CN215566836U

CN215566836U - Impeller mechanism of electronic water pump

Info

Publication number: CN215566836U
Application number: CN202120940405.9U
Authority: CN
Inventors: 罗力成; 朱林杰; 王雪皎; 叶飞飞
Original assignee: Ningbo Shenglong Intelligent Automobile System Co ltd
Current assignee: Ningbo Shenglong Intelligent Automobile System Co ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-01-18
Anticipated expiration: 2031-04-30

Abstract

The utility model discloses an impeller mechanism of an electronic water pump, which comprises an upper impeller cover and a lower impeller cover, wherein an upper bearing and a lower bearing are respectively arranged at two ends of the middle part of the lower impeller cover along the axial direction of the lower impeller cover; the upper end of the impeller lower cover is connected with the impeller upper cover. The impeller mechanism of the electronic water pump disclosed by the utility model is convenient to process, stable in structure and low in cost.

Description

Impeller mechanism of electronic water pump

Technical Field

The utility model relates to the technical field of electronic water pumps, in particular to an impeller mechanism of an electronic water pump.

Background

At present, the main function of an automobile water pump is to cool an engine, an air conditioner and the like, the circulation of the automobile water pump is mainly a water path, the automobile water pump is divided into a mechanical water pump and an electronic water pump, the mechanical water pump is driven by the engine, the cooling effect is in direct proportion to the rotating speed of the engine, the mechanical water pump cannot be closed when cooling is not needed, and a water inlet and a water outlet can only be closed by a thermostat, so that energy loss is caused. The electronic water pump can be controlled by the control unit, and whether the electronic water pump needs to work or not is judged according to the temperature change of the engine. When the new energy automobile is driven by the motor, the mechanical water pump depending on the engine cannot work, but the motor still needs the temperature control of the cooling system, so the new energy automobile must adopt the electronic water pump. In addition, the electronic water pump has the advantages of energy conservation, consumption reduction, high efficiency and environmental protection, and under the support and guidance of national policies, the electronic water pump gradually replaces the traditional mechanical water pump.

In the impeller assembly process schemes of the existing electronic water pumps, rotor magnetic steel is firstly pressed into a shaft, then is coated by a stainless steel sleeve, and then is subjected to laser welding, and a top impeller is also clamped on the shaft through press mounting; the other scheme is that the rotor magnetic steel is wrapped by a stainless steel sleeve outside and then integrally injected with the bearing, the structure has high requirements on bearing materials, the bearing has cracks due to different thermal expansion coefficients of the materials in the integral injection molding process, and the injection molding plastic cannot be in close contact with the stainless steel sleeve due to different thermal expansion coefficients, so that gaps are formed among parts, cooling liquid leakage is caused, and silicon steel sheets and magnetic steel are corroded.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the impeller mechanism of the electronic water pump overcomes at least one defect in the prior art, and is convenient to machine, stable in structure and low in cost.

The technical scheme adopted by the utility model is as follows: the impeller mechanism of the electronic water pump comprises an upper impeller cover and a lower impeller cover, wherein an upper bearing and a lower bearing are respectively arranged at two ends of the middle part of the lower impeller cover along the axial direction of the lower impeller cover, the upper bearing and the lower bearing are supported and limited through a bearing support, a rotor assembly is sleeved at one end, close to the lower bearing, of the outer part of the bearing support, a plastic coating layer is arranged on the outer part of the rotor assembly, and the lower impeller cover, the upper bearing, the lower bearing, the bearing support and the rotor assembly are connected into a whole in a plastic coating mode; the upper end of the impeller lower cover is connected with the impeller upper cover.

Compared with the prior art, the utility model has the following advantages:

in the structure of the utility model, the material of the outer part of the rotor component and the material of the secondary plastic coating of the lower cover of the impeller are both plastics, so that the gap generated after cold and hot alternation due to the inconsistent thermal expansion coefficients caused by different materials is avoided, and the risk of liquid permeation corrosion is greatly reduced; in addition, the rotor assembly in the structure is pre-processed into an assembly structure, and is directly processed in an integral plastic-coated connection mode when being connected with the lower cover of the impeller and the bearing, so that the processing is convenient, and the connection structure is stable; and the bearing in the structure is replaced by two short bearings and a bearing bracket positioning mechanism from a common long bearing, so that the cost is reduced, and the risk of bearing cracking after the whole plastic coating is avoided.

