A rotor outer seal structure, a rotor seal structure, a rotating assembly of an electric water pump and an electric water pump

Abstract

The utility model discloses a rotor outside seal structure, rotor seal structure, electric water pump's rotation subassembly and electric water pump, rotor outside seal structure is used for sealing the outside of rotor, including seal cup and body, the seal cup is formed by metal material stamping drawing and is equipped with the opening along Z axle direction, and the seal cup includes the cup wall and the cup bottom that are connected as one, and the body is made of plastic material and is embedded injection molding with seal cup, and the body is equipped with first limit wall and second limit wall along Z axle direction, and the first limit wall is along Z axle direction and is towards the cup bottom and is in abutment with the top of cup wall, and the first limit wall still stretches into the opening and is perpendicular to Z axle direction and is in abutment with the inner surface of cup wall, and the second limit wall is along Z axle direction and is towards the first limit wall and is in abutment with the cup bottom, and the seal cup and the body form the cavity that is suitable for accommodating rotor. When the application is applied in electric water pump, the power density of brushless motor is big.

Description

Technical Field

[0001] This utility model relates to the field of water pumps, specifically to a rotor outer sealing structure, a rotor sealing structure, a rotating component of an electric water pump, and an electric water pump. Background Technology

[0002] Electric water pumps are widely used in the cooling water circulation systems of the automotive industry. An electric water pump generally includes a housing, pump shaft, brushless motor, control board, and impeller. The housing has an impeller cavity, rotor cavity, and control board arranged sequentially along its axial direction. The housing also has an inlet and an outlet communicating with the impeller cavity. The impeller cavity and rotor cavity are axially connected, while the control board is isolated from the rotor cavity. The pump shaft extends axially and enters both the impeller and rotor cavities. The impeller is located in the impeller cavity and rotates relative to the pump shaft. The rotor of the brushless motor is located in the rotor cavity, and the stator of the brushless motor is arranged around the rotor cavity and fixed to the housing. The control board, located within the control board, controls the stator. The pump shaft, rotor, and impeller are integrally fixed and driven by the brushless motor, causing water to flow from the inlet through the impeller and out the outlet.

[0003] In practice, it has been found that the power density of brushless motors is low when the rotor and impeller are integrally fixed. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide a rotor outer sealing structure, a rotor sealing structure, a rotating component of an electric water pump and an electric water pump, which, when applied in an electric water pump, has a high power density of brushless motor.

[0005] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0006] Technical Solution 1 and its related embodiments provide a rotor outer sealing structure for sealing the outer side of a rotor, comprising: a sealing cup formed by stamping and stretching of a metal material and having an opening along the Z-axis direction, the sealing cup including a cup wall and a cup bottom integrally connected to each other; and a body made of plastic material and injection molded with the sealing cup insert, the body having a first limiting wall and a second limiting wall arranged along the Z-axis direction, the first limiting wall abutting the top of the cup wall towards the cup bottom along the Z-axis direction, the first limiting wall also extending into the opening and abutting the inner surface of the cup wall perpendicular to the Z-axis direction, the second limiting wall abutting the cup bottom towards the first limiting wall along the Z-axis direction; the sealing cup and the body form a cavity suitable for accommodating the rotor.

[0007] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the bottom of the cup is provided with a bottom wall and a protrusion. The protrusion is arranged around the bottom wall and connected to the cup wall. The protrusion protrudes from the bottom wall away from the first limiting wall along the Z-axis direction. The second limiting wall abuts against the bottom wall along the Z-axis direction and abuts against the protrusion in a direction perpendicular to the Z-axis direction.

[0008] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the body is further provided with a first connecting part that extends along the Z-axis and connects the first limiting wall and the second limiting wall. The first connecting part passes through the rotor so that the rotor is fixed relative to the body.

[0009] Based on technical solution two, there is also technical solution four. In technical solution four and its related embodiments, the interior of the protrusion forms an annular space, the body is further provided with an annular body and a second connecting part, the annular body fills the annular space, and the second connecting part connects the first limiting wall and the annular body and fits the inner surface of the cup wall.

[0010] Technical Solution 5 and its related embodiments provide a rotor sealing structure, including a rotor outer sealing structure and a rotating sleeve as described in any one of Technical Solutions 1 to 4, wherein the rotating sleeve is engaged with and fixed to the body to seal the inner side of the rotor.

[0011] Based on technical solution five, there is also technical solution six. In technical solution six and its related embodiments, the rotating sleeve is made of metal and is injection molded with the body and the sealing cup insert.

[0012] Based on technical solution six, technical solution seven is also provided. In technical solution seven and its related embodiments, the outer wall of the rotating sleeve protrudes and is provided with a limiting block extending in the Z-axis direction. The first limiting wall and the second limiting wall also abut against the limiting block relative to each other in the Z-axis direction.

