Electric water pump

Abstract

The utility model provides an electric water pump, relates to the technical field of water pumps, and aims to optimize the structure of the water pump to a certain extent and reduce part cost and assembly procedures on the basis of ensuring the sealing degree of the water pump. The utility model provides an electric water pump which comprises a motor body assembly, a stator assembly, a rotor assembly, a cover body and an impeller assembly. The motor body assembly comprises a shell and a waterproof sleeve, the waterproof sleeve is arranged in the shell, the waterproof sleeve and the shell are of an integrated connection structure, and the interior of the shell is divided into a first installation cavity and a second installation cavity which are independent from each other; the stator assembly is arranged in the first mounting cavity, the cover body covers the opening of the first mounting cavity, the rotor assembly is arranged in the second mounting cavity, the impeller assembly is connected with the motor body assembly and seals the second mounting cavity, and the impeller assembly is connected with the rotor assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to an electric water pump. Background Art

[0002] Electric water pumps can deliver liquid into or out of pipes at a high pressure to the corresponding position and are widely used in various industries such as production and manufacturing. Most existing electric water pumps are driven by motors. Since the motor needs to operate in a dry and waterless space, and the transport medium of the electric water pump is liquid, a large number of seals and fastening structures are required to achieve the sealing of the motor operating space, which not only greatly increases the cost of parts, but also requires heavy assembly processes, causing inconvenience to assembly and subsequent inspection and maintenance.

[0003] Therefore, it is urgent to provide an electric water pump to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0004] The utility model aims to provide an electric water pump, which optimizes the water pump structure to a certain extent, reduces the cost of parts and assembly procedures on the basis of ensuring the sealing degree of the water pump.

[0005] The utility model provides an electric water pump, comprising a motor body assembly, a stator assembly, a rotor assembly, a cover body and an impeller assembly; the motor body assembly comprises an outer shell and a water-blocking sleeve, the water-blocking sleeve is arranged in the outer shell, and the water-blocking sleeve and the outer shell are an integrally connected structure, dividing the interior of the outer shell into a first installation cavity and a second installation cavity which are independent of each other; the stator assembly is arranged in the first installation cavity, the cover body is sealed at the opening of the first installation cavity, the rotor assembly is arranged in the second installation cavity, the impeller assembly is connected to the motor body assembly to close the second installation cavity, and the impeller assembly is connected to the rotor assembly.

[0006] Among them, the water-proof sleeve includes a positioning protrusion and a connecting portion, the positioning protrusion is columnar and is located in the first installation cavity, and forms a recessed groove in the second installation cavity; the connecting portion is formed along the circumference of the positioning protrusion and is connected to the outer shell; the inner ring of the stator assembly is in contact with the outer wall surface of the positioning protrusion, and the outer ring of the stator assembly is in contact with the inner wall surface of the outer shell.

[0007] Specifically, the inner wall surface of the shell is formed with a plurality of positioning portions, the plurality of positioning portions protrude from the inner wall surface of the shell, and the plurality of positioning portions are evenly distributed along the circumference of the inner wall surface of the shell, and the positioning portions abut against the outer wall surface of the stator assembly.

[0008] Furthermore, a grounding pin is connected to the outer wall of the stator assembly, and a support portion is formed on the inner wall of the outer shell corresponding to the position of the grounding pin. The support portion protrudes from the inner wall surface of the outer shell and abuts against the grounding pin; the height of the support portion in the axial direction of the motor body assembly is less than the length of the grounding pin.

[0009] Among them, the electric water pump provided by the utility model also includes a control board, a positioning platform is formed in the outer shell corresponding to the first installation cavity, and a first limiting column is formed on the positioning platform; a second limiting column is formed on the positioning protrusion, and the control board is mounted on the positioning platform and the positioning protrusion, and alignment holes are formed on the control board corresponding to the positions of the first limiting column and the second limiting column, and the first limiting column and the second limiting column pass through the alignment holes to limit the radial position of the control board.

[0010] Specifically, the number of the first limiting columns is at least two, and the two first limiting columns and the second limiting columns are distributed in a triangle.