Furthermore, the rotor subassembly include the silicon steel sheet, the inside cartridge of silicon steel sheet has the magnet steel, plastics cladding layer plastic-coated shaping on the lateral wall and the both ends face of silicon steel sheet. In the structure, the plastic layer is formed on the outer part through the first plastic coating forming, so that the problem that the silicon steel sheet and the plastic cannot be tightly connected at one time due to different materials in the second plastic coating forming is solved; in addition, when once the package moulds in this structure, not the package moulds on the inner wall of silicon steel sheet, can reduce the degree of difficulty of moulding plastics on the one hand, in addition, can carry out radial limiting action through the hole of silicon steel sheet when moulding plastics for the first time.

As an improvement, two axial end faces of the rotor assembly are respectively provided with a first limiting groove and a positioning boss. In the improved structure, the first limiting groove structure is mainly arranged in the subsequent second plastic coating forming process, plastic can enter the first limiting groove, and a positioning convex column structure matched with the first limiting groove is formed in the first limiting groove after cooling, so that the plastic coating connecting structure of the rotor assembly and the lower shell of the impeller is more stable; in addition, the positioning boss is mainly used for facilitating positioning on the die when the plastic is coated for the second time, so that the qualification rate of finished products is guaranteed.

And the inner side wall of the rotor assembly is provided with a second limiting groove extending axially. In this improvement structure, set up corresponding spacing recess of second on the inside wall of rotor subassembly, like this when the secondary package is moulded, the sizing material of moulding plastics can get into the spacing groove of second, has formed the plastics arch that matches with the spacing recess of second promptly after the sizing material cooling to improve the secondary package and mould the stability of being connected of casing and rotor subassembly under the shaping rear impeller.

And the structure of the upper bearing is the same as that of the lower bearing, and positioning grooves extending along the circumferential direction of the upper bearing are arranged on the outer side walls of the upper bearing and the lower bearing. In the structure, the upper bearing and the lower bearing are consistent in structure, batch processing can be simultaneously carried out during processing, and the upper position and the lower position are not needed to be distinguished during assembly, so that the processing efficiency is improved; in addition, the positioning grooves are additionally arranged outside the upper bearing and the lower bearing, so that injection molding glue can enter the corresponding positioning grooves when plastic coating molding is carried out, and a plastic bulge structure matched with the positioning grooves is formed after the glue is cooled, so that the connection stability of the lower shell of the impeller and the upper bearing and the lower bearing after secondary plastic coating molding is improved.

Preferably, the impeller upper cover is a plastic part, and the impeller upper cover and the impeller lower cover are connected by ultrasonic welding. In the preferred structure, the upper cover of the impeller is also a plastic piece, so that the impeller is light in weight and convenient to process; and the connection of the upper impeller cover and the lower impeller cover in the later period is more convenient, and the ultrasonic welding can be directly carried out.

And the lower end surface of the upper impeller cover is provided with a positioning column matched with the positioning hole. In this structure, the cooperation of corresponding annular arch and locating hole makes impeller upper cover and impeller lower cover location stable to as long as carry out the ultrasonic bonding in the reference column position can, convenient operation.

Drawings

Fig. 1 is a schematic structural view of an impeller mechanism of an electric water pump of the present invention.

Fig. 2 is a schematic half-sectional structure view of an impeller mechanism of an electronic water pump of the present invention.

Fig. 3 is a schematic view of the structure of the rotor assembly in the present invention.

Fig. 4 is a radial cross-sectional view of a rotor assembly in the present invention.

Fig. 5 is a schematic structural view of an upper bearing or a lower bearing in the present invention.

Wherein shown in the figure:

1-impeller upper cover, 1.1-positioning column, 2-impeller lower cover, 2.1-positioning hole, 3-upper bearing, 4-lower bearing, 5-bearing support, 5.1-second positioning groove, 6-rotor component, 6.1-silicon steel sheet, 6.2-magnetic steel, 7-plastic coating layer, 8-first limiting groove, 9-positioning boss, 10-second limiting groove and 11-first positioning groove.