[0013] Based on technical solution seven, technical solution eight is also provided. In technical solution eight and its related embodiments, the two ends of the rotating sleeve are respectively provided with annular walls that protrude from the first limiting wall and the second limiting wall along the Z-axis direction. The first limiting wall and the second limiting wall are also adapted to abut against the outer surface of the annular wall in the direction perpendicular to the Z-axis direction. Each annular wall is provided with at least one extension groove that penetrates through and communicates with the inner cavity of the rotating sleeve in the direction perpendicular to the Z-axis direction.

[0014] Based on technical solution five, there is also technical solution nine. In technical solution nine and its related embodiments, the rotating sleeve is integrated with the main body.

[0015] Technical solution ten and its related embodiments provide a rotating assembly of an electric water pump, including a rotor and a rotor sealing structure as described in any one of technical solutions five to nine, wherein the rotor is housed in the cavity and the rotating sleeve is located inside the rotor.

[0016] Based on technical solution ten, there is also technical solution eleven. In technical solution eleven and its related embodiments, the main body is further provided with an impeller part, and the impeller part and the first limiting wall are arranged along the Z-axis direction.

[0017] Technical solution 12 and its related embodiments provide a rotating assembly of an electric water pump, characterized in that it includes a rotor and a rotating sleeve as described in technical solution 4, wherein the rotating sleeve is engaged with and fixed to the body to seal the inner side of the rotor, the rotor includes an iron core surrounding the rotating sleeve and at least two magnets fixed to the iron core and located outside the iron core, the outer edge of the magnets is close to the cup wall, and a gap is formed between adjacent magnets for the second connecting portion to pass through.

[0018] Technical solution thirteen provides an electric water pump, including a rotor assembly as described in any one of technical solutions ten to twelve.

[0019] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0020] Through continuous observation, experimentation, and research, the applicant has determined that the reason for the technical problem of "low power density of brushless motor after rotor and impeller are fixedly connected" in the existing technical solution is that when the electric water pump is in use, the rotor is immersed in the coolant. Since the rotor core is usually made of silicon steel sheets, it is prone to rust and corrosion when directly exposed to the coolant. Therefore, the existing technology usually integrates the rotor core and permanent magnet with the impeller through injection molding to avoid core rust. However, due to the minimum wall thickness requirement during injection molding, the injection material must be greater than the minimum wall thickness to ensure that the injection material can circulate throughout the entire part without causing material shortages or cracking. As a result, the injection material thickness of the outer ring of the core is relatively thick, leading to a larger magnetic gap between the stator and rotor of the brushless motor, which is not conducive to improving the power density of the brushless motor.

[0021] In technical solution one and its preferred embodiments, since the body is made of plastic and injection molded with the sealing cup insert, the first limiting wall abuts against the top of the cup wall along the Z-axis towards the bottom of the cup. The first limiting wall also extends into the opening and abuts against the inner surface of the cup wall perpendicular to the Z-axis. The second limiting wall abuts against the bottom of the cup along the Z-axis towards the first limiting wall. The sealing cup and the body form a cavity suitable for accommodating the rotor. The outer edges of the cavity are sealed. Therefore, when the rotor is accommodated in the cavity, the outer side of the rotor is sealed and fixedly connected to the cavity. Since the sealing cup is formed by stamping and stretching of metal, the metal structure has high strength and a long service life. The long, stamped and stretched process allows for a smaller thickness of the metal cup wall, which helps reduce the magnetic gap between the rotor and stator when the rotor is used in an electric water pump, thus reducing magnetic leakage and improving the power density of the brushless motor. The sealing cup consists of an integral cup wall and a cup bottom. Compared to a separate structure, the integral design is easier to process. Furthermore, during installation, it is only necessary to fit the sealing cup around the rotor and then injection mold the unit formed by the sealing cup and rotor with the body insert. The installation steps are fewer and the processing procedures are simpler, which greatly reduces costs.

[0022] In the second technical solution and its preferred embodiment, the protrusion is designed to facilitate the second limiting wall to abut against the protrusion in a direction perpendicular to the Z-axis, thereby making the second limiting wall abut against the bottom of the sealing cup in a direction perpendicular to the Z-axis as well. Therefore, both ends of the sealing cup in the Z-axis direction abut against the body in a direction perpendicular to the Z-axis, and the connection between the sealing cup and the body is tighter.

[0023] In the third technical solution and its preferred embodiment, the body is further provided with a first connecting part that extends along the Z-axis and connects the first limiting wall and the second limiting wall. The first connecting part penetrates the rotor so that the rotor is fixed relative to the body. The setting of the first connecting part not only improves the connection strength between the rotor and the body, but also increases the connection strength between the first limiting wall and the second limiting wall, thereby ensuring the reliability of the connection between the rotor and the body.

