阅读说明：本技术 电子水泵的叶轮转子组件及其成型工艺和电子水泵 (Impeller rotor assembly of electronic water pump, forming process of impeller rotor assembly and electronic water pump ) 是由 陈华江 葛笑 王东 于 2018-08-31 设计创作，主要内容包括：本发明提供了一种电子水泵的叶轮转子组件及其成型工艺和电子水泵。其中,叶轮转子组件主要通过先后两次注塑成型：将未充磁的磁钢安装在铁芯的磁钢槽内,然后将铁芯和磁钢作为芯模一放置在注塑模一内注塑出叶轮主体,叶轮主体、铁芯和磁钢成为叶轮转子组件一；将叶轮转子组件一作为芯模二放置在注塑模二内注塑出轴套,轴套和叶轮转子组件一成为叶轮转子组件二。上述方案,叶轮主体和轴套各自注塑成型,因此叶轮主体可采用较低成本的注塑料,节省制造成本；轴套体积小,重量轻,叶轮转子组件旋转时轴套不易打滑；轴套体积小,注塑轴套时速度快,不会对叶轮转子组件一造成影响,避免熔融叶轮主体造成铁芯和磁钢移位的风险。(The invention provides an impeller rotor assembly of an electronic water pump, a molding process of the impeller rotor assembly and the electronic water pump. Wherein, impeller rotor subassembly is mainly through injection moulding twice successively: installing non-magnetized magnetic steel in a magnetic steel groove of an iron core, then placing the iron core and the magnetic steel as a core die I in an injection die I to inject an impeller main body, wherein the impeller main body, the iron core and the magnetic steel form an impeller rotor assembly I; and placing the first impeller rotor assembly as a core mold II in the second injection mold to form a shaft sleeve, wherein the shaft sleeve and the first impeller rotor assembly become a second impeller rotor assembly. According to the scheme, the impeller main body and the shaft sleeve are respectively formed in an injection molding mode, so that the impeller main body can be made of injection molding materials with lower cost, and the manufacturing cost is saved; the shaft sleeve has small volume and light weight, and is not easy to slip when the impeller rotor assembly rotates; the axle sleeve is small, and is fast when moulding plastics the axle sleeve, can not cause the influence to impeller rotor subassembly one, avoids melting impeller main part to cause the risk that iron core and magnet steel shifted.)

1. A molding process of an impeller rotor assembly of an electronic water pump is characterized by comprising the following steps:

s102, installing non-magnetized magnetic steel in a magnetic steel groove of an iron core, then placing the iron core and the magnetic steel as a core mold I in an injection mold I to inject an impeller main body, wherein the impeller main body, the iron core and the magnetic steel form an impeller rotor assembly I;

s104, placing the impeller rotor assembly I as a core mold II in an injection mold II to be injected with a shaft sleeve, wherein the shaft sleeve and the impeller rotor assembly I become an impeller rotor assembly II.

2. The molding process of an impeller rotor assembly of an electric water pump according to claim 1,

the material for injection molding the impeller body in S102 is different from the material for injection molding the shaft sleeve in S104, and the material cost for injection molding the impeller body in S102 is lower than the material cost for injection molding the shaft sleeve in S104.

3. The molding process of an impeller rotor assembly of an electric water pump according to claim 1,

the inner circle of the iron core is grooved, and the groove of the inner circle of the iron core is filled with the injection molding material for injection molding of the shaft sleeve in S104.

4. The process of molding an impeller rotor assembly of an electric water pump according to any one of claims 1 to 3, further comprising, after S104:

s106, the impeller rotor assembly II and the blades are welded into a whole through ultrasonic waves to form an impeller rotor assembly III;

and S108, magnetizing the impeller rotor assembly III to obtain the impeller rotor assembly.

5. The process of molding an impeller rotor assembly of an electronic water pump according to claim 4, further comprising, before S106:

and S105, injection molding the blades by using the material for injection molding the impeller main body in the S102.

