Impeller rotor assembly of electronic water pump and molding process thereof and electronic water pump

Abstract

The present invention provides an impeller rotor assembly of an electronic water pump, a molding process thereof, and an electronic water pump. The impeller rotor assembly is mainly formed by two injection moldings: installing an unmagnetized magnetic steel in the magnetic steel slot of the iron core, and then placing the iron core and the magnetic steel as core mold one in injection mold one to inject the impeller body, and the impeller body, the iron core and the magnetic steel become the impeller rotor assembly one; placing the impeller rotor assembly one as core mold two in injection mold two to inject the sleeve, and the sleeve and the impeller rotor assembly one become the impeller rotor assembly two. In the above scheme, the impeller body and the sleeve are injection molded separately, so the impeller body can use a lower cost injection plastic, saving manufacturing costs; the sleeve is small in size and light in weight, and the sleeve is not easy to slip when the impeller rotor assembly rotates; the sleeve is small in size, and the speed of injection molding the sleeve is fast, which will not affect the impeller rotor assembly one, avoiding the risk of displacement of the iron core and the magnetic steel caused by the molten impeller body.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic water pumps, and in particular to a molding process for an impeller rotor assembly of an electronic water pump, an impeller rotor assembly of an electronic water pump manufactured by the molding process, and an electronic water pump comprising the impeller rotor assembly. Background Art

[0002] Currently, the impeller material of automotive electronic water pumps is aluminum, which is cast. The impeller blades and cover plates are connected to form blades by riveting. This structure is costly and heavy, and the riveting molding causes a large dynamic imbalance of the impeller.

[0003] Chinese patent document CN104061169A discloses an impeller rotor structure, which adopts two-step