[0024] In the fourth technical solution and its preferred embodiment, in practical applications, the bottom of the cup supports the rotor, and the cup wall surrounds the outer periphery of the rotor. However, the outer periphery of the rotor near the bottom of the cup cannot fit well with the bottom of the cup, thus a gap usually forms between the rotor and the bottom of the cup. This gap can easily lead to misjudgment during airtightness testing when the rotor is used in an electric water pump, and the gap also makes the connection between the rotor and the bottom of the cup unreliable. In the fourth technical solution and its preferred embodiment, the interior of the protrusion forms an annular space, and the body also has an annular body and a second connecting part. The annular body fills the annular space, and the second connecting part connects the first limiting wall and the annular body and fits against the inner surface of the cup wall. Therefore, when the rotor is housed in the cavity, the gap between the rotor and the bottom of the cup, i.e., the annular space, can be filled by the annular body, resulting in better airtightness. The second connecting part, which connects the annular body and the first limiting wall, further strengthens the strength of the cup body. In practical applications, the second connecting part penetrates the gap between adjacent magnets in the twelfth technical solution, so the second connecting part can also limit the rotor radially, thereby improving the connection strength between the rotor and the body.

[0025] The fifth technical solution has the technical advantages of any one of the first to fourth technical solutions, wherein the rotating sleeve is combined with the body and fixed to seal the inner side of the rotor. Thus, both the inner and outer sides of the rotor are sealed, making it less likely to be exposed to the coolant and resulting in a longer service life.

[0026] In the sixth technical solution and its preferred embodiment, the rotating sleeve is made of metal and is injection molded with the body and the sealing cup insert. This is a preferred embodiment of the fifth technical solution. The rotating sleeve is made of metal, and the metal part has high structural strength and long service life.

[0027] In the seventh technical solution and its preferred embodiment, a limiting block protrudes from the outer wall of the rotating sleeve, and the first limiting wall and the second limiting wall abut against each other along the Z-axis direction, which increases the connection strength between the body and the rotating sleeve and is more conducive to the relative fixation of the rotor and the rotating sleeve along the Z-axis direction.

[0028] In the eighth technical solution and its preferred embodiment, the extension groove can be used to position the rotating sleeve during the mold opening process. Furthermore, when applied to the twelfth technical solution, it allows the inner cavity of the rotating sleeve to communicate with the rotor cavity for rapid cooling, preventing dry friction between the rotating sleeve and the pump shaft. Additionally, it can be used to position the rotating sleeve relative to the iron core, facilitating magnetization of the iron core. The first and second limiting walls are also adapted to abut against the outer surface of the ring wall in a direction perpendicular to the Z-axis, increasing the connection strength between the body and the rotating sleeve and improving the sealing performance of the inner side of the rotor.

[0029] In the ninth technical solution and its preferred embodiment, the rotating sleeve is integrated with the body. At this time, the rotating sleeve is made of non-metallic material, which has good lubricity and rust prevention, and a long service life. It can also simultaneously form the outer sealing structure and the inner sealing structure of the rotor, reducing the steps of installing the rotating sleeve and making the processing more convenient.

[0030] The tenth technical solution and its preferred embodiments have the technical advantages of any one of the fifth to ninth technical solutions.

[0031] In the eleventh technical solution and its preferred embodiment, the main body is also provided with an impeller section. The impeller section and the first limiting wall are arranged along the Z-axis direction. When the impeller rotates, it can synchronously drive the rotor to rotate, making the structure simpler and more practical.

[0032] The twelfth technical solution and its preferred embodiment have the technical advantages of the fourth technical solution. In addition, the rotor includes an iron core surrounding the rotating sleeve and at least two magnets fixed to the iron core and located outside the iron core. The outer edge of the magnet is close to the cup wall, and a gap is formed between adjacent magnets for the second connecting part to pass through. On the one hand, the second connecting part passes through the gap between adjacent magnets, which can limit the rotor in the direction perpendicular to the Z-axis. On the other hand, compared with the solution where the second connecting part is annular and located between the rotor and the cup wall of the sealing cup, it is also beneficial to reduce the plastic wall thickness between the rotor and the stator, thereby reducing the magnetic gap between the rotor and the stator and improving the power density of the brushless motor.