6. An impeller rotor assembly of an electronic water pump, which is manufactured by the molding process of the impeller rotor assembly of the electronic water pump according to any one of claims 1 to 5, and comprises:

impeller and rotor, the impeller includes impeller main part and blade, the rotor includes iron core, magnet steel and axle sleeve, be equipped with the magnet steel groove on the iron core, the magnet steel is installed in the magnet steel groove, the iron core with the magnet steel plastic envelope is in the inside impeller rotor subassembly that becomes of impeller main part is one, the axle sleeve secondary mould plastics in impeller rotor subassembly becomes impeller rotor subassembly two in one.

7. The impeller rotor assembly of the electric water pump according to claim 6,

a through groove is formed in the inner wall of the shaft sleeve.

8. An electronic water pump, characterized in that, including pump case, controller, stator module, casing, pivot and the impeller rotor subassembly of claim 6 or 7, the casing is installed between the pump case and the controller, the impeller rotor subassembly inserts in the pivot, the axle sleeve of the impeller rotor subassembly forms clearance fit with the pivot.

9. The electronic water pump of claim 8,

the shell is a shell injection molding body, the rotating shaft is embedded into the shell injection molding body, and the rotating shaft and the shell injection molding body form a shell rotating shaft component; or

The whole injection molding of stator module forms, the casing is the casing injection molding body, the stator module plastic envelope is in inside the casing injection molding body, the pivot embedding inside the casing injection molding body, stator module the pivot with the casing injection molding body becomes the casing subassembly.

10. The electronic water pump of claim 8,

the pump shell is fixedly connected with the front end of the machine shell through a screw, and a first sealing ring is arranged between the pump shell and the machine shell;

the controller is fixedly connected with the rear end of the machine shell through a screw, and a second sealing ring is arranged between the controller and the machine shell.

Technical Field

The invention relates to the technical field of electronic water pumps, in particular to a molding process of an impeller rotor assembly of an electronic water pump, the impeller rotor assembly of the electronic water pump manufactured by the molding process and the electronic water pump comprising the impeller rotor assembly.

Background

At present, the automobile electronic water pump impeller is made of aluminum and is formed by casting, fan blades and cover plates of the impeller are connected into blades through riveting, the structure is high in cost and heavy in weight, and the dynamic unbalance of the impeller is large due to the riveting forming.

Chinese patent document CN104061169A discloses an impeller rotor structure, which adopts two-step injection molding, wherein the first step is to inject the rotor core and the magnetic steel, and the second step is to inject the first step injection molding body as the core mold to form the impeller, so as to form the impeller rotor assembly as a whole, and the following disadvantages exist: 1) the rotor shaft hole is used as a sliding bearing to rub with the rotating shaft, wear-resistant materials are required to be used, the impeller and the rotor shaft hole are integrated, and the impeller uses reinforced PPS (CF 10%), so that the cost of the impeller is increased; 2) because different materials are adopted in the two-time injection molding, the inner wall of the rotor assembly is not firmly bonded with the impeller, the weight of the impeller is heavy, and the rotor and the impeller can be loosened due to the fact that the rotor drives the impeller to rotate and needs large torque; 3) the first injection molding adopts reinforced PPS (GF 30%), the second injection molding adopts PPS (CF 10%), the PPS and the thermoplastic materials are adopted, the injection molding melting temperature is 300-330 ℃, the volume of the second injection molding impeller is large, the injection molding time is long, an injection molding body formed after the first injection molding is easily melted, and an iron core and magnetic steel have the risk of displacement.

Disclosure of Invention

The present invention is directed to solving at least one of the above problems.

Therefore, the object of the first aspect of the present invention is to provide a molding process of an impeller rotor assembly of an electric water pump.

The second aspect of the present invention is to provide an impeller rotor assembly of an electronic water pump manufactured by the above molding process.

The third aspect of the invention aims to provide the electronic water pump comprising the impeller rotor assembly.

In order to achieve the above object, a technical solution of a first aspect of the present invention provides a molding process of an impeller rotor assembly of an electronic water pump, including: s102, installing non-magnetized magnetic steel in a magnetic steel groove of an iron core, then placing the iron core and the magnetic steel as a core mold I in an injection mold I to inject an impeller main body, wherein the impeller main body, the iron core and the magnetic steel form an impeller rotor assembly I; s104, placing the impeller rotor assembly I as a core mold II in an injection mold II to be injected with a shaft sleeve, wherein the shaft sleeve and the impeller rotor assembly I become an impeller rotor assembly II.