[0011] Specifically, the first limiting column and the second limiting column both include a protruding portion and a plurality of limiting edges, and the plurality of limiting edges are evenly distributed along the circumference of the protruding portion.

[0012] Wherein, the impeller assembly includes a water pump volute and an impeller assembly, the impeller assembly is connected to the output end of the rotor assembly, the water pump volute is connected to the motor body assembly, and closes the second installation cavity.

[0013] Specifically, the water pump volute is formed with a first welding portion, and the motor body assembly is formed with a second welding portion at a position corresponding to the first welding portion. The first welding portion and the second welding portion are welded to connect the water pump volute to the motor body assembly.

[0014] Furthermore, a first overflow groove is formed at a position of the water pump volute corresponding to the first welding part, and a second overflow groove is formed at a position of the motor body assembly corresponding to the first overflow groove, and the first overflow groove and the second overflow groove are connected to receive the molten material generated by the first welding part and the second welding part during welding.

[0015] Compared with the prior art, the electric water pump provided by the utility model has the following advantages:

[0016] The electric water pump provided by the utility model comprises a motor body assembly, a stator assembly, a rotor assembly, a cover body and an impeller assembly; the motor body assembly comprises an outer shell and a water-blocking sleeve, the water-blocking sleeve is arranged in the outer shell, and the water-blocking sleeve and the outer shell are an integrally connected structure, dividing the interior of the outer shell into a first installation cavity and a second installation cavity which are independent of each other; the stator assembly is arranged in the first installation cavity, the cover body is sealed at the open part of the first installation cavity, the rotor assembly is arranged in the second installation cavity, the impeller assembly is connected to the motor body assembly, the second installation cavity is closed, and the impeller assembly is connected to the rotor assembly.

[0017] From this analysis, it can be seen that by making the waterproof sleeve and the outer shell an integrated connection structure, the outer shell can be divided into two independent and unconnected first installation chamber and second installation chamber through the waterproof sleeve, and the first installation chamber is closed by the cover body, so that no liquid can enter the first installation chamber, forming an independent and dry chamber.

[0018] By arranging the stator assembly in the first installation cavity and the rotor assembly in the second installation cavity, the rotor assembly can rotate relative to the stator assembly without contacting the stator assembly with the liquid, thereby ensuring the working environment of the stator assembly. Furthermore, by connecting the impeller assembly to the rotor assembly, the impeller in the impeller assembly can be driven to rotate by the rotor assembly, and the second installation cavity can be closed by the impeller assembly, thereby realizing the formation and guidance of high-pressure water flow in the impeller assembly.

[0019] Accordingly, since the present application only uses an integrated waterproof sleeve and outer shell to eliminate numerous sealing structures and fastening structures currently used, while ensuring the waterproof sealing performance, it not only reduces the number of structural parts used in the electric water pump and reduces the manufacturing cost, but also greatly reduces the complexity and difficulty of assembly and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An exploded schematic diagram of an electric water pump provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the internal structure of a motor assembly in an electric water pump provided by an embodiment of the utility model from a first perspective;

[0023] Figure 3A schematic diagram of the internal structure of the second four corners of the motor body assembly in the electric water pump provided by the embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the structure of the control panel and the motor assembly in the electric water pump provided by the embodiment of the utility model;

[0025] Figure 5 A schematic diagram of the structure of a first limiting column and a second limiting column in an electric water pump provided in an embodiment of the utility model;

[0026] Figure 6 A schematic structural diagram of a water pump volute and an outer casing in an electric water pump provided in an embodiment of the utility model.