Detailed Description

The utility model is further described with reference to the following figures and detailed description.

In the description of the present invention, it should be noted that the terms "middle portion", "upper and lower portions", "outer portion", "inner side wall", "outer side wall", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It should also be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying any limitation on relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, the present invention provides an impeller mechanism of an electronic water pump, which includes an upper impeller cover 1 and a lower impeller cover 2, wherein an upper bearing 3 and a lower bearing 4 are respectively disposed at two ends of the lower impeller cover 2 along the axial direction thereof, and a bearing support 5 is used between the upper bearing 3 and the lower bearing 4 for supporting and limiting.

A rotor assembly 6 is sleeved at one end, close to the lower bearing 4, of the outer part of the bearing support 5, a plastic coating layer 7 is arranged on the outer part of the rotor assembly 6, and the impeller lower cover 2 is in plastic-coated connection with the upper bearing 3, the lower bearing 4, the bearing support 5 and the rotor assembly 6; before secondary plastic coating, one end parts of an upper bearing 3 and a lower bearing 4 are matched in a corresponding second positioning groove 5.1 on a bearing support 5 in advance, the whole bearing assembly is positioned in a mold after the positioning, a rotor assembly 6 is sleeved outside the bearing assembly after the positioning, the two parts of structures are positioned in the secondary plastic coating forming mold together, and after the positioning of all parts is finished, the parts are fixedly connected together through a plastic process.

And the upper end of the impeller lower cover 2 is connected with the impeller upper cover 1. In the embodiment, the plastic coating connecting material for the second time is the same as the plastic coating layer 7 outside the rotor assembly 6, so that gaps generated after cold and hot alternation due to inconsistent thermal expansion coefficients caused by different materials are avoided, and the risk of liquid permeation corrosion is greatly reduced.

In this embodiment, preferably, the impeller upper cover 1 is also a plastic part, and the impeller upper cover 1 and the impeller lower cover 2 are connected by ultrasonic welding, so that the structure is simple and the connection is convenient. Meanwhile, in order to ensure that the welding position of the upper impeller cover 1 and the lower impeller cover 2 is more accurate, in the structure, the upper end surface of the lower impeller cover 2 is provided with an annular positioning hole 2.1, correspondingly, the lower end surface of the upper impeller cover 1 is provided with a positioning column 1.1 matched with the positioning hole 2.1, and the upper impeller cover and the lower impeller cover are welded at the position matched with the positioning hole, as shown in fig. 2.

As shown in fig. 2 and 4, in this embodiment, the rotor assembly 6 includes a silicon steel sheet 6.1, magnetic steel 6.2 is inserted into the silicon steel sheet 6.1, and a plastic coating layer 7 is formed on an outer side wall and two end faces of the silicon steel sheet 6.1 in a plastic-coated manner. And after plastic-coated molding, two axial end faces of the rotor assembly 6 are respectively provided with a first limiting groove 8 and a positioning boss 9, as shown in fig. 3. The location boss 9 in this structure mainly is when the connection is moulded to the package for the second time for fix a position rotor subassembly 6 on the mould, in addition, set up behind first spacing recess 8 structures on rotor subassembly 6 both ends face, when the shaping is moulded to the secondary package, the package is moulded the sizing material and can be entered into corresponding first spacing recess 8, treat that the package moulds the spacing protruding structure that the sizing material cooling back just formed and matches with first spacing recess 8, improve the secondary package and mould the stability of connecting back overall structure. More specifically, in this structure, the first limiting groove 8 is also divided into two types of structures, including four through holes 8.1 for radial limiting and four counter bores 8.2 for axial limiting, and the four through holes 8.1 and the four counter bores 8.2 are respectively distributed along the circumferential direction in a staggered manner.

