Electronic water pump and automobile

Abstract

The utility model discloses an electronic water pump. The electronic water pump comprises a shell; the inner shell is embedded in the outer shell, integrally connected with the outer shell and used for dividing the inner space of the outer shell into two independent cavities, and the outer wall of the inner shell and the inner wall of the outer shell are arranged in a spaced mode to form a rotor cavity; the rotor assembly comprises a rotor embedded in the rotor cavity and a limiting bearing located between the rotor and the outer wall of the inner shell, the limiting bearing is fixedly connected with the rotor, and the limiting bearing is rotationally connected with the inner shell; the stator is embedded in the inner shell and corresponds to the rotor; an annular groove is formed in the wall face, facing the inner shell, of the limiting bearing, an annular protrusion matched with the annular groove is arranged on the outer wall of the inner shell in the circumferential direction of the inner shell, and the annular protrusion is in sliding fit with the annular groove and used for axially limiting the rotor assembly. According to the rotor assembly, the annular groove and the annular protrusion are matched to replace traditional limiting parts such as a clamping ring and a baffle ring, and the situation of accidental falling is avoided while it is ensured that the rotor assembly is axially limited.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to an electronic water pump. In addition, the present application also relates to an automobile comprising the electronic water pump. Background Art

[0002] In the field of new energy vehicles, electronic water pumps have gradually replaced traditional mechanical water pumps, delivering coolant to the vehicle's thermal management system, taking away most of the heat generated by the vehicle's drive motor, battery and control module, and providing thermal fluid for the heater system, ensuring that the vehicle's electronic control system is in the optimal operating temperature range, thereby improving the reliability and safety of new energy vehicles.

[0003] In existing automotive electronic water pumps, a retaining ring or a shaft retaining ring is usually used as a limiter to axially limit the rotor assembly. However, this design has a great defect. After the water pump has been working for a period of time, there is a risk that the retaining ring and the retaining ring will fall off, affecting the normal operation of the water pump, and in severe cases, causing damage to the water pump.

[0004] Therefore, in view of the above technical problems, how to prevent the limiting member from falling off is a technical problem that technical personnel in this field need to solve. Utility Model Content

[0005] The purpose of the present application is to provide an electronic water pump, which utilizes the annular protrusion of the inner shell to cooperate with the annular groove of the limit bearing, which can not only axially limit the rotor assembly, but also effectively prevent the falling of limiting parts such as retaining rings and baffle rings.

[0006] To achieve the above object, the present application provides an electronic water pump, comprising a housing, and further comprising:

[0007] An inner shell, embedded in the outer shell and integrally connected with the outer shell, is used to divide the inner space of the outer shell into two independent cavities, and the outer wall of the inner shell is spaced apart from the inner wall of the outer shell to form a rotor cavity;

[0008] A rotor assembly, comprising a rotor embedded in the rotor cavity and a limit bearing located between the rotor and the outer wall of the inner shell, wherein the limit bearing is fixedly connected to the rotor and rotatably connected to the inner shell;

[0009] A stator, embedded in the inner shell and corresponding to the rotor;

[0010] Among them, an annular groove is opened on the wall surface of the limit bearing facing the inner shell, and an annular protrusion cooperating with the annular groove is arranged along the circumference of the outer wall of the inner shell, and the annular protrusion is slidably matched with the annular groove to limit the axial position of the rotor assembly.

[0011] Preferably, the limit bearing is sleeved on the outer periphery of the inner shell, and one end thereof extends into the rotor and is fixedly connected to the rotor, and the other end thereof extends axially along the outer wall of the inner shell, and a chamfer is provided on the circular ring at the end.

[0012] Preferably, during the mating process between the annular groove and the annular protrusion, the chamfer and the annular protrusion are press-fitted with interference to press the end of the limit bearing to expand outward, and reset after the annular groove and the annular protrusion are mated.

[0013] Preferably, a locking member fixed to the rotor is provided on the limit bearing extending into the rotor.

[0014] Preferably, the limit bearing and the inner shell are plastic parts, and the wear resistance of the limit bearing is lower than the wear resistance of the annular protrusion.

[0015] Preferably, an impeller for pumping coolant is fixedly disposed on the rotor, and a volute sealedly connected to the outer casing is disposed outside the impeller.

