Electric water pump

Abstract

An electric water pump (100) according to the present invention is provided with: an impeller assembly (3) including an impeller (31) formed in a hollow annular shape and a magnet (32) fitted to the lower surface of the impeller (31); the stator assembly (5) is composed of a stator iron core (51), a coil (52) and an insulating layer (53); a housing (1) including a first housing (12) fitted to the upper surface of the impeller assembly (3) and a second housing (13) for housing the stator assembly (5); and a waterproof bush (4), the upper surface of the waterproof bush (4) is embedded with the lower surface of the impeller assembly (3), the first shell (12) and the waterproof bush (4) are mutually clamped in a manner of accommodating the impeller assembly (3), and at least one abutting part (8, 9) used for abutting against the impeller assembly (3) is formed on the upper surface of the waterproof bush (4).

Description

Technical Field

[0001] The present invention relates to an electric water pump, and in particular to an electric water pump with an axial flux motor drive structure used in a thermal management system of a vehicle. Background Art

[0002] In the prior art, a radial flux motor drive structure, i.e., an RFPM motor drive structure, is generally used for an electric water pump in a thermal management system installed on a vehicle. In the RFPM motor drive structure, the axial length of the stator core is consistent with the axial length of the rotor core, and the rotor structure is assembled inside the stator structure, so that the magnetic flux direction is the same as the radial direction.

[0003] Moreover, since the driving structure of the existing electric water pump is a radial flux motor driving structure, the rotor structure of the motor drives the impeller to rotate through the shaft structure or a structure equivalent to the shaft structure, and the coolant is continuously sucked and discharged by the impeller in the water pump, forming a relatively stable flow rate.

[0004] Specifically, Figure 8 2 is a diagram showing an example of an exploded structure of an electric water pump 200 according to the prior art. Figure 8 As shown, in the RFPM motor drive structure of the electric water pump 200, an axis structure or a structure equivalent to the axis structure is formed on the lower surface of the impeller structure 30 by casting or the like, and a rotor structure 20 including an iron core and a magnet is formed on the axis structure or the structure equivalent to the axis structure, and then the axis structure or the structure equivalent to the axis structure is inserted into the inner wall side of the stator structure 50, thereby forming the motor part of the electric water pump 200.

[0005] However, in the electric water pump 200 adopting the RFPM motor drive structure, since the rotor structure 20 is inserted into the inner diameter side of the stator structure 50 through the shaft structure or a structure equivalent to the shaft structure, the lead wire structure 60 for electrically connecting the drive circuit is led out from the bottom of the stator structure 50, resulting in the electric water pump 200 with a radial flux motor drive structure having a complex structural form and low space utilization.

[0006] In order to solve the problem that an electric water pump having a radial flux motor drive structure has a complex structure and low space utilization, an electric water pump having an axial flux motor drive structure has been proposed.

[0007] Specifically, in an axial flux motor drive structure, namely, an AFPM motor drive structure, which is different from the RFPM motor drive structure, the outer diameter and inner diameter of the stator core and the rotor core remain consistent, but the axial length is different, and the stator part and the rotor part are assembled relative to each other along the axial direction, so that the magnetic flux direction is the same as the axial direction.

[0008] Therefore, by using an axial flux motor structure, the impeller is directly fixed on the surface of the rotor structure of the motor, thereby solving the problem that the radial flux motor drive structure occupies a large space and has a complex sealing form.

[0009] For example, Patent Document 1 discloses an electric water pump (not shown) using an axial flux motor. Specifically, an impeller fixed to a rotating shaft is rotatably accommodated in a pump housing having an inlet and an outlet, a disc-shaped permanent magnet is fixed to the bottom surface of the impeller, and a motor housing is connected to the bottom wall of the pump housing. An armature of an axial gap motor composed of permanent magnets is accommodated in the motor housing, and the armature generates a rotating magnetic field on the surfaces of a plurality of cores facing the permanent magnets, and the permanent magnets rotate by the rotating magnetic field, and the rotation of the permanent magnets causes the impeller to rotate around the central axis of the rotating shaft.