Similarly, in order to improve the overall structural stability of the impeller lower cover 2 after the secondary plastic coating, a second limiting groove 10 extending axially is formed in the inner side wall of the rotor assembly 6. Specifically, this spacing recess 10 of second sets up on silicon steel sheet 6.1's inside wall, because when rotor subassembly 6 is moulded for the first time, does not wrap on silicon steel sheet 6.1 inside wall and moulds, has reduced the degree of difficulty that the package was moulded promptly, can make silicon steel sheet 6.1 fix a position on the mould through the hole when first package was moulded again. When the secondary package is moulded, the second spacing recess 10 on the silicon steel sheet 6.1 inside wall just played an effect like this, because the process of moulding is moulded at the secondary package will be filled between silicon steel sheet 6.1 inner hole wall and bearing support 5 lateral wall and is moulded the sizing material, so at the package in-process of moulding, the package is moulded the sizing material and can be got into corresponding second spacing recess 10, treats to mould the sizing material cooling back and just formed the spacing protruding structure that matches with second spacing recess 10. In this structure, preferably, two second limiting grooves 10 are axisymmetrically arranged on the inner side wall of the silicon steel sheet 6.1. Of course, the number of the second limiting grooves 10 can also be three, four or even more in order to sufficiently ensure the positioning stability.

In this embodiment, the upper bearing 3 and the lower bearing 4 have the same structure, and the outer side walls of the upper bearing 3 and the lower bearing 4 are provided with positioning grooves 11 extending along the circumferential direction thereof, as shown in fig. 5. The structure of the positioning groove 11 is also designed to improve the structural stability of the impeller lower cover 2 after secondary plastic-coating molding, and the principle of the positioning groove is the same as that of the plastic-coating connection position of the first limiting groove 8 and the second limiting groove 10, which is not described herein again.

The foregoing has described preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary, and various changes made within the scope of the independent claims of the present invention are within the scope of the present invention.

Claims

1. An electronic water pump impeller mechanism, its characterized in that: the impeller structure comprises an upper impeller cover (1) and a lower impeller cover (2), wherein an upper bearing (3) and a lower bearing (4) are respectively arranged at the middle part of the lower impeller cover (2) along the two axial ends of the lower impeller cover, the upper bearing (3) and the lower bearing (4) are supported and limited through a bearing support (5), a rotor assembly (6) is sleeved at one end, close to the lower bearing (4), of the outer part of the bearing support (5), a plastic coating layer (7) is arranged on the outer part of the rotor assembly (6), and the lower impeller cover (2), the upper bearing (3), the lower bearing (4), the bearing support (5) and the rotor assembly (6) are connected into a whole in a plastic coating manner; the upper end of the impeller lower cover (2) is connected with the impeller upper cover (1).

2. The electronic pump impeller mechanism of claim 1, wherein: rotor subassembly (6) include silicon steel sheet (6.1), the inside cartridge of silicon steel sheet (6.1) has magnet steel (6.2), plastic coating (7) plastic-coated shaping be in on lateral wall and the both ends face of silicon steel sheet (6.1).

3. The electric water pump impeller mechanism according to claim 1 or 2, wherein: and two axial end faces of the rotor assembly (6) are respectively provided with a first limiting groove (8) and a positioning boss (9).

4. The electric water pump impeller mechanism according to claim 1 or 2, wherein: and a second limit groove (10) which extends axially is arranged on the inner side wall of the rotor assembly (6).

5. The electronic pump impeller mechanism of claim 4, wherein: the upper bearing (3) and the lower bearing (4) are identical in structure, and the outer side walls of the upper bearing (3) and the lower bearing (4) are provided with (11) extending along the circumferential direction of the upper bearing.

6. The electronic pump impeller mechanism of claim 5, wherein: the impeller upper cover (1) is a plastic part, and the impeller upper cover (1) is connected with the impeller lower cover (2) through ultrasonic welding.

7. The electronic pump impeller mechanism of claim 5, wherein: the upper end face of the impeller lower cover (2) is provided with a plurality of positioning holes (2.1) which are uniformly arranged along the circumferential direction, and the lower end face of the impeller upper cover (1) is provided with positioning columns (1.1) matched with the positioning holes (2.1).

8. The electronic pump impeller mechanism of claim 1, wherein: the bearing support (5) is a hollow supporting tube, and second positioning grooves (5.1) used for containing the upper bearing (3) or the lower bearing (4) are formed in the two ends of the supporting tube.