Impeller and electric water pump

Abstract

The utility model provides an impeller and an electric water pump, and relates to the field of impeller structures. The impeller comprises a bearing, a rotor assembly and a cover body; the bearing and the rotor assembly form a main body piece in a one-time injection molding manner; the main body piece only forms plastic coating parts at two end surfaces in the axis direction of the rotor assembly, and the cover body is correspondingly connected with the main body piece. The bearing and the rotor assembly form the main body piece in a one-time injection molding mode, then the cover body is correspondingly connected with the main body piece, and compared with an impeller in the prior art, the impeller assembly mode is simple, and the machining efficiency is effectively improved; in addition, the main body piece only forms the plastic coating parts at the two end faces of the rotor assembly in the axial direction, the radial space of the rotor assembly is not occupied, and transmission of motor torque is facilitated.

Description

Technical Field

[0001] The present application relates to the field of impeller structures, and in particular to an impeller and an electric water pump. Background Art

[0002] In the existing impeller, such as Figure 1 As shown, the entire outer surface of the rotor must first be molded using overmolding. The rotor, overmolding, and bearings are then remolded into the impeller body. The overmolding typically has a wall thickness of 0.4mm to 0.6mm, which occupies radial space within the rotor, increasing the gap between the stator and rotor, hindering torque transmission. Furthermore, the existing two-shot impeller assembly method is complex and inefficient. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide an impeller to solve the problems that the existing impeller occupies the radial space of the rotor and has a complex assembly method and low processing efficiency.

[0004] According to the above purpose, the present invention provides an impeller, wherein the impeller includes a bearing, a rotor assembly and a cover body; the bearing and the rotor assembly are formed into a main body by one-time injection molding; the main body only forms a plastic-coated portion at both ends of the axial direction of the rotor assembly, and the cover body is correspondingly connected to the main body.

[0005] Preferably, the rotor assembly is sleeved on the outer side of the bearing and assembled with the bearing by press-fitting, so that the rotor assembly and the bearing form an interference fit; the axis of the rotor assembly is collinear with the axis of the bearing.

[0006] Preferably, the interference fit of the bearing is 0.05 mm to 0.15 mm.

[0007] Preferably, the rotor assembly is located at the first end of the bearing in the axial direction; along the axial direction of the bearing, the overmolding portion can cover the rotor assembly and the end surface of the first end of the bearing.

[0008] Preferably, the bearing is formed as a sintered powder metallurgy sliding bearing.

[0009] Preferably, a plurality of guide grooves are formed around the outer side wall of the bearing, and the plurality of guide grooves are evenly distributed at intervals; each of the guide grooves extends along the axial direction of the bearing.

[0010] Preferably, in the axial cross section of the bearing, the guide groove is formed into an arc-shaped structure.

[0011] Preferably, in the axial cross section of the bearing, the radius of the circular ring where the arc-shaped structure is located is 1.75 mm to 1.25 mm.

[0012] Preferably, the cover is welded to the main body.

[0013] According to a second aspect of the present invention, an electric water pump is provided, wherein the electric water pump includes the impeller described above.

[0014] According to the impeller and electric water pump of the present invention, the bearing and the rotor assembly are formed into a main body by one-time injection molding, and then the cover body is correspondingly connected to the main body. Compared with the impeller in the prior art, the impeller assembly method in the present invention is simple and effectively improves the processing efficiency; in addition, the main body only forms a plastic-coated portion at the two end faces in the axial direction of the rotor assembly, which does not occupy the radial space of the rotor assembly, which is beneficial to the transmission of the motor torque.

[0015] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a cross-sectional view of an impeller in the prior art;

[0018] Figure 2 is a cross-sectional view of an impeller according to an embodiment of the present utility model;

[0019] Figure 3 is a cross-sectional view of a main body according to an embodiment of the present utility model;

[0020] Figure 4 1 is an axial cross-section of a bearing according to an embodiment of the present invention.

[0021] Icon: 1-cover; 2-main body; 20-rotor assembly; 21-bearing; 210-guide groove; 22-plastic coating part. DETAILED DESCRIPTION

[0022] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0023] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0024] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0025] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0026] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0027] For ease of description, spatial relational 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 accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0028] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0029] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0030] The features of the examples described herein can 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.

[0031] According to the utility model, an impeller is provided, such as Figures 2 to 4 As shown, the impeller in this embodiment includes a bearing 21, a rotor assembly 20, and a cover 1. The bearing 21 and the rotor assembly 20 are formed into the main body 2 of the impeller by a single injection molding process, and the cover 1 is then connected to the main body 2. The specific structure of each of the above-mentioned parts of the impeller according to the present invention will be described in detail below.