[0033] The thirteenth technical solution and its preferred embodiments have the technical advantages of any one of the tenth to twelfth technical solutions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a top view of the electric water pump according to an embodiment of this application;

[0036] Figure 2 for Figure 1 Sectional view along the AA direction;

[0037] Figure 3 An exploded view of the rotating component in an embodiment of this application. Figure 1 ;

[0038] Figure 4 An exploded view of the rotating component in an embodiment of this application. Figure 2 ;

[0039] Figure 5 This is a top view of the rotor, rotating sleeve, and sealing cup according to an embodiment of this application;

[0040] Figure 6 for Figure 5 Sectional view in the BB direction;

[0041] Figure 7 This is a top view of the rotating assembly according to an embodiment of this application;

[0042] Figure 8 for Figure 7 Sectional view in the CC direction;

[0043] Figure 9 This is a bottom view of the rotating assembly according to an embodiment of this application;

[0044] Figure 10 for Figure 9 Sectional view in the DD direction.

[0045] Explanation of key figure labels:

[0046] Housing 10; Upper housing 11; Impeller cavity 01; Rotor cavity 02; Electrical control cavity 03; Middle housing 12; Lower housing 13; Pump shaft 20; Stator 30; Rotor 40; Iron core 41; Receiving groove 411; First through hole 412; Positioning groove 413; Second through hole 414; Magnet 42; Rotating sleeve 50; Limiting block 51; Annular wall 52; Extension groove 521; Third through hole 04; Rotor outer sealing structure 100; Sealing cup 60; Cup wall 61; Cup bottom 62; Bottom wall 621; Protrusion 622; Annular space 623; First clearance hole 624; Second clearance hole 625; Body 70; First limiting wall 71; Second limiting wall 72; First connecting wall 73; Annular body 74; Second connecting wall 75; Impeller part 76; Electrical control board 80. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0048] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0049] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0050] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0051] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0052] In the claims and description, unless otherwise specified, the term "have" means that a technical feature that follows is part of a technical feature that precedes it.

[0053] Unless otherwise specified in the claims and description, the term "stator" includes not only the stator as understood by a person skilled in the art, but also the windings. That is, the stator includes a stator section and a winding section.

[0054] Unless otherwise specified in the claims and description, the term "watertight" refers to a liquid seal, which is commonly known to those skilled in the art to be achieved by conventional means such as sealing rings or sealing cups.

[0055] Unless otherwise specified in the claims and description, the term "insert injection molding" refers to a process in which two parts are tightly joined together and cannot be disassembled after injection molding by inserting components during the injection process.

[0056] Unless otherwise specified in the claims and description, the Z-axis direction refers to the direction of extension of the rotor's axis of rotation, and the direction perpendicular to the Z-axis direction refers to the radial direction of the rotor's axis of rotation.

[0057] See Figure 1-2 , Figure 1-2 An electric water pump is shown, which includes a housing 10, a pump shaft 20, a stator 30, a rotating assembly, and an electrical control board 80.

[0058] like Figure 2 As shown, the housing 10 includes an upper housing 11, a middle housing 12, and a lower housing 13.

[0059] like Figure 2 As shown, the upper housing 11 has an impeller cavity 01, an inlet, and an outlet. The impeller cavity 01 opens downwards, the inlet connects to the top of the impeller cavity 01 along the Z-axis, and the outlet connects tangentially to the impeller cavity 01. The middle housing 12 has a rotor cavity 02. The rotor cavity 02 opens upwards and has side walls. The upper housing 11 and the middle housing 12 are watertightly connected by a sealing ring and bolts. After the upper housing 11 and the middle housing 12 are fixedly connected, the impeller cavity 01 connects to the rotor cavity 02 along the Z-axis. The lower housing 13 is fixedly connected to the middle housing 12 by bolts. After the lower housing 13 and the middle housing 12 are fixedly connected, they enclose an electrical control cavity 03. The electrical control cavity 03 is adjacent to the rotor cavity 02 and is located away from the impeller cavity 01 along the Z-axis.

[0060] like Figure 2 As shown, the first end of the pump shaft 20 extends into the impeller cavity 01 and faces the water inlet along the Z-axis direction, while the second end of the pump shaft 20 extends into the rotor cavity 02.

[0061] like Figure 2 As shown, the stator 30 includes a stator section and a winding section. The stator 30 is fixedly connected to the intermediate housing 12 and surrounds the rotor cavity 02. The intermediate housing 12 also surrounds the stator 30. The stator 30 is watertightly isolated from the rotor cavity 02.

[0062] like Figure 2 As shown, the rotating assembly includes a rotor 40, a rotating sleeve 50, and a rotor outer sealing structure 100.

[0063] See also Figure 3-5 The rotor 40 includes an iron core 41 surrounding the rotating sleeve 50 and at least two magnets 42 fixed to the iron core 41 and located outside the iron core 41. Adjacent magnets 42 are spaced apart. The outer side of the iron core 41 is provided with receiving grooves 411, which are equal in number to the number of magnets 42 and correspond one-to-one with the openings facing radially outward. The magnets 42 are accommodated in the receiving grooves 411. The middle part of the iron core 41 is provided with a first through hole 412 and at least two positioning grooves 413 communicating with the first through hole 412. Each positioning groove 413 is located radially outward of the first through hole 412 and is arranged circumferentially. The interior of the iron core 41 is also provided with at least two second through holes 414 arranged circumferentially and penetrating along the Z-axis direction. Each second through hole 414 is located radially outward of each positioning groove 413 and is radially offset from it. Figure 5 In this design, there are three positioning slots 413 and three through holes 414. However, it should be understood that the number of positioning slots 413 and two through holes 414 can be increased as needed.