[0027] In the figure: 1-motor body assembly; 101-waterproof sleeve; 1011-positioning protrusion; 1012-connecting part; 1013-second limiting column; 1014-reinforcing rib; 102-housing; 1021-positioning part; 1022-supporting part; 1023-positioning platform; 1024-first limiting column; 1025-protrusion; 1026-limiting edge; 1027-second welding part; 1028-second overflow groove; 1029-positioning recess; 103-first installation cavity; 2-stator assembly; 201-grounding pin; 3-rotor assembly; 4-cover; 5-impeller assembly; 6-water pump volute; 601-first welding part; 602-first overflow groove; 7-control board; 8-gasket. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0033] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0034] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0035] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0036] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0037] like Figure 1 As shown, the utility model provides an electric water pump, including a motor body assembly 1, a stator assembly 2, a rotor assembly 3, a cover body 4 and an impeller assembly; the motor body assembly 1 includes an outer shell 102 and a watertight sleeve 101, the watertight sleeve 101 is arranged in the outer shell 102, and the watertight sleeve 101 and the outer shell 102 are an integrally connected structure, which divides the interior of the outer shell 102 into a first installation cavity 103 and a second installation cavity which are independent of each other; the stator assembly 2 is arranged in the first installation cavity 103, the cover body 4 is sealed at the open part of the first installation cavity 103, the rotor assembly 3 is arranged in the second installation cavity, the impeller assembly is connected to the motor body assembly 1, the second installation cavity is closed, and the impeller assembly is connected to the rotor assembly 3.

[0038] Compared with the prior art, the electric water pump provided by the utility model has the following advantages:

[0039] The electric water pump provided by the utility model makes the waterproof sleeve 101 and the outer shell 102 an integrally connected structure, and can divide the outer shell 102 into two independent and non-interconnected first installation chamber 103 and second installation chamber through the waterproof sleeve 101, and seal the first installation chamber 103 through the cover body 4, so that no liquid can enter the first installation chamber 103, so that it can form an independent and dry chamber.

[0040] By arranging the stator assembly 2 in the first installation cavity 103 and the rotor assembly 3 in the second installation cavity, the rotor assembly 3 can be rotated relative to the stator assembly 2 without contacting the stator assembly 2 with the liquid, thereby ensuring the working environment of the stator assembly 2. Furthermore, by connecting the impeller assembly to the rotor assembly 3, the impeller in the impeller assembly can be driven to rotate by the rotor assembly 3, and the second installation cavity can be closed by the impeller assembly, thereby realizing the formation and guidance of high-pressure water flow in the impeller assembly.

[0041] Accordingly, since the present application only uses an integrated structure of the waterproof sleeve 101 and the outer shell 102, it is possible to omit numerous sealing structures and fastening structures currently used. While ensuring the waterproof sealing performance, it not only reduces the number of structural parts used in the electric water pump and reduces the manufacturing cost, but also greatly reduces the complexity and difficulty of assembly and improves the assembly efficiency.

[0042] Alternatively, if Figure 1-Figure 4 As shown, the waterproof sleeve 101 in the present application includes a positioning protrusion 1011 and a connecting portion 1012. The positioning protrusion 1011 is columnar and is located in the first installation cavity 103, and forms a recessed groove in the second installation cavity; the connecting portion 1012 is formed along the circumference of the positioning protrusion 1011 and is connected to the outer shell 102; the inner ring of the stator assembly 2 is in contact with the outer wall surface of the positioning protrusion 1011, and the outer ring of the stator assembly 2 is in contact with the inner wall surface of the outer shell 102.

[0043] Since the stator assembly 2 is annular in structure, the waterproof sleeve 101 in the present application is composed of a positioning protrusion 1011 and a connecting portion 1012. The positioning protrusion 1011 protrudes into the first installation cavity 103, so that it can cooperate with the outer shell 102 to form an annular positioning space, namely the first installation cavity 103, so that the annular stator assembly 2 can be positioned.

[0044] Correspondingly, the formed positioning protrusion 1011 can form a recessed groove in the second installation cavity, thereby enabling the installation of the rotor assembly 3, so that the stator assembly 2 and the rotor assembly 3 can correspond to each other, so as to realize the rotation of the rotor assembly 3 relative to the stator assembly 2.

[0045] Alternatively, if Figure 2-Figure 4 As shown, the inner wall surface of the shell 102 in the present application is formed with multiple positioning portions 1021, the multiple positioning portions 1021 protrude from the inner wall surface of the shell 102, and the multiple positioning portions 1021 are evenly distributed along the circumference of the inner wall surface of the shell 102, and the positioning portions 1021 are in contact with the outer wall surface of the stator assembly 2.