[0016] Preferably, a control board electrically connected to the stator is fixedly disposed in the housing, a female plug electrically connected to the control board is fixedly disposed on the outside of the housing, and the female plug cooperates with an external power plug to provide electrical energy to the control board.

[0017] Preferably, the electronic water pump further comprises a back cover located at the bottom of the housing and sealedly connected to the housing.

[0018] An automobile comprises the electronic water pump described in any one of the above items.

[0019] Compared with the above background technology, the present application divides the internal space of the outer shell into two independent cavities by setting an integrated inner shell structure in the outer shell. The rotor assembly and the stator are respectively set in the two cavities, which can effectively prevent the coolant from entering the stator cavity and protect the stator and the control board. At the same time, the rotor in the rotor cavity is axially limited by a limit bearing. Specifically, the limit bearing is located between the rotor and the outer wall of the inner shell, and the limit bearing is fixedly connected to the rotor. At the same time, an annular groove is provided on the wall surface of the limit bearing facing the inner shell, and an annular protrusion that cooperates with the annular groove is provided along the circumference of the outer wall of the inner shell, and the annular protrusion is slidably matched with the annular groove, which can effectively limit the axial position of the rotor assembly without affecting the normal rotation of the rotor. The present application utilizes the cooperation of the annular groove and the annular protrusion to replace traditional limiters such as retaining rings and retaining rings, and will not accidentally fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A cross-sectional view of an electronic water pump provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of the partially enlarged structure.

[0023] In the figure: 100, volute 200, impeller 300, outer shell 310, stator cavity 320, rotor cavity 400, inner shell 410, annular protrusion 500, stator 600, rotor assembly 610, limit bearing 611, annular groove 612, chamfer 620, rotor 700, female plug 800, control board 900, back cover. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are 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, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1 As shown, in this embodiment, an electronic water pump is provided, which includes an outer shell 300, an inner shell 400, a rotor assembly 600 and a stator 500. The outer shell 300 is a component in the prior art, and there is no need to make too many restrictions on it, as long as it plays a certain protective role.

[0028] The inner shell 400 is embedded in the outer shell 300 and is integrally formed with the outer shell 300. It can be integrally injection molded without adding additional steps, with good processability, higher efficiency and lower cost; please refer to Figure 1 The inner shell 400 divides the inner space of the outer shell 300 into two independent cavities, namely the rotor cavity 320 and the stator cavity 310. The outer wall of the inner shell 400 is spaced apart from the inner wall of the outer shell 300 to form the rotor cavity 320, and the rotor 620 is rotatably disposed in the rotor cavity 320. The inner shell 400 has a stator cavity 310 for accommodating the stator 500, and the stator 500 is fixed in the stator cavity 310.

[0029] It should be noted that the positions of the stator 500 and the rotor 620 need to correspond to ensure that the two can cooperate so that the rotor 620 can rotate normally. As for the specific fixing method of the stator 500, there is no excessive restriction here, and the fixing effect of the stator 500 is ensured.

[0030] Please refer to Figure 1 The rotor assembly 600 includes a rotor 620 embedded in the rotor cavity 320 and a limit bearing 610 located between the rotor 620 and the outer wall of the inner shell 400. Generally speaking, the rotor 620 is a cylindrical structure. Therefore, in order to adapt to the structure of the rotor 620, the limit bearing 610 and the inner shell 400 can be set as cylindrical structures, and the limit bearing 610 is set on the outer periphery of the inner shell 400.

[0031] Specifically, the limiting bearing 610 needs to be fixedly connected to the rotor 620 , and the limiting bearing 610 needs to be rotatably connected to the inner shell 400 , so as to ensure that the rotation performance of the rotor 620 is not affected.

[0032] It should be noted that the rotor 620 needs to be axially limited during the rotation process. In this embodiment, the annular groove 611 and the annular protrusion 410 are used to achieve the axial limitation. Figure 2 An annular groove 611 is provided on the wall surface of the limit bearing 610 facing the inner shell 400, and an annular protrusion 410 cooperating with the annular groove 611 is provided along the circumference of the outer wall of the inner shell 400, and the annular protrusion 410 is slidably matched with the annular groove 611, thereby limiting the axial position of the rotor assembly 600.