The forming process of the impeller rotor assembly of the electronic water pump provided by the scheme comprises the steps of forming the rotor by an iron core, magnetic steel and a shaft sleeve, forming the rotor and the impeller main body by a two-step injection molding process, forming the impeller main body by injection molding in the first step, and forming the shaft sleeve by injection molding in the second step, so that the injection molding materials used when the impeller main body and the shaft sleeve are respectively formed by injection molding can be different, the material requirement of the injection molding impeller main body is high strength and acid and alkali resistance, the material requirement of the injection molding shaft sleeve is wear resistance, high strength and acid and alkali resistance, the material cost used by the injection molding shaft sleeve is high, the material cost used by the injection molding impeller main body is low, compared with the impeller rotor assembly formed by integrally injection molding of the shaft sleeve and the impeller main body in the related technology, the manufacturing cost is saved, if one-step, the cost is high.

Secondly, the iron core and the magnetic steel are plastically packaged in the impeller main body, and the iron core and the magnetic steel are firmly bonded with the impeller main body; the shaft sleeve is small in size and light in weight, when the impeller rotor assembly rotates, the torque for driving the shaft sleeve to rotate is small, and the shaft sleeve is not easy to slip, so that the risk of slipping of the rotor assembly and the impeller in the circumferential direction in the related technology is well solved by the scheme; and the impeller main body is large in volume, the shaft sleeve is small in volume, the speed is high during the injection molding of the shaft sleeve, the influence on the impeller rotor assembly is avoided, the impeller main body which is subjected to the first injection molding cannot be melted during the secondary injection molding of the shaft sleeve, and therefore the injection molding body which is formed after the first injection molding is melted during the second injection molding of the impeller in the related art is well avoided, and the risk of displacement of the iron core and the magnetic steel is caused.

In addition, the forming process of the impeller rotor assembly of the electronic water pump provided by the technical scheme of the invention can also have the following additional technical characteristics:

in the above technical solution, preferably, the material for injection molding the impeller main body in S102 is different from the material for injection molding the shaft sleeve in S104, and the material cost for injection molding the impeller main body in S102 is lower than the material cost for injection molding the shaft sleeve in S104.

The used material of moulding plastics is different when impeller main part and the axle sleeve are injection moulding separately, the used material cost of the axle sleeve of moulding plastics is high, the used material cost of the impeller main part of moulding plastics is low, compare in the integrative impeller rotor subassembly of moulding plastics of axle sleeve and impeller main part, manufacturing cost has been saved to this scheme, because if adopt injection moulding once, the used material of axle sleeve is wear-resisting, high strength, acid and alkali-resistant material, this kind of material is also used to the impeller main part, the cost is higher.

In the above technical solution, preferably, the inner circle of the core is grooved, and the groove of the inner circle of the core is filled with an injection molding material for injection molding the shaft sleeve in S104.

Circle fluting in the iron core, during the axle sleeve of moulding plastics, the inslot of circle in the iron core is filled to the injection molding material, makes axle sleeve and iron core circumferencial direction can not skid to the risk of skidding of rotor assembly and impeller circumferencial direction among the correlation technique has been avoided well.

In the above technical solution, after S104, it is preferable to further include: s106, the impeller rotor assembly II and the blades are welded into a whole through ultrasonic waves to form an impeller rotor assembly III; and S108, magnetizing the impeller rotor assembly III to obtain the impeller rotor assembly.

The impeller comprises an impeller main body and blades, the impeller is formed through an ultrasonic welding process, and the blades and an impeller rotor assembly II are subjected to ultrasonic welding to form an impeller rotor assembly III; the injection mold for integral injection molding of the impeller is complex in structure and high in maintenance cost, the impeller is divided into two parts, namely an impeller main body and a blade, which are respectively subjected to injection molding, a welding line is designed on one of the blade and an impeller rotor assembly, a welding groove is designed on the other of the blade and the impeller rotor assembly, for example, the welding line is designed on the blade, the welding groove is designed on the impeller rotor assembly, and then ultrasonic welding is used for molding.