[0046] The positioning portion 1021 in the present application extends axially along the outer shell 102, and preferably, the positioning portion 1021 in the present application can be three or four, and the multiple positioning portions 1021 are evenly distributed along the circumference of the outer shell 102. When the stator assembly 2 is installed into the first installation cavity 103, the outer wall surface of the stator assembly 2 can abut against the positioning portion 1021, thereby realizing the radial positioning and limiting of the stator assembly 2 through the multiple evenly distributed positioning portions 1021.

[0047] Alternatively, if Figure 1-Figure 4As shown, the outer wall of the stator assembly 2 in the present application is connected to a grounding pin 201, and a support portion 1022 is formed on the inner wall of the shell 102 at a position corresponding to the grounding pin 201. The support portion 1022 protrudes from the inner wall surface of the shell 102 and abuts against the grounding pin 201; the height of the support portion 1022 in the axial direction of the motor body assembly 1 is less than the length of the grounding pin 201.

[0048] Since the outside of the stator assembly 2 is connected to a grounding pin 201, and the grounding pin 201 is small and fragile, the present application forms a support portion 1022 on the inner wall of the housing 102 at a position corresponding to the grounding pin 201 of the stator assembly 2, so that the grounding pin 201 can be supported when the stator assembly 2 is installed, thereby avoiding the problem of damage to the grounding pin 201 when the stator assembly 2 is installed. Preferably, the height of the support portion 1022 in the present application is lower than the press-fit position of the grounding pin 201, thereby achieving the fixing effect on the grounding pin 201 and not affecting the installation of the grounding pin 201.

[0049] It should be noted that the housing 102 in the present application is also provided with a positioning recess 1029. Figure 3 As shown, there are four positioning recesses 1029 in the present application, and they are evenly distributed on the inner wall surface of the outer shell 102. The positioning recesses 1029 can realize the uniqueness of the installation direction of the stator assembly 2, so that the grounding pin 201 on the stator assembly 2 can always correspond to the support portion 1022.

[0050] Alternatively, if Figure 1 Combination Figure 4 As shown, the electric water pump provided by the utility model also includes a control board 7, a positioning platform 1023 is formed in the outer shell 102 corresponding to the first installation cavity 103, and a first limiting column 1024 is formed on the positioning platform 1023; a second limiting column 1013 is formed on the positioning protrusion 1011, and the control board 7 is mounted on the positioning platform 1023 and the positioning protrusion 1011, and alignment holes are formed at positions corresponding to the first limiting column 1024 and the second limiting column 1013 on the control board 7, and the first limiting column 1024 and the second limiting column 1013 pass through the alignment holes to limit the radial position of the control board 7.

[0051] The control board 7 can realize the control of the start and stop and speed of the electric water pump, and the present application can support the control board 7 through the positioning platform 1023 formed in the first installation cavity 103 corresponding to the outer shell 102 and the positioning protrusion 1011 included in the waterproof sleeve 101, and the first limiting column 1024 formed on the positioning platform 1023, the second limiting column 1013 formed on the positioning protrusion 1011, and the corresponding alignment holes formed on the control board 7 can realize the radial limitation of the control board 7, so as to avoid the control board 7 from moving during use and causing damage to the circuit.

[0052] Preferably, if Figure 2-Figure 4 As shown, the number of the first limiting posts 1024 in the present application is at least two, and the two first limiting posts 1024 and the second limiting posts 1013 are distributed in a triangle.

[0053] The second limiting column 1013 in the present application is located at the center of the positioning protrusion 1011, and in order to ensure the strength of the second limiting column 1013, a plurality of reinforcing ribs 1014 are formed on the circumference of the second limiting column 1013, thereby being able to support the second limiting column 1013.

[0054] It can be understood that the present application can form a triangular structure through two first limiting columns 1024 and one second limiting column 1013, thereby being able to achieve stable support and limiting of the control board 7 and avoid the problem of radial movement of the control board 7.