[0064] The rotating sleeve 50 and the rotor outer sealing structure 100 cooperate to form a rotor sealing structure. Specifically, as follows: Figure 2 As shown, the rotating sleeve 50 is sleeved on the pump shaft 20 and has a clearance fit with the pump shaft 20. In this embodiment, the rotating sleeve 50 is made of metal. Figure 3-4 As shown, the outer wall of the rotating sleeve 50 has a protruding limiting block 51 extending along the Z-axis direction, such as... Figure 5 As shown, the rotating sleeve 50 can be inserted into the first through hole 412 of the rotor 40, and the limiting block 51 can be installed into the positioning groove 413, forming a third through hole 04 between the limiting block 51 and the positioning groove 413. The cooperation between the limiting block 51 and the positioning groove 413 can achieve an anti-rotation fit between the rotor 40 and the rotating sleeve 50. See also Figure 3-4 The upper and lower ends of the rotating sleeve 50 are respectively provided with annular walls 52, and at least one extension groove 521 is provided on the annular wall 52, which penetrates through and communicates with the inner cavity of the rotating sleeve 50 in a direction perpendicular to the Z-axis.

[0065] like Figure 3-4 As shown, the rotor outer sealing structure 100 is used to seal the outer side of the rotor 40, and includes a sealing cup 60 and a body 70.

[0066] like Figure 3-4 and Figure 6 As shown, the sealing cup 60 is formed by stamping metal and has an opening along the Z-axis. The sealing cup 60 includes a cup wall 61 and a cup bottom 62 that are integrally connected. The cup bottom 62 has a bottom wall 621 and a protrusion 622. The protrusion 622 is arranged around the bottom wall 621 and connects with the cup wall 61. The protrusion 622 protrudes from the cup opening of the sealing cup 60 along the Z-axis and forms an annular space 623 inside the protrusion 622. The bottom wall 621 of the cup bottom 62 has a first clearance hole 624 in the middle, corresponding to the first through hole 412 and the positioning groove 413 of the iron core 41. The bottom wall 621 also has a second clearance hole 625 corresponding to the second through hole 414 of the iron core 41.

[0067] like Figure 7-8 As shown, the body 70 is made of plastic and is injection molded into the sealing cup 60. The body 70 is provided with a first limiting wall 71 and a second limiting wall 72 along the Z-axis direction. The first limiting wall 71 abuts against the top of the cup wall 61 towards the bottom 62 of the cup along the Z-axis direction. The first limiting wall 71 also extends into the opening and abuts against the inner surface of the cup wall 61 perpendicular to the Z-axis direction. The second limiting wall 72 abuts against the bottom 62 of the cup along the Z-axis direction towards the first limiting wall 71. In this embodiment, the second limiting wall 72 abuts against the bottom wall 621 along the Z-axis direction and abuts against the protrusion 622 perpendicular to the Z-axis direction. The first limiting wall 71 and the second limiting wall 72 also abut against the limiting block 51 opposite to each other along the Z-axis direction.

[0068] See also Figure 8The body 70 also has a first connecting portion extending along the Z-axis and connecting the first limiting wall 71 and the second limiting wall 72. The first connecting portion penetrates the rotor 40 to fix the rotor 40 relative to the body 70. In this embodiment, the first connecting portion is formed by a plurality of first connecting walls 73 penetrating the second through hole 414 and the third through hole 04. The body 70 also has an annular body 74 and a second connecting portion. The annular body 74 fills the annular space 623. The second connecting portion connects the first limiting wall 71 and the annular body 74 and fits against the inner surface of the cup wall 61. In this embodiment, see [reference needed]. Figure 9-10 The second connection is formed by a plurality of second connection walls 75 that penetrate the intervals of adjacent magnets 42.