[0010] However, in Patent Document 1, in order to suppress the vibration generated by the impeller during rotation, a rotating shaft is fixed to the impeller, and the rotating shaft is inserted into the inner diameter side of the stator structure, so the drive circuit can only be installed at the bottom of the motor housing, resulting in an increase in the overall volume of the axial flux motor, a decrease in space utilization, and further enlargement of the overall structure of the electric water pump. Prior art literature Patent Literature

[0011] Patent Document 1: Japanese Patent Application Publication No. JP2016223397A Summary of the invention Technical problem to be solved by the invention

[0012] The present invention is completed to solve the above-mentioned problems, and its purpose is to provide an electric water pump adopting an axial flux motor drive structure, which forms an impeller assembly by combining the impeller and the rotor into one, and omits the rotating shaft structure and instead uses the abutment portion that abuts against the impeller to suppress the jitter generated when the impeller assembly rotates. In this way, the jitter generated when the impeller assembly rotates can be suppressed while making the structure of the electric water pump simple and compact, thereby improving the overall space utilization of the electric water pump and realizing the miniaturization of the electric water pump.

[0013] Furthermore, another object of the present invention is to arrange a drive circuit along the inner diameter side of the stator assembly, thereby making the structure of the electric water pump simpler and more compact, thereby improving the overall space utilization of the electric water pump and further realizing the miniaturization of the electric water pump.

[0014] Furthermore, another object of the present invention is that, compared with the electric water pump that adopts the radial flux motor drive structure in the prior art, the electric water pump of the present invention adopts the axial flux motor drive structure, so that the iron core structure is not used in the rotor assembly, thereby making the weight of the rotor structure lighter and the cost lower, and further making the processing technology of the impeller assembly simple and the cost lower. Technical means for solving technical problems

[0015] The present invention provides an electric water pump, which comprises: an impeller assembly, which includes an impeller formed in a hollow ring shape and a magnet embedded in the lower surface of the impeller; a stator assembly, which consists of an iron core, a coil and an insulating layer; a shell, which includes a first shell embedded in the upper surface of the impeller assembly and a second shell for accommodating the stator assembly; and a waterproof bushing, the upper surface of the waterproof bushing is formed to be embedded in the lower surface of the impeller assembly, the first shell and the waterproof bushing are engaged with each other in a manner of accommodating the impeller assembly, and at least one abutment portion for abutting the impeller assembly is formed on the upper surface of the waterproof bushing.

[0016] Furthermore, in the electric water pump according to the present invention, the abutment portion includes an inner wall side abutment portion formed on the waterproof bushing to abut against an inner wall side of the impeller.

[0017] Furthermore, in the electric water pump according to the present invention, the abutment portion includes at least one outer wall side abutment portion, and the inner wall side abutment portion is formed on the waterproof bushing to abut against the outer wall side of the impeller.

[0018] Furthermore, in the electric water pump involved in the present invention, the abutment portion includes: at least one inner wall side abutment portion, which is formed on the waterproof bushing to abut against the inner wall side of the impeller; and at least one outer wall side abutment portion, which is formed on the waterproof bushing to abut against the outer wall side of the impeller.

[0019] Furthermore, in the electric water pump according to the present invention, a recessed portion is formed in the second housing along an inner diameter side of the stator assembly.

[0020] Furthermore, in the electric water pump of the present invention, in the second housing, a lead wire assembly and a drive circuit are housed in the recess, the lead wire assembly includes a lead wire bracket and a pin header, and is electrically connected to the drive circuit using the pin header.

[0021] Furthermore, in the electric water pump of the present invention, a groove is formed on the lower surface of the impeller, and the magnet is embedded in the groove by bonding, thereby forming the impeller assembly. Effects of the Invention

[0022] Firstly, according to the electric water pump involved in the present invention, since the rotating shaft structure is omitted and the abutment portion that abuts against the impeller is used to suppress the vibration generated when the impeller assembly rotates, the vibration generated when the impeller assembly rotates can be suppressed while making the structure of the electric water pump simple and compact, thereby improving the overall space utilization of the electric water pump and realizing the miniaturization of the electric water pump.