[0055] It should be noted here that the number of two first limit columns 1024 in the present application is only one of the preferred implementations. Without affecting the integrated components and control functions on the control board 7, more first limit columns 1024 can be formed on the positioning platform 1023.

[0056] More preferably, if Figure 5 As shown, the first limiting column 1024 and the second limiting column 1013 in the present application both include a protruding portion 1025 and a plurality of limiting edges 1026 , and the plurality of limiting edges 1026 are evenly distributed along the circumference of the protruding portion 1025 .

[0057] By forming a plurality of limiting ridges 1026 on the circumference of the protrusion 1025, the radial dimension of the protrusion 1025 can be increased, and the limiting ridges 1026 can improve the fault tolerance of the first limiting column 1024 and the second limiting column 1013 to a certain extent. When the first limiting column 1024 and the second limiting column 1013 have a slight deviation from the alignment holes on the control board 7, the connection stability between the control board 7 and the first limiting column 1024 and the second limiting column 1013 can be achieved by compressing the limiting ridges 1026 to a certain extent.

[0058] It should be noted here that the first limit column 1024 and the second limit column 1013 in the present application are both made of heat-meltable materials, such as plastic materials. After the first limit column 1024 and the second limit column 1013 pass through the corresponding alignment holes of the control board 7, the ends of the first limit column 1024 and the second limit column 1013 are melted by hot melting to form mushroom-shaped limit heads, thereby enabling further positioning of the control board 7.

[0059] Alternatively, if Figure 1 As shown, the impeller assembly in the present application includes a water pump volute 6 and an impeller assembly 5, the impeller assembly 5 is connected to the output end of the rotor assembly 3, the water pump volute 6 is connected to the motor body assembly 1, and the second installation cavity is closed.

[0060] The impeller assembly 5 is connected to the rotor assembly 3. When the rotor assembly 3 rotates, it can drive the impeller assembly 5 to rotate, so that the liquid in the second installation cavity can form a water flow, and the purpose of being discharged from the water outlet of the water pump volute 6 is achieved.

[0061] It is understandable that the water pump volute 6 in the present application is connected to the housing 102 of the motor body assembly 1 to close the second installation cavity. Preferably, a gasket 8 is further provided between the water pump volute 6 and the impeller assembly 5 in the present application, and the gasket 8 can make the connection between the water pump volute 6 and the impeller assembly 5 more stable.

[0062] Alternatively, if Figure 6 As shown, the water pump volute 6 in the present application is formed with a first welding portion 601, and the motor body assembly 1 is formed with a second welding portion 1027 at a position corresponding to the first welding portion 601. The first welding portion 601 and the second welding portion 1027 are welded to connect the water pump volute 6 to the motor body assembly 1.

[0063] The edges of the water pump volute 6 and the outer shell 102 in the present application are both formed with an annular lap joint, through which the water pump volute 6 and the outer shell 102 can be stably connected. By correspondingly forming the first welding portion 601 and the second welding portion 1027 on the lap joint, when it is necessary to connect the water pump volute 6 and the outer shell 102, the first welding portion 601 and the second welding portion 1027 can be hot-melted to achieve a fixed connection between the water pump volute 6 and the outer shell 102.

[0064] Accordingly, the first welding portion 601 in the present application slightly protrudes from the plane where the lap joint of the water pump volute 6 is located, and accordingly, the second welding portion 1027 slightly protrudes from the plane where the lap joint of the outer shell 102 is located, so that after welding, the water pump volute 6 and the outer shell 102 can be tightly fitted.

[0065] It can be understood that the water pump volute 6 and the outer casing 102 in the present application are welded by hot melt welding. Since the first welding part 601 and the second welding part 1027 in the present application are slightly protruding from the plane where the corresponding lap joint is located, overflow is easily caused during hot melting.

[0066] like Figure 6 As shown, the present application forms a first overflow groove 602 at the position of the water pump volute 6 corresponding to the first welding part 601, and forms a second overflow groove 1028 at the position of the motor body assembly 1 corresponding to the first overflow groove 602. The first overflow groove 602 and the second overflow groove 1028 are connected to receive the molten material generated by the first welding part 601 and the second welding part 1027 during welding, thereby avoiding the problem of overflow during hot melt welding and further increasing the connection strength between the water pump volute 6 and the outer casing 102 after being fixed with the welding material received by the first overflow groove 602 and the second overflow groove 1028.