[0033] Of course, the annular protrusion 410 and the annular groove 611 need to have a certain gap, and the two do not need to fit perfectly, but only need to ensure axial limit to prevent the rotor assembly 600 from axial deviation. The gap between the annular protrusion 410 and the annular groove 611 can improve the relative sliding effect between the two and reduce the loss caused by sliding friction between the two.

[0034] In addition, due to the cooperation between the annular groove 611 and the annular protrusion 410 , a certain axial support effect can be provided to the rotor assembly 600 , and a positioning effect of the rotor 620 can be provided to a certain extent.

[0035] In summary of the above embodiments, the present application divides the internal space of the outer shell 300 into two independent cavities by setting an integrated inner shell 400 in the outer shell 300, and the rotor assembly 600 and the stator 500 are respectively set in the two cavities, which can effectively prevent the coolant from entering the stator cavity 310 and protect the stator 500 and the control board 800. At the same time, the rotor 620 in the rotor cavity 320 is axially limited by the limit bearing 610. Specifically, the lower part of the limit bearing 610 is located between the rotor 620 and the outer wall of the inner shell 400, and the upper part of the limit bearing 610 is fixedly connected to the rotor 620. Specifically, the upper part of the limit bearing 610 can be inserted into the top through hole of the rotor 620, and a limit protrusion can be set on the upper part of the limit bearing 610, so as to limit the axial position of the rotor 620, and at the same time, the radial movement of the rotor 620 can be limited by a fixed connection, so as to ensure the rotation stability of the rotor 620.

[0036] At the same time, an annular groove 611 is provided on the wall surface of the limiting bearing 610 facing the inner shell 400, and an annular protrusion 410 cooperating with the annular groove 611 is provided along the circumference of the outer wall of the inner shell 400, and the annular protrusion 410 is slidably matched with the annular groove 611, which can effectively limit the axial position of the rotor assembly 600 without affecting the normal rotation of the rotor 620. The present application utilizes the cooperation of the annular groove 611 and the annular protrusion 410 to replace traditional limiting parts such as clamping rings and retaining rings, and will not accidentally fall off.

[0037] As mentioned above, the limit bearing 610 is sleeved on the outer periphery of the inner shell 400 and rotates relative to the inner shell 400, and one end of the limit bearing 610 extends into the rotor 620 and is fixedly connected to the rotor 620. Please refer to Figure 1 The other end of the limit bearing 610 extends axially along the outer wall of the inner shell 400, thereby forming a portion sleeved on the outer periphery of the inner shell 400. A chamfer 612 is provided on the circular ring at the end of the limit bearing 610 sleeved on the outer periphery of the inner shell 400.

[0038] During the mating process of the limit bearing 610 and the inner shell 400, that is, the press-fitting process of the annular groove 611 and the annular protrusion 410, the chamfer 612 first contacts the annular protrusion 410, and due to the existence of the chamfer 612 structure, the chamfer 612 and the annular protrusion 410 are press-fitted with interference, thereby pressing the end of the limit bearing 610 to expand outward, which facilitates the mating of the limit bearing 610 and the inner shell 400, and after the annular groove 611 and the annular protrusion 410 are mated in place, the limit bearing 610 is reset.

[0039] At the same time, a locking member fixed to the rotor 620 is provided on the limit bearing 610 extending into the rotor 620. The locking member can be in various forms to ensure that the two are relatively fixed. It will not be described here in detail and reference can be made to the prior art.

[0040] In addition, the limit bearing 610 and the inner shell 400 of the present application are plastic parts. Of course, the outer shell 300, the volute 100, the rear cover 900, etc. can all be plastic parts, with a simple manufacturing process and convenient assembly. It should be noted that since there is friction loss between the limit bearing 610 and the annular protrusion 410, in order to facilitate the replacement of parts after a certain friction loss occurs, the wear resistance of the limit bearing 610 here needs to be lower than the wear resistance of the annular protrusion 410. When replacing, only the limit bearing 610 needs to be replaced, and the inner shell 400 does not need to be replaced as a whole, thereby reducing the cost of consumables.

[0041] At the same time, the high wear resistance of the annular protrusion 410 can prevent the inner shell 400 from being worn through, thereby preventing the coolant from entering the stator cavity 310 .

[0042] Similar to the prior art, an impeller 200 for pumping coolant is fixedly provided on the rotor 620, and a volute 100 sealedly connected to the outer casing 300 is provided outside the impeller 200. The functions of the impeller 200 and the volute 100 are not described here in detail, and reference may be made to the prior art.