In the foregoing technical solution, preferably, before S106, the method further includes: and S105, injection molding the blades by using the material for injection molding the impeller main body in the S102.

The blades are formed by injection molding of the material of the impeller main body, so that the blades are convenient to form, and the blades and the impeller main body are convenient to perform ultrasonic welding operation.

The technical solution of the second aspect of the present invention provides an impeller rotor assembly of an electronic water pump, which is manufactured by using a molding process of the impeller rotor assembly of the electronic water pump according to any one of the above technical solutions, and includes: impeller and rotor, the impeller includes impeller main part and blade, the rotor includes iron core, magnet steel and axle sleeve, be equipped with the magnet steel groove on the iron core, the magnet steel is installed in the magnet steel groove, the iron core with the magnet steel plastic envelope is in the inside impeller rotor subassembly that becomes of impeller main part is one, the axle sleeve secondary mould plastics in impeller rotor subassembly becomes impeller rotor subassembly two in one.

The impeller rotor assembly of the electronic water pump comprises an impeller and a rotor, wherein the impeller comprises an impeller main body and blades; the rotor comprises an iron core, magnetic steel and a shaft sleeve, the rotor and the impeller main body are formed through a two-step injection molding process, the impeller main body is formed through injection molding in the first step, and the shaft sleeve is formed through injection molding in the second step, so that the impeller main body and the shaft sleeve are respectively formed through injection molding, the impeller main body can be made of injection molding materials with lower cost, and the manufacturing cost is saved; the iron core and the magnetic steel are sealed in the impeller main body in a plastic mode, bonding is firm, the size of the shaft sleeve is small, weight is light, and the shaft sleeve is not prone to slipping when the impeller rotor assembly rotates; the axle sleeve is small, and is fast when moulding plastics the axle sleeve, can not cause the influence to impeller rotor subassembly one to avoid melting impeller main part to cause the risk that iron core and magnet steel shifted.

In the above technical solution, preferably, a through groove is formed on an inner wall of the shaft sleeve.

A through groove is formed in the inner wall of the shaft sleeve, an air gap is formed between a stator assembly and an impeller rotor assembly of the electronic water pump, the stator assembly and the impeller rotor assembly form a water path, and self-cooling is realized when the water pump runs; meanwhile, cooling liquid in a water tank on the inner wall of the shaft sleeve enters a gap between the shaft sleeve and the rotating shaft, and a hydraulic film is formed when the impeller rotor rotates at a high speed, so that the lubricating effect of the sliding bearing is achieved.

The technical scheme of the third aspect of the invention provides an electronic water pump, which comprises a pump shell, a controller, a stator component, a machine shell, a rotating shaft and an impeller rotor component according to any one of the technical schemes, wherein the machine shell is arranged between the pump shell and the controller, the impeller rotor component is inserted into the rotating shaft, and a shaft sleeve of the impeller rotor component is in clearance fit with the rotating shaft.

According to the electronic water pump provided by the technical scheme, the shaft sleeve is taken as a sliding bearing and is integrated with the rotor, the impeller rotor assembly is in clearance fit with the rotating shaft through the shaft sleeve, the matching length of the shaft sleeve and the rotating shaft is preferably 25-30 mm, the electronic water pump is stable in operation, the rotor does not eccentrically shake, and bearing fixing or aligning is not needed; when the water pump runs, the impeller rotor component moves axially, when the impeller rotor component moves towards the pump shell, the upper surface of the shaft sleeve rubs with a component at the bottom of the pump shell (such as a D-shaped gasket arranged at the bottom of the pump shell), when the impeller rotor component moves towards the bottom of the pump shell, the lower surface of the shaft sleeve rubs with the bottom of the pump shell, and the shaft sleeve is made of wear-resistant materials; preferably, the inner wall of the shaft sleeve is provided with a through groove which is communicated with an air gap between the stator assembly and the impeller rotor assembly, and when the water pump operates, the cooling liquid flows and rotates to realize self-cooling.