[0069] See Figure 10 The main body 70 also includes an impeller portion 76, which is arranged along the Z-axis with the first limiting wall 71 and located above the first limiting wall 71. (See figure) Figure 2 The impeller portion 76 rotates relative to the pump shaft 20 within the impeller cavity 01 about the rotation axis defined by the pump shaft 20. The electric water pump pressurizes the water or liquid flow input from the inlet and outputs it to the outlet through the rotation of the impeller portion 76. In this embodiment, when the impeller portion 76 rotates in the impeller cavity 01, a high-pressure zone is formed between the impeller portion 76 and the cavity wall of the impeller cavity 01. Specifically, a gap exists between the outer edge of the impeller portion 76 and the side wall of the impeller cavity 01, and this gap forms the high-pressure zone. Correspondingly, when the impeller portion 76 rotates in the impeller cavity 01, a low-pressure zone is formed in the area near the inlet. When the electric water pump is used to establish a circulating water flow, the rotation of the impeller portion 76 causes the pressure at the outlet to be higher than the pressure at the inlet, causing the circulating water pump to return the water from the outlet to the inlet.

[0070] During the assembly of the rotating assembly, the iron core 41 is fitted into the rotating sleeve 50, and the limiting block 51 of the rotating sleeve 50 is inserted into the positioning groove 413, forming a third through hole 04 between the limiting block 51 and the positioning groove 413. The magnet 42 is placed in the receiving groove 411 of the iron core 41, and the sealing cup 60 is fitted over the rotor 40 from bottom to top, with the outer edge of the magnet 42 close to the cup wall 61. Then, the rotor 40 and the sealing cup 60 are injection molded as an insert with the body 70 insert to form a single piece. See here for further details. Figure 8 and Figure 10The sealing cup 60 and the body 70 form a cavity suitable for accommodating the rotor 40. The first limiting wall 71 forms the upper cavity wall, the cup bottom 62 forms the lower cavity wall, and the cup wall 61 forms the outer cavity wall. The rotor 40 is housed within the cavity. The rotating sleeve 50 engages with and is fixed to the body 70 to seal the inner side of the rotor 40. In this embodiment, the rotating sleeve 50 is injection molded with the body 70 and the sealing cup 60 as inserts. However, it should be understood that the rotating sleeve 50 can also be integrally connected to the body 70. The two ends of the rotating sleeve 50 are respectively provided with annular walls 52 protruding from the first limiting wall 71 and the second limiting wall 72 along the Z-axis direction, allowing the extension groove 521 to communicate with the rotor cavity 02. The first limiting wall 71 and the second limiting wall 72 are also adapted to abut against the outer surface of the annular wall 52 along a direction perpendicular to the Z-axis. The protrusion 622 protrudes from the bottom wall 621 away from the first limiting wall 71 along the Z-axis direction. The outer edge of the magnet 42 is close to the cup wall 61, and a gap is formed between adjacent magnets 42 for the second connecting portion to pass through. The first connecting walls 73 of the first connecting portion and the second connecting walls 75 of the second connecting portion are radially offset from each other.

[0071] like Figure 2 As shown, the electronic control board 80 is installed inside the electronic control cavity 03 and electrically connected to the stator 30 to control the stator 30, enabling the brushless motor formed by the stator 30 and the rotor 40 to start, stop, and adjust its speed. In practical applications, the electronic control board 80 is also connected to external terminals via leads passing through the lower housing 13 to obtain power and control signals from the outside.

[0072] In this embodiment, the body 70 is made of plastic and injection molded with the sealing cup 60 insert. The first limiting wall 71 abuts against the top of the cup wall 61 along the Z-axis towards the bottom 62 of the cup. The first limiting wall 71 also extends into the opening and abuts against the inner surface of the cup wall 61 perpendicular to the Z-axis. The second limiting wall 72 abuts against the bottom 62 of the cup along the Z-axis towards the first limiting wall 71. The sealing cup 60 and the body 70 form a cavity suitable for accommodating the rotor 40. The outer edges of the cavity are sealed. Therefore, when the rotor 40 is accommodated in the cavity, the outer side of the rotor 40 is sealed and fixedly connected to the cavity. Since the sealing cup 60 is formed by stamping and stretching of metal, the metal part has high structural strength and long service life. The length and the stretching process of the stamping process allow for a smaller thickness of the metal cup wall 61. This helps reduce the magnetic gap between the rotor 40 and the stator 30 when the rotor 40 is used in an electric water pump, which helps reduce magnetic leakage and thus improves the power density of the brushless motor. The sealing cup 60 includes an integral cup wall 61 and a cup bottom 62. Compared with a separate structure, the integral design is easier to process. In addition, during installation, it is only necessary to fit the sealing cup 60 around the rotor 40 and then insert the unit formed by the sealing cup 60 and the rotor 40 into the body 70 by injection molding. The installation steps are fewer and the processing procedures are simpler, which greatly reduces the cost.

[0073] In this embodiment, the protrusion 622 is provided so that the second limiting wall 72 abuts against the protrusion 622 in the direction perpendicular to the Z-axis, thereby making the second limiting wall 72 abut against the bottom 62 of the sealing cup 60 in the direction perpendicular to the Z-axis. Therefore, both ends of the sealing cup 60 in the Z-axis direction abut against the body 70 in the direction perpendicular to the Z-axis, and the connection between the sealing cup 60 and the body 70 is tighter.