[0023] Furthermore, according to the electric water pump involved in the present invention, since the drive circuit is arranged along the inner diameter side of the stator assembly, the structure of the electric water pump can be made simpler and more compact, thereby improving the overall space utilization of the electric water pump and further realizing the miniaturization of the electric water pump.

[0024] Furthermore, according to the electric water pump involved in the present invention, since an axial flux motor drive structure is adopted, an iron core structure is not used in the rotor assembly, thereby making the rotor assembly lighter and the cost lower, and further making the processing technology of the impeller assembly simpler and the cost lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 2 is a cross-sectional view showing an example of the overall structure of an electric water pump 100 according to an embodiment of the present invention. Figure 2 1 is a diagram showing an exploded structural example of an electric water pump 100 according to an embodiment of the present invention. Figure 3 1 is a diagram showing an exploded structural example of the impeller assembly 3 in the electric water pump 100 according to the embodiment of the present invention. Figure 4 1 is a diagram showing an example of the overall structure of the impeller assembly 3 in the electric water pump 100 according to the embodiment of the present invention. Figure 5 1 is a diagram showing an example of the overall structure of the waterproof bushing 4 in the electric water pump 100 according to the embodiment of the present invention. Figure 6 1 is a diagram showing a structural example in which the inner wall side abutment portion 8 is provided in the electric water pump 100 according to the embodiment of the present invention. Figure 7 1 is a diagram showing a structural example in which the outer wall side abutment portion 9 is provided in the electric water pump 100 according to the embodiment of the present invention. Figure 8 2 is a diagram showing an exploded structural example of an electric water pump 200 according to the prior art. DETAILED DESCRIPTION

[0026] Regarding the structure of the electric water pump 100 involved in the present invention, in order to more clearly illustrate the technical solution involved in the present application, the following is a specific implementation method combined with the attached Figure 1-7 Further specific description is given. Moreover, the following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention, and should not be understood as a limitation of the present invention. Obviously, the drawings described below are only some examples of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0027] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] In addition, for ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein are interpreted accordingly.

[0029] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term. <Overall Structure of Electric Water Pump 100>

[0030] Below, refer to Figure 1 , the overall structure of the electric water pump 100 according to the embodiment of the present invention is described in detail.

[0031] Figure 1 1 is a cross-sectional view showing an example of the overall structure of the electric water pump 100 according to an embodiment of the present invention. Figure 1 As shown, the electric water pump 100 involved in the embodiment of the present invention comprises: an impeller assembly 3, which includes an impeller 31 formed in a hollow ring shape and a magnet 32 ​​embedded in the lower surface of the impeller 31; a stator assembly 5, which is composed of a stator core 51, a coil 52 and an insulating layer 53; a housing 1, which includes a first housing 12 embedded in the upper surface of the impeller assembly 3 and a second housing 13 for accommodating the stator assembly 5; and a waterproof bushing 4, the upper surface of which is formed to be embedded in the lower surface of the impeller assembly 3.

[0032] Specifically, if Figure 1 As shown, in the electric water pump 100 according to the embodiment of the present invention, the first housing 12 and the waterproof bushing 4 are engaged with each other, so that the impeller assembly 3 is accommodated between the first housing 12 and the waterproof bushing 4 .

[0033] Furthermore, if Figure 1 As shown, in the electric water pump 100 involved in the embodiment of the present invention, by fixing the stator assembly 5 to the lower surface of the waterproof bushing 4 and making the first shell 12 and the second shell 13 engage with each other on the outer peripheral side, the stator assembly 5 is accommodated in the space formed by the second shell 13 and the waterproof bushing 4 and is retained.

[0034] Moreover, if Figure 1 As shown, an O-ring 2 is provided on the outer circumference of the first shell 12 and the second shell 13 . After the first shell 12 and the second shell 13 are engaged with each other, the O-ring 2 is used to fix and seal the first shell 12 and the second shell 13 , thereby sealing the entire shell 1 .