In the above technical solution, preferably, the casing is a casing injection molded body, the rotating shaft is embedded in the casing injection molded body, and the rotating shaft and the casing injection molded body become a casing rotating shaft assembly; or the whole injection molding of stator module forms, the casing is the casing injection molding body, the stator module plastic envelope is in inside the casing injection molding body, the pivot embedding inside the casing injection molding body, stator module the pivot with the casing injection molding body becomes the casing subassembly.

The rotating shaft and the shell can be fixed into a shell rotating shaft assembly through injection molding; the stator assembly can also be integrally formed by injection molding, and then the shell assembly is injection molded, so that the stator assembly is plastically packaged in the shell injection molding body to form self-sealing.

In the above technical solution, preferably, the pump casing is fixedly connected to the front end of the casing by a screw, and a first seal ring is installed between the pump casing and the casing; the controller is fixedly connected with the rear end of the machine shell through a screw, and a second sealing ring is arranged between the controller and the machine shell.

The pump shell and the controller are fixed with the shell through screws such as self-tapping screws; the rotating shaft and the shell are fixed through injection molding, the impeller rotor assembly is inserted into the rotating shaft, and the shaft sleeve and the rotating shaft form clearance fit; when the water pump runs, the impeller rotor component moves axially, when the impeller rotor component moves towards the pump shell, the upper surface of the shaft sleeve rubs with a component at the bottom of the pump shell (such as a D-shaped gasket arranged at the bottom of the pump shell), when the impeller rotor component moves towards the bottom of the machine shell, the lower surface of the shaft sleeve rubs with the bottom of the machine shell, and the shaft sleeve is made of wear-resistant materials.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow chart illustrating a molding process of an impeller rotor assembly of an electric water pump according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating a molding process of an impeller rotor assembly of an electric water pump according to another embodiment of the present invention;

FIG. 3 is an exploded view of an impeller rotor assembly of an electric water pump in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural view of a first impeller rotor assembly in accordance with one embodiment of the present invention;

FIG. 5 is a schematic structural view of a second impeller rotor assembly in accordance with one embodiment of the present invention;

FIG. 6 is a schematic structural view of a third impeller rotor assembly in accordance with one embodiment of the present invention;

FIG. 7 is a schematic view of an assembled structure of an impeller rotor assembly according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the electronic water pump of one embodiment of the present invention;

fig. 9 is a schematic structural view of a rotary shaft assembly of the casing according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 3 to 9 is:

1 axle sleeve, 2 magnet steel, 3 iron cores, 4 impeller main bodies, 41 welding grooves, 5 blades, 51 welding wires, 6 impeller rotor assembly I, 7 impeller rotor assembly II, 8 impeller rotor assembly III, 9 impeller rotor assembly, 10 electronic water pump, 11 pump shell, 12 controller, 13 stator module, 14 casing rotating shaft assembly, 15 second sealing ring, 16 casing, 17 rotating shaft.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An impeller rotor assembly of an electric water pump and a molding process thereof, and an electric water pump according to some embodiments of the present invention will be described with reference to fig. 1 to 9.

As shown in fig. 1 and 2, according to some embodiments of the present invention, a molding process of an impeller rotor assembly of an electric water pump includes the following steps:

s102, installing non-magnetized magnetic steel 2 in a magnetic steel groove of an iron core 3, then placing the iron core 3 and the magnetic steel 2 as a core mold I in an injection mold I to inject an impeller main body 4, and enabling the impeller main body 4, the iron core 3 and the magnetic steel 2 to become an impeller rotor assembly I6;

and S104, placing the impeller rotor assembly I6 as a core mold II in an injection mold II to be injected with a shaft sleeve 1, and enabling the shaft sleeve 1 and the impeller rotor assembly I6 to be an impeller rotor assembly II 7.