[0043] Generally speaking, the control board 800 of the electronic water pump is located in the housing 300. Figure 1 In this embodiment, the control board 800 is disposed at the lower part of the housing 300 without affecting other components inside the housing 300. The control board 800 is electrically connected to the stator 500 and the female plug 700, thereby providing electrical energy to the stator 500.

[0044] Please refer to Figure 1 A female plug 700 electrically connected to the control board 800 is fixed on the outer side of the housing 300. The female plug 700 may be a part of the housing 300. The plug is integrally molded in the female plug 700 through a mold. The female plug 700 cooperates with an external power plug to provide power to the control board 800. As for the specific setting of the female plug 700 and the connection method between the female plug 700 and the control board 800, reference can be made to the prior art and will not be repeated here.

[0045] In addition, the electronic water pump also includes a back cover 900 located at the bottom of the shell 300 and sealed with the shell 300. The back cover 900 and the shell 300 can be ultrasonically welded, and the stator cavity 310 is completely sealed, and no water vapor will enter the stator cavity 310, thereby ensuring the sealing of one side of the stator cavity 310.

[0046] The present application also provides a car, which includes any of the above-mentioned electronic water pumps and other necessary components of the car, which will not be described here in detail and can be referred to the prior art.

[0047] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0048] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An electronic water pump, comprising a housing (300), characterized in that: Also includes: an inner shell (400) embedded in the outer shell (300) and integrally connected to the outer shell (300), and used to divide the internal space of the outer shell (300) into two independent cavities, wherein the outer wall of the inner shell (400) and the inner wall of the outer shell (300) are spaced apart to form a rotor cavity (320); A rotor assembly (600), comprising a rotor (620) embedded in the rotor cavity (320) and a limit bearing (610) located between the rotor (620) and an outer wall of the inner shell (400), wherein the limit bearing (610) is fixedly connected to the rotor (620) and the limit bearing (610) is rotatably connected to the inner shell (400); a stator (500), embedded in the inner shell (400) and corresponding to the rotor (620); In which, an annular groove (611) is provided on the wall surface of the limit bearing (610) facing the inner shell (400), and an annular protrusion (410) cooperating with the annular groove (611) is provided along the circumference of the outer wall of the inner shell (400), and the annular protrusion (410) and the annular groove (611) are slidably matched to limit the axial position of the rotor assembly (600).

2. The electronic water pump according to claim 1, characterized in that: The limit bearing (610) is sleeved on the outer circumference of the inner shell (400), and one end thereof extends into the rotor (620) and is fixedly connected to the rotor (620), and the other end thereof extends axially along the outer wall of the inner shell (400), and a chamfer (612) is provided on the circular ring at the end.

3. The electronic water pump according to claim 2, characterized in that: During the mating process between the annular groove (611) and the annular protrusion (410), the chamfer (612) and the annular protrusion (410) are press-fitted by interference fit to press the end of the limit bearing (610) to expand outward, and are reset after the annular groove (611) and the annular protrusion (410) are mated.

4. The electronic water pump according to claim 2, characterized in that: The limit bearing (610) extending into the rotor (620) is provided with a locking member fixed to the rotor (620).

5. The electronic water pump according to any one of claims 1 to 4, characterized in that: The limit bearing (610) and the inner shell (400) are plastic parts, and the wear resistance of the limit bearing (610) is lower than the wear resistance of the annular protrusion (410).

6. The electronic water pump according to claim 5, characterized in that: An impeller (200) for pumping cooling liquid is fixedly arranged on the rotor (620), and a volute (100) sealedly connected to the housing (300) is arranged outside the impeller (200).

7. The electronic water pump according to claim 5, characterized in that: A control board (800) electrically connected to the stator (500) is fixedly arranged in the housing (300), and a female plug (700) electrically connected to the control board (800) is fixedly arranged on the outside of the housing (300); the female plug (700) cooperates with an external power plug to provide electrical energy to the control board (800).

8. The electronic water pump according to claim 5, characterized in that: It also includes a back cover (900) located at the bottom of the housing (300) and sealedly connected to the housing (300).

9. A car, characterized in that: It comprises the electronic water pump as described in any one of claims 1 to 8.

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