump anti-air trapped stator core housing combination structure according to any one of claims 1 to 6, characterized in that: The plastic housing is provided with column platforms connected with the front and rear end covers at both axial ends.

8. The electronic water pump anti-trapped air stator core housing combination structure according to claim 7, characterized in that: A plurality of limiting reinforcement ribs are formed on the outer side of the plastic housing.

9. The electronic water pump anti-air trapped stator core housing combination structure according to any one of claims 1 to 6, characterized in that: An outer ring of the yoke of the stator core is formed with an axial groove; correspondingly, the plastic housing forms an anti-rotation column matching the axial groove.

10. The electronic water pump anti-air trapped stator core housing combination structure according to claim 5, characterized in that: The upper and lower ends of the blocking piece portion form auxiliary pieces opposite to the offset tongue piece.

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