[0035] Furthermore, if Figure 1 As shown, in the electric water pump 100 involved in the embodiment of the present invention, a recess 7 is formed in the second housing 13 along the inner diameter side of the stator assembly 5, and a lead wire assembly 6 and a drive circuit (not shown) for driving the electric water pump 100 are accommodated in the recess 7, and the lead wire assembly 6 includes a lead wire bracket 61 and a pin header 62, wherein the lead wire assembly 6 is fixed to the lower surface of the waterproof bushing 4 and electrically connected to the stator assembly 5 by the lead wire bracket 61, and is electrically connected to the drive circuit by the pin header 62.

[0036] Furthermore, if Figure 1 As shown, in the electric water pump 100 involved in the embodiment of the present invention, a coolant inlet 10 and a coolant outlet 11 are respectively formed on the outer surface of the first shell 12, so that the coolant enters the electric water pump 100 from the coolant inlet 10 and is then discharged from the electric water pump 100 from the coolant outlet 11.

[0037] Therefore, according to the electric water pump 100 involved in the embodiment of the present invention, by setting a drive circuit (not shown) along the inner diameter side of the stator assembly 5, the structure of the electric water pump 100 can be made simpler and more compact, thereby improving the overall space utilization of the electric water pump 100 and further realizing the miniaturization of the electric water pump 100.

[0038] Below, refer to Figures 2 to 4 , the exploded structure and the overall structure of the impeller assembly 3 in the electric water pump 100 according to the embodiment of the present invention are described in detail.

[0039] Figure 2 1 is a diagram showing an example of an exploded structure of an electric water pump 100 according to an embodiment of the present invention. Figure 3 1 is a diagram showing an exploded structural example of an impeller assembly 3 in an electric water pump 100 according to an embodiment of the present invention. Figure 4 1 is a diagram showing an example of the overall structure of the impeller assembly 3 in the electric water pump 100 according to the embodiment of the present invention.

[0040] Specifically, if Figure 3 As shown, in the electric water pump 100 according to the embodiment of the present invention, the impeller 31 is formed into a flat hollow ring, so that the impeller 31 has an inner wall side and an outer wall side. In addition, by forming the upper surface of the impeller 31 and the inner surface side of the first housing 12 into the same structure and substantially the same size, the upper surface of the impeller assembly 3 and the inner surface side of the first housing 12 are mutually fitted, and a plurality of slots are formed at equal intervals on the lower surface of the impeller 31, and the magnet 32 ​​is fitted into the slot by bonding.

[0041] like Figure 4 As shown, in the electric water pump 100 according to the embodiment of the present invention, the magnet 32 ​​is fixedly fitted into the groove of the impeller 31 , thereby obtaining the overall structure of the impeller assembly 3 .

[0042] Therefore, compared with the electric water pump 200 that adopts the radial flux motor drive structure in the prior art, the electric water pump 100 involved in the embodiment of the present invention forms an impeller assembly 3 with a rotor structure by combining the impeller 31 and the magnet 32 ​​into one. Therefore, compared with the existing rotor assembly constructed using an iron core structure, the iron core structure is not used, thereby making the weight of the rotor structure lighter and the cost lower, and further making the processing technology of the impeller assembly 3 simple and the cost lower.

[0043] Below, refer to Figure 2 and Figure 5 , the overall structure of the waterproof bushing 4 in the electric water pump 100 according to the embodiment of the present invention will be described in detail.

[0044] Figure 5 1 is a diagram showing an example of the overall structure of the waterproof bushing 4 in the electric water pump 100 according to the embodiment of the present invention. Figure 5 As shown, a recess is formed on the upper surface of the waterproof bushing 4 , and the recess has the same structure and substantially the same size as the lower surface of the impeller assembly 3 , so that the lower surface of the impeller assembly 3 is fitted into the recess formed on the upper surface of the waterproof bushing 4 .