[0074] In this embodiment, the body 70 is further provided with a first connecting part that extends along the Z-axis and connects the first limiting wall 71 and the second limiting wall 72. The first connecting part passes through the rotor 40 so that the rotor 40 is fixed relative to the body 70. The setting of the first connecting part not only improves the connection strength between the rotor 40 and the body 70, but also increases the connection strength between the first limiting wall 71 and the second limiting wall 72, thereby ensuring the reliability of the connection between the rotor 40 and the body 70.

[0075] In this embodiment, in practical application, the cup bottom 62 supports the rotor 40, and the cup wall 61 surrounds the outer periphery of the rotor 40. However, the outer periphery of the end of the rotor 40 near the cup bottom 62 cannot fit well with the cup bottom 62. Therefore, a gap is usually formed between the rotor 40 and the cup bottom 62. This gap is easy to misjudge when the rotor 40 is used in an electric water pump and is tested for air tightness. In addition, the gap will make the connection between the rotor 40 and the cup bottom 62 unreliable. In this embodiment, an annular space 623 is formed inside the protrusion 622. The body 70 is also provided with an annular body 74 and a second connecting part. The annular body 74 fills the annular space 623. The second connecting part connects the first limiting wall 71 and the annular body 74 and fits against the inner surface of the cup wall 61. Therefore, when the rotor 40 is housed in the cavity, the gap between the rotor 40 and the cup bottom 62, that is, the annular space 623, can be filled by the annular body 74, resulting in better airtightness. The second connecting part connects the annular body 74 and the first limiting wall 71, which further strengthens the strength of the body. In practical applications, the spacing between the adjacent magnets 42 of the second connecting part is such that the second connecting part can also limit the rotor 40 radially, thereby improving the connection strength between the rotor 40 and the body 70.

[0076] In this embodiment, the rotating sleeve 50 is combined with and fixed to the body 70 to seal the inner side of the rotor 40. Thus, both the inner and outer sides of the rotor 40 are sealed, making it less likely to be exposed to the coolant and resulting in a longer service life.

[0077] In this embodiment, the rotating sleeve 50 is made of metal and is injection molded into the body 70 and the sealing cup 60. This is a preferred embodiment, where the rotating sleeve 50 is made of metal, which provides high structural strength and a long service life. In other preferred embodiments, the rotating sleeve 50 is integrated with the body 70. In this case, the rotating sleeve is made of non-metallic material, which provides good lubrication and rust prevention, resulting in a long service life. Furthermore, the outer sealing structure 100 and the inner sealing structure of the rotor can be formed simultaneously, reducing the steps involved in installing the rotating sleeve 50 and making processing more convenient.

[0078] In this embodiment, a limiting block 51 protrudes from the outer wall of the rotating sleeve 50. The first limiting wall 71 and the second limiting wall 72 abut against each other along the Z-axis direction, which increases the connection strength between the body 70 and the rotating sleeve 50 and is more conducive to the relative fixation of the rotor 40 and the rotating sleeve 50 along the Z-axis direction.

[0079] In this embodiment, the extension groove 521 serves two purposes: firstly, it can be used to position the rotating sleeve 50 during the mold-opening process; secondly, when applied to an electric water pump, it allows the inner cavity of the rotating sleeve 50 to communicate with the rotor cavity 02 for rapid cooling, preventing dry friction between the rotating sleeve 50 and the pump shaft 20. Additionally, it can be used to position the rotating sleeve 50 relative to the iron core 41, facilitating magnetization of the iron core 41. The first limiting wall 71 and the second limiting wall 72 are also adapted to abut against the outer surface of the annular wall 52 in a direction perpendicular to the Z-axis, further increasing the connection strength between the body 70 and the rotating sleeve 50 and improving the sealing performance of the inner side of the rotor 40.

[0080] In this embodiment, the main body 70 is also provided with an impeller part 76. The impeller part 76 and the first limiting wall 71 are arranged along the Z-axis direction. When the impeller rotates, it can synchronously drive the rotor 40 to rotate, making the structure simpler and more practical.

[0081] In this embodiment, the rotor 40 includes an iron core 41 surrounding the rotating sleeve 50 and at least two magnets 42 fixed to the iron core 41 and located outside the iron core 41. The outer edge of the magnets 42 is close to the cup wall 61. A gap is formed between adjacent magnets 42 for the second connecting part to pass through. On the one hand, the second connecting part passes through the gap between adjacent magnets 42, which can limit the rotor 40 in the direction perpendicular to the Z-axis. On the other hand, compared with the scheme where the second connecting part is annular and located between the rotor 40 and the cup wall 61 of the sealing cup 60, it is also beneficial to reduce the plastic wall thickness between the rotor 40 and the stator 30, thereby reducing the magnetic gap between the rotor 40 and the stator 30 and improving the power density of the brushless motor.