[0032] In this embodiment, if Figures 2 to 3As shown, the rotor assembly 20 is sleeved on the outer side of the bearing 21, and the two are formed into an aggregate by press-fitting, and the rotor assembly 20 and the bearing 21 form an interference fit. After the two are assembled, the axes of the rotor assembly 20 and the bearing 21 are collinear to ensure the stability of the structure of the main body 2 described below; preferably, the rotor assembly 20 is sleeved on the first end of the axial direction of the bearing 21, and the interference of the bearing 21 is 0.05mm~0.15mm, which can improve the stability of the connection between the rotor assembly 20 and the bearing 21.

[0033] Furthermore, after the rotor assembly 20 and the bearing 21 are pressed together to form an assembly, the assembly is formed into the main body 2 of the impeller by using plastic-coating material and injection molding. The main body 2 only forms plastic-coating portions 22 at both ends of the axial direction of the rotor assembly 20 (the plastic-coating portion 22 can simultaneously cover the rotor assembly 20 and the end face of the first end of the bearing 21). In this way, while ensuring the stability of the overall structure of the main body 2, it can avoid occupying the radial space of the rotor assembly 20, which is beneficial to the transmission of the motor torque.

[0034] In addition, the bearing 21 in this embodiment is formed as a sintered powder metallurgy sliding bearing 21. Compared with the existing bearing 21 made of engineering materials or graphite materials, the bearing 21 in this embodiment has less friction noise and a longer service life. Figure 4 As shown, the outer wall of the bearing 21 is surrounded by a plurality of guide grooves 210, and the plurality of guide grooves 210 are evenly spaced, and each guide groove 210 extends along the axial direction of the bearing 21. More specifically, the guide groove 210 is formed as an arc-shaped groove, that is, in the axial cross-section of the bearing 21, the guide groove 210 is formed into an arc-shaped structure, and preferably, the radius of the circular ring where the arc-shaped structure is located is 1.75mm to 1.25mm. In this way, during injection molding, the molten plastic can flow smoothly through the guide groove 210 to the position where the plastic needs to be coated; and when the injection molding is completed, the guide groove 210 will be filled with injection molding material, which is beneficial to increase the structural strength of the main body 2.

[0035] It should be noted that the bearing 21, rotor assembly 20 and other components are conventional components in this field, so their structures are not described in detail. In addition, the structure and number of the guide grooves 210 are not fixed. For example, the bearing 21 can be surrounded by six square grooves.

[0036] Furthermore, the cover 1 is fixed to the second end of the main body 2 by ultrasonic welding.

[0037] According to the impeller of the present invention, the bearing 21 and the rotor assembly 20 are formed into a main body 2 by a one-time injection molding method, and then the cover body 1 is correspondingly connected to the main body 2. Compared with the impeller in the prior art, the impeller assembly method in the present invention is simple and effectively improves the processing efficiency; in addition, the main body 2 only forms a plastic-coated portion 22 at the two end faces in the axial direction of the rotor assembly 20, which does not occupy the radial space of the rotor assembly 20, which is beneficial to the transmission of the motor torque.

[0038] According to a second aspect of the present invention, an electric water pump is provided, wherein the electric water pump includes the impeller described above.

[0039] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. An impeller, characterized in that: The impeller includes a bearing, a rotor assembly and a cover body; the bearing and the rotor assembly are formed into a main body by one-time injection molding; the main body only forms a plastic-coated portion at both ends of the axial direction of the rotor assembly, and the cover body is correspondingly connected to the main body.

2. The impeller according to claim 1, characterized in that The rotor assembly is sleeved on the outer side of the bearing and assembled with the bearing by press-fitting, so that the rotor assembly and the bearing form an interference fit; the axis of the rotor assembly is collinear with the axis of the bearing.

3. The impeller according to claim 2, characterized in that The interference fit of the bearing is 0.05 mm to 0.15 mm.

4. The impeller according to claim 2, characterized in that The rotor assembly is located at the first end of the bearing in the axial direction; along the axial direction of the bearing, the plastic-coated portion can cover the rotor assembly and the end surface of the first end of the bearing.

5. The impeller according to claim 1, characterized in that The bearing is formed as a sintered powder metallurgy sliding bearing.

6. The impeller according to claim 5, characterized in that A plurality of guide grooves are formed around the outer side wall of the bearing, and the plurality of guide grooves are evenly distributed at intervals; each of the guide grooves extends along the axial direction of the bearing.

7. The impeller according to claim 6, characterized in that In the axial cross section of the bearing, the guide groove is formed into an arc-shaped structure.

8. The impeller according to claim 7, characterized in that In the axial cross section of the bearing, the radius of the circular ring where the arc-shaped structure is located is 1.75 mm to 1.25 mm.

9. The impeller according to claim 1, characterized in that The cover is welded to the main body.

10. An electric water pump, characterized in that: The electric water pump includes the impeller according to any one of claims 1 to 9.

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