[0045] In addition, if Figure 5 As shown, a plurality of grooves are formed at equal intervals on the lower surface of the waterproof bushing 4, and the shapes of the grooves correspond to the cross-sectional shape and positions of the stator core 51 in the stator assembly 5, respectively. Thus, by engaging the stator core 51 of the stator assembly 5 into the grooves formed on the lower surface of the waterproof bushing 4, the lower surface of the waterproof bushing 4 and the stator assembly 5 are interlocked with each other.

[0046] Below, refer to Figure 2 , the overall structure of the stator assembly 5 and the lead wire assembly 6 in the electric water pump 100 according to the embodiment of the present invention will be described in detail.

[0047] First, regarding the overall structure of the stator assembly 5, as shown in FIG. Figure 1 to Figure 2 As shown, the stator assembly 5 is composed of a stator core 51, a coil 52 and an insulating layer 53, wherein a plurality of stator cores 51 are formed and the cross-sectional shape of each stator core 51 is formed to be the same as the shape of the groove formed on the lower surface of the waterproof bushing 4, and an insulating material is covered on the outer surface of each stator core 51 to form an insulating layer 53, and finally the coil 52 is wound on the outer surface of each stator core 51, thereby forming the overall structure of the stator assembly 5.

[0048] Secondly, regarding the overall structure of the lead-out assembly 6, as shown in FIG. Figure 1 to Figure 2 As shown, the lead wire assembly 6 includes a lead wire bracket 61 and a pin header 62, and is electrically connected to a drive circuit (not shown) by means of the pin header 62. The lead wire bracket 61 is formed in a flat shape, is fixed to the lower surface of the stator assembly 5 and is electrically connected to the stator assembly 5, and the pin header 62 is inserted into the lead wire bracket 61, thereby enabling the overall structure of the lead wire assembly 6 to be electrically connected to the drive circuit.

[0049] Below, refer to Figure 6 Detailed description will be given of a structural example of the inner wall side abutment portion 8 in the electric water pump 100 according to the embodiment of the present invention.

[0050] Figure 6 FIG. 2 is a diagram showing a structural example of an electric water pump 100 according to an embodiment of the present invention provided with an inner wall side contact portion 8. Figure 6 As shown, at least one inner wall side abutting portion 8 for abutting against the inner wall side of the impeller 31 is formed on the upper surface of the waterproof bushing 4 .

[0051] For example, a convex portion is formed on the upper surface of the waterproof bushing 4 along the inner wall side of the impeller 31 to serve as the inner wall side contact portion 8. Of course, in addition to the convex portion, as the inner wall side contact portion 8, a structure such as a snap-fit ​​or press-fit structure can also be formed on the upper surface of the waterproof bushing 4 along the inner wall side of the impeller 31. In other words, any structure can be used as long as the waterproof bushing 4 and the impeller assembly 3 can be contacted from the inner wall side to suppress the vibration generated when the impeller assembly 3 rotates.

[0052] In summary, if Figure 6 As shown, in the electric water pump 100 involved in the embodiment of the present invention, the impeller 31 and the magnet 32 ​​are combined into one to form an impeller assembly 3 with a rotor structure, and the rotating shaft structure in patent document 1 is omitted. Instead, the inner wall side abutting portion 8 abutting against the inner wall side of the impeller 31 is used to suppress the vibration generated when the impeller assembly 3 rotates. In this way, the vibration generated when the impeller assembly 3 rotates can be suppressed while making the structure of the electric water pump 100 simple and compact, thereby improving the overall space utilization of the electric water pump 100 and realizing the miniaturization of the electric water pump 100.

[0053] Below, refer to Figure 7 Detailed description will be given of a structural example of the outer wall side abutment portion 9 in the electric water pump 100 according to the embodiment of the present invention.

[0054] Figure 7 FIG. 2 is a diagram showing a structural example in which the outer wall side contact portion 9 is provided in the electric water pump 100 according to the embodiment of the present invention. Figure 7As shown, at least one outer wall side contact portion 9 for contacting the outer wall side of the impeller 31 is formed on the upper surface of the waterproof bushing 4 .