Preferably, the material of the injection molded impeller main body 4 in S102 is different from the material of the injection molded shaft sleeve 1 in S104, and the material of the injection molded impeller main body 4 is required to be high in strength and acid and alkali resistant; the material requirements of the injection molding shaft sleeve 1 are wear resistance, high strength and acid and alkali resistance; the two injection molding materials are thermoplastic materials; the material of moulding plastics that uses is different when impeller main part 4 and the respective injection moulding of axle sleeve 1, the material cost that axle sleeve 1 used of moulding plastics is high, the material cost that impeller main part 4 used of moulding plastics is low, compare in the impeller rotor subassembly of axle sleeve 1 and the integrative injection moulding of impeller main part 4, manufacturing cost has been saved to this scheme, because if adopt injection moulding once, the material that axle sleeve 1 used is wear-resisting, high strength, acid and alkali-resistance's material, this kind of material is also used to impeller main part 4, the cost is higher.

Impeller main part 4 is bulky, and axle sleeve 1 is small, and is fast when moulding plastics axle sleeve 1, can not cause the influence to impeller rotor subassembly 6, and circle fluting in the iron core 3, when the axle sleeve 1 of moulding plastics, the inslot of circle in the iron core 3 is filled to the injection molding material, makes axle sleeve 1 and 3 circumferencial directions of iron core can not skid.

In one embodiment, as shown in fig. 2, a molding process of an impeller rotor assembly of an electric water pump includes the following steps:

s102, installing non-magnetized magnetic steel 2 in a magnetic steel groove of an iron core 3, then placing the iron core 3 and the magnetic steel 2 as a core mold I in an injection mold I (the surface of the iron core 3 and the surface of the magnetic steel 2 (non-magnetized) are propped up and down by a thimble, and the central hole of the iron core 3 is taken as a reference) to inject and mold an impeller main body 4, wherein the impeller main body 4, the iron core 3 and the magnetic steel 2 form an impeller rotor assembly I6, as shown in FIG. 4; the injection molding material is filled into a circular groove in the iron core 3, so that the iron core 3 and the impeller main body 4 cannot rotate, the injection molding material is reinforced PPS (GF 30-40%), and the injection molding temperature is 300-330 ℃;

s104, placing the impeller rotor assembly I6 as a core mold II in an injection mold II (vertically positioning through a thimble and taking the excircle of the impeller rotor assembly I6 as a reference) to injection mold a shaft sleeve 1, wherein the shaft sleeve 1 and the impeller rotor assembly I6 form an impeller rotor assembly II 7, as shown in FIG. 5; the injection molding material is reinforced PPS (CF 10-30%), and the injection molding temperature is 300-330 ℃;

s105, injecting the blades 5 by using the material for injecting the impeller main body 4 in S102;

s106, the impeller rotor assembly II 7 and the blades 5 are welded into a whole through ultrasonic welding to form an impeller rotor assembly III 8, as shown in FIG. 6; the pulling-out force of the second impeller rotor assembly 7 and the blades 5 is greater than 1000N, and the welding seam is smaller than 0.1 mm;

and S108, magnetizing the impeller rotor assembly III 8 to obtain an impeller rotor assembly 9, as shown in FIG. 7.

The impeller main body 4 which is injection-molded in S102 is different from the shaft sleeve 1 which is injection-molded in S104 in injection-molding materials, the material cost for injection-molding the impeller main body 4 is lower than that for injection-molding the shaft sleeve 1, the shaft sleeve 1 is required to be wear-resistant, high-strength and acid-base resistant, and the impeller main body 4 is required to be high-strength and acid-base resistant and can be conveniently ultrasonically welded with the blades 5, so that the impeller main body 4 and the shaft sleeve 1 are made of two different injection-molding materials, and the S102 and the S104 are divided into two steps for injection-molding.

Step S105 of molding the blade 5 is not limited to be after S104, and may be before S104.

The impeller rotor assembly of the electronic water pump manufactured by the molding process comprises a shaft sleeve 1, magnetic steel 2, an iron core 3, an impeller main body 4 and blades 5, wherein the impeller main body 4 is formed by first injection molding, and the shaft sleeve 1 is formed by second injection molding; the impeller main body 4, the iron core 3, the magnetic steel 2 (not magnetized) and the shaft sleeve 1 are subjected to injection molding twice in steps S102 and S104 to form an impeller rotor assembly II 7, the blades 5 are subjected to injection molding in step S105, and an impeller rotor assembly III 8 is obtained in step S106; the impeller rotor assembly 9 is obtained by step S108.