[0082] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A rotor outer sealing structure (100) for sealing the outer side of a rotor (40), characterized in that, include: A sealing cup (60), formed by stamping and stretching of metal material and having an opening along the Z-axis, the sealing cup (60) comprising a cup wall (61) and a cup bottom (62) integrally connected to each other; and The body (70) is made of plastic material and is injection molded with the sealing cup (60) insert. The body (70) is provided with a first limiting wall (71) and a second limiting wall (72) along the Z-axis direction. The first limiting wall (71) abuts against the top of the cup wall (61) towards the bottom of the cup (62) along the Z-axis direction. The first limiting wall (71) also extends into the opening and abuts against the inner surface of the cup wall (61) perpendicular to the Z-axis direction. The second limiting wall (72) abuts against the bottom of the cup (62) towards the first limiting wall (71) along the Z-axis direction. The sealing cup (60) and the body (70) form a cavity suitable for accommodating the rotor (40).

2. The rotor outer sealing structure (100) as described in claim 1, characterized in that, The bottom of the cup (62) is provided with a bottom wall (621) and a protrusion (622). The protrusion (622) is arranged around the bottom wall (621) and connected to the cup wall (61). The protrusion (622) protrudes from the bottom wall (621) away from the first limiting wall (71) along the Z-axis direction. The second limiting wall (72) abuts against the bottom wall (621) along the Z-axis direction and abuts against the protrusion (622) in a direction perpendicular to the Z-axis direction.

3. The rotor outer sealing structure (100) as described in claim 2, characterized in that, The body (70) is also provided with a first connecting part that extends along the Z-axis and connects the first limiting wall (71) and the second limiting wall (72). The first connecting part passes through the rotor (40) so that the rotor (40) is fixed relative to the body (70).

4. The rotor outer sealing structure (100) as described in claim 2, characterized in that, The protrusion (622) forms an annular space (623) inside. The body (70) is also provided with an annular body (74) and a second connecting part. The annular body (74) fills the annular space (623). The second connecting part connects the first limiting wall (71) and the annular body (74) and fits the inner surface of the cup wall (61).

5. A rotor sealing structure, characterized in that, Includes a rotor outer sealing structure (100) and a rotating sleeve (50) as described in any one of claims 1 to 4, the rotating sleeve (50) engaging and securing to the body (70) to seal the inner side of the rotor (40).

6. The rotor sealing structure as described in claim 5, characterized in that, The rotating sleeve (50) is made of metal and is injection molded into the body (70) and the sealing cup (60).

7. A rotor sealing structure as described in claim 6, characterized in that, The outer wall of the rotating sleeve (50) protrudes and is provided with a limiting block (51) extending in the Z-axis direction. The first limiting wall (71) and the second limiting wall (72) also abut against the limiting block (51) relative to each other in the Z-axis direction.

8. A rotor sealing structure as described in claim 7, characterized in that, The rotating sleeve (50) has annular walls (52) protruding from the first limiting wall (71) and the second limiting wall (72) along the Z-axis direction at both ends. The first limiting wall (71) and the second limiting wall (72) are also adapted to abut against the outer surface of the annular wall (52) along the direction perpendicular to the Z-axis. Each annular wall (52) has at least one extension groove (521) that penetrates through and communicates with the inner cavity of the rotating sleeve (50) along the direction perpendicular to the Z-axis.

9. A rotor sealing structure as described in claim 5, characterized in that, The rotating sleeve (50) is integrated with the main body (70).

10. A rotating assembly of an electric water pump, characterized in that, The device includes a rotor (40) and a rotor sealing structure as described in any one of claims 5 to 9, wherein the rotor (40) is housed in the cavity and the rotating sleeve (50) is located inside the rotor (40).

11. The rotating assembly of an electric water pump as described in claim 10, characterized in that, The body (70) is also provided with an impeller (76), which is arranged along the Z-axis with the first limiting wall (71).

12. A rotating assembly of an electric water pump, characterized in that, The rotor (40) includes a rotor (40), a rotating sleeve (50), and a rotor outer sealing structure (100) as described in claim 4; the rotating sleeve (50) is engaged with and fixed to the body (70) to seal the inner side of the rotor (40), the rotor (40) includes an iron core (41) surrounding the rotating sleeve (50) and at least two magnets (42) fixed to the iron core (41) and located outside the iron core (41), the outer edge of the magnets (42) is close to the cup wall (61), and a gap is formed between adjacent magnets (42) for the second connecting portion to pass through.

13. An electric water pump, characterized in that, Includes a rotor assembly as described in any one of claims 10-12.

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