[0067] It is understandable that if Figure 6 As shown, the first overflow groove 602 and the second overflow groove 1028 in the present application are both located at the outer ring, so that they can fully receive the overflow after the first welding part 601 and the second welding part 1027 are melted, so that the docking position of the water pump volute 6 and the outer casing 102 after welding can be cleaner and more beautiful.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric water pump, characterized in that: It includes a motor body assembly, a stator assembly, a rotor assembly, a cover body and an impeller assembly; The motor body assembly includes a shell and a waterproof sleeve, wherein the waterproof sleeve is arranged in the shell, and the waterproof sleeve and the shell are an integrally connected structure, and the interior of the shell is divided into a first installation cavity and a second installation cavity which are independent of each other; The stator assembly is arranged in the first installation cavity, the cover body covers the open opening of the first installation cavity, the rotor assembly is arranged in the second installation cavity, the impeller assembly is connected to the motor body assembly, closing the second installation cavity, and the impeller assembly is connected to the rotor assembly.

2. The electric water pump according to claim 1, characterized in that: The waterproof sleeve includes a positioning protrusion and a connecting portion, the positioning protrusion is columnar and is located in the first installation cavity, and forms a concave groove in the second installation cavity; The connecting portion is formed along the circumference of the positioning protrusion and is in contact with the housing; The inner ring of the stator assembly fits with the outer wall surface of the positioning protrusion, and the outer ring of the stator assembly fits with the inner wall surface of the outer shell.

3. The electric water pump according to claim 1, characterized in that: The inner wall surface of the shell is formed with a plurality of positioning portions, the plurality of positioning portions protrude from the inner wall surface of the shell, and the plurality of positioning portions are evenly distributed along the circumference of the inner wall surface of the shell, and the positioning portions abut against the outer wall surface of the stator assembly.

4. The electric water pump according to claim 1, characterized in that: The outer wall of the stator assembly is connected to a grounding pin, and the inner wall of the shell is formed with a supporting portion at a position corresponding to the grounding pin, the supporting portion protrudes from the inner wall surface of the shell and abuts against the grounding pin; The height of the support portion in the axial direction of the motor body assembly is smaller than the length of the grounding pin.

5. The electric water pump according to claim 2, characterized in that: It also includes a control board, a positioning platform is formed in the housing corresponding to the first installation cavity, and a first limiting column is formed on the positioning platform; A second limiting column is formed on the positioning protrusion, the control plate is mounted on the positioning platform and the positioning protrusion, and alignment holes are formed on the control plate at positions corresponding to the first limiting column and the second limiting column, the first limiting column and the second limiting column pass through the alignment holes to limit the radial position of the control plate.

6. The electric water pump according to claim 5, characterized in that: The number of the first limiting columns is at least two, and the two first limiting columns and the second limiting columns are distributed in a triangle.

7. The electric water pump according to claim 5, characterized in that: The first limiting column and the second limiting column both include a protruding portion and a plurality of limiting edges, and the plurality of limiting edges are evenly distributed along the circumference of the protruding portion.

8. The electric water pump according to claim 1, characterized in that: The impeller assembly includes a water pump volute and an impeller assembly. The impeller assembly is connected to the output end of the rotor assembly. The water pump volute is connected to the motor body assembly and closes the second installation cavity.

9. The electric water pump according to claim 8, characterized in that: The water pump volute is formed with a first welding portion, and the motor body assembly is formed with a second welding portion at a position corresponding to the first welding portion. The first welding portion and the second welding portion are welded to connect the water pump volute to the motor body assembly.

10. The electric water pump according to claim 9, characterized in that: The water pump volute is formed with a first overflow groove at a position corresponding to the first welding part, and the motor body assembly is formed with a second overflow groove at a position corresponding to the first overflow groove. The first overflow groove and the second overflow groove are connected to receive the molten material generated by the first welding part and the second welding part during welding.

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