The magnetic steel 2 is preferably made of neodymium iron boron material, the characteristic of the magnetic steel is high-temperature demagnetization, and the forming process of the impeller rotor assembly is to externally magnetize the formed third 8 impeller rotor assembly to obtain the impeller rotor assembly.

Preferably, the inner wall of the shaft sleeve 1 is provided with a through groove, a gap is formed between the stator assembly 13 and the impeller rotor assembly 9 of the electronic water pump 10, the through groove is communicated with the gap, and when the water pump operates, the cooling liquid flows to rotate so as to perform self-cooling.

The impeller rotor assembly II 7 and the blades 5 are formed through ultrasonic welding, welding lines 51 are arranged on the blades 5, welding grooves 41 are arranged on the impeller rotor assembly II 7, and the welding grooves 41 are obtained through injection molding of the impeller main body 4.

The injection molding body impeller main body 4 has a mistake proofing structure, and is correctly positioned when the impeller rotor assembly III 8 is magnetized, so that the magnetic steel 2 (not magnetized) is aligned to the magnetizing coil.

The electronic water pump provided by the embodiment of the invention, as shown in fig. 8, comprises a pump shell 11, a controller 12, an impeller rotor assembly 9, a stator assembly 13, a casing rotating shaft assembly 14 and a sealing ring; the pump shell 11 and the controller 12 are fixed with the machine shell 16 through screws such as self-tapping screws, a first sealing ring is arranged between the pump shell 11 and the machine shell 16, and a second sealing ring 15 is arranged between the controller 12 and the machine shell 16; the shell 16 is injection molded by taking the rotating shaft 17 as a core mold, and the shell 16 and the rotating shaft 17 become a shell rotating shaft assembly 14, as shown in fig. 9; the impeller rotor assembly 9 is inserted into the rotating shaft 17, and the shaft sleeve 1 and the rotating shaft 17 form clearance fit; the length of the shaft sleeve 1 and the length of the rotating shaft 17 in clearance fit are 25-30 mm, a hydraulic die is formed when the impeller rotor assembly 9 operates in a clearance between the impeller rotor assembly 9 and the rotating shaft 17, and the impeller rotor assembly 9 cannot deflect.

When electronic pump 10 operates, the drunkenness takes place for 9 axial of impeller rotor subassembly, and during toward the 11 direction drunkenness of pump case, 1 upper surface of axle sleeve rubs with 11 bottom parts of pump case (if locate the D type gasket of 11 bottoms of pump case), and when the drunkenness of 16 bottoms of casing, 1 lower surfaces of axle sleeve rubs with 16 bottoms of casing, and axle sleeve 1 adopts wear-resistant material: enhanced PPS (CF 10-30%).

According to the electronic water pump 10 provided by the scheme, the shaft sleeve 1 is integrated with the rotor as a sliding bearing, the rotating shaft 17 is fixed with the machine shell 16, the impeller rotor assembly 9 is inserted into the rotating shaft 17 to form clearance fit, the shaft sleeve 1 is made of wear-resistant materials, the inner wall of the shaft sleeve 1 is provided with the through groove and communicated with the air gap between the stator assembly 13 and the impeller rotor assembly 9, and cooling liquid flows when the water pump operates to realize self-cooling.

Of course, the stator module 13 may also be integrally formed by injection molding, and then the shell assembly is injection molded, the casing 16 is a casing injection molded body, the stator module 13 is plastically packaged inside the casing injection molded body, the rotating shaft 17 is embedded inside the casing injection molded body, and the stator module 13, the rotating shaft 17 and the casing injection molded body become the casing assembly, so that the stator module 13 is plastically packaged inside the casing injection molded body to form self-sealing.

Specifically, the electronic water pump is an electronic water pump for a vehicle.