[0055] For example, a convex portion is formed on the upper surface of the waterproof bushing 4 along the outer wall side of the impeller 31 to serve as the outer wall side contact portion 9. Of course, in addition to the convex portion, as the outer wall side contact portion 9, a structure such as a snap-fit ​​or crimping structure can also be formed on the upper surface of the waterproof bushing 4 along the outer wall side of the impeller 31. In other words, any structure can be used as long as the waterproof bushing 4 and the impeller assembly 3 can be contacted from the outer wall side to suppress the vibration generated when the impeller assembly 3 rotates.

[0056] In summary, if Figure 7 As shown, in the electric water pump 100 involved in the embodiment of the present invention, the impeller 31 and the magnet 32 ​​are combined into one to form an impeller assembly 3 with a rotor structure, and the rotating shaft structure in patent document 1 is omitted. Instead, the outer wall side abutting portion 9 abutting against the outer wall side of the impeller 31 is used to suppress the vibration generated when the impeller assembly 3 rotates. In this way, the vibration generated when the impeller assembly 3 rotates can be suppressed while making the structural form of the electric water pump 100 simple and compact, thereby improving the overall space utilization of the electric water pump 100 and realizing the miniaturization of the electric water pump 100.

[0057] In addition, combined Figure 6 and Figure 7 In the electric water pump 100 involved in the embodiment of the present invention, at least one inner wall side abutment portion 8 for abutting against the inner wall side of the impeller 31 and at least one outer wall side abutment portion 9 for abutting against the outer wall side of the impeller 31 can be formed simultaneously on the upper surface of the waterproof bushing 4.

[0058] For example, a convex portion is formed on the upper surface of the waterproof bushing 4 along the inner wall side of the impeller 31 as the inner wall side abutment portion 8, and a convex portion is formed along the outer wall side of the impeller 31 as the outer wall side abutment portion 9. Of course, in addition to the convex portion structure, as the inner wall side abutment portion 8 and the outer wall side abutment portion 9, a structure such as a snap-fit ​​or crimping structure can also be formed on the upper surface of the waterproof bushing 4 along the inner wall side and the outer wall side of the impeller 31. In other words, any structure can be used as long as the waterproof bushing 4 and the impeller assembly 3 can be abutted from both the inner wall side and the outer wall side to suppress the vibration generated when the impeller assembly 3 rotates.

[0059] In summary, if Figure 6 and Figure 7As shown, in the electric water pump 100 involved in the embodiment of the present invention, the impeller 31 and the magnet 32 ​​are combined into one to form an impeller assembly 3 with a rotor structure, and the rotating shaft structure in patent document 1 is omitted. Instead, the inner wall side abutting portion 8 abutting against the inner wall side of the impeller 31 and the outer wall side abutting portion 9 abutting against the outer wall side of the impeller 31 are used to suppress the vibration generated when the impeller assembly 3 rotates. In this way, the vibration generated when the impeller assembly 3 rotates can be suppressed while making the structural form of the electric water pump 100 simple and compact, thereby improving the overall space utilization of the electric water pump 100 and realizing the miniaturization of the electric water pump 100. <Overall Effect of Electric Water Pump 100>

[0060] First, according to the electric water pump 100 involved in the embodiment of the present invention, the impeller 31 and the magnet 32 ​​are combined into one to form an impeller assembly 3 with a rotor structure, and the rotating shaft structure in patent document 1 is omitted. Instead, the inner wall side abutting portion 8 abutting against the inner wall side of the impeller 31, or the outer wall side abutting portion 9 abutting against the outer wall side of the impeller 31, or the inner wall side abutting portion 8 and the outer wall side abutting portion 9 are used to suppress the vibration generated when the impeller assembly 3 rotates. In this way, the structure of the electric water pump 100 can be simple and compact while suppressing the vibration generated when the impeller assembly 3 rotates, thereby improving the overall space utilization of the electric water pump 100 and realizing the miniaturization of the electric water pump 100.

[0061] Secondly, according to the electric water pump 100 involved in the embodiment of the present invention, a driving circuit (not shown) is arranged along the inner diameter side of the stator assembly 5, so that the structure of the electric water pump 100 can be simpler and more compact, thereby improving the overall space utilization of the electric water pump 100 and further realizing the miniaturization of the electric water pump 100.

[0062] Finally, compared with the electric water pump 200 using the radial flux motor drive structure in the prior art, the electric water pump 100 according to the embodiment of the present invention forms an impeller assembly 3 having a rotor structure by combining the impeller 31 and the magnet 32 ​​as a whole. Therefore, compared with the existing rotor assembly formed by the iron core structure, the iron core structure is not used, so that the weight of the rotor structure is lightened and the cost is reduced, and further the processing technology of the impeller assembly 3 is simple and the cost is reduced. .

[0003] Although the present application describes various exemplary embodiments and examples, various features, methods, and functions described in one or more embodiments are not limited to application in specific embodiments and may be applied to the embodiments alone or in various combinations.

[0064] Therefore, it is considered that numerous modifications not shown in the examples are also included in the technical scope disclosed in the present specification, for example, including the case where at least one component is modified, added or omitted, and the case where at least one component is extracted and combined with components of other embodiments. Industrial Applicability

[0065] The electric water pump 100 according to the present invention can be applied to a thermal management system of a vehicle, and can also be applied to other thermal management systems. Description of symbols

[0066] 1 housing, 2 O-rings, 3.30 Impeller assembly, 4, 40 waterproof bushing, 5.50 stator assembly, 6, 60 lead wire assembly, 7 recess, 8 inner wall side abutment portion, 9 outer wall side abutment portion, 10 Coolant inlet, 11 Coolant outlet, 12 first shell, 13 second shell, 20 rotation axes, 31 impeller, 32 magnets, 51 stator core, 52 coils, 53 insulation layer, 61 Lead wire bracket, 62 pin headers, 100, 200 electric water pump.

Claims

1. An electric water pump, characterized in that: have: An impeller assembly including an impeller formed in a hollow ring shape and a magnet fitted to a lower surface of the impeller; A stator assembly, which consists of a stator core, a coil and an insulation layer; A housing, the housing comprising a first housing engaged with an upper surface of the impeller assembly and a second housing for accommodating the stator assembly; as well as a waterproof bushing, the upper surface of which is formed to fit into the lower surface of the impeller assembly, The first housing and the waterproof bushing are engaged with each other in a manner of accommodating the impeller assembly. At least one abutment portion for abutting against the impeller assembly is formed on the upper surface of the waterproof bushing.

2. The electric water pump according to claim 1, characterized in that: The abutting portion includes an inner wall side abutting portion formed on the waterproof bushing so as to abut against the inner wall side of the impeller.

3. The electric water pump according to claim 1, characterized in that: The abutting portion includes at least one outer wall side abutting portion, and the inner wall side abutting portion is formed on the waterproof bushing to abut against the outer wall side of the impeller.

4. The electric water pump according to claim 1, characterized in that: The abutting portion comprises: at least one inner wall side abutment portion formed on the waterproof bushing to abut against the inner wall side of the impeller; and At least one outer wall side abutment portion is formed on the waterproof bushing so as to abut against the outer wall side of the impeller.

5. The electric water pump according to any one of claims 1 to 4, characterized in that: In the second housing, a recess is formed along an inner diameter side of the stator assembly.

6. The electric water pump according to claim 5, characterized in that: In the second housing, a lead wire assembly and a driving circuit are housed in the recess. The lead wire assembly includes a lead wire bracket and a pin header, and is electrically connected to the driving circuit via the pin header.

7. The electric water pump according to any one of claims 1 to 4, characterized in that: A slot is formed on the lower surface of the impeller, and the magnet is embedded in the slot by bonding, thereby forming the impeller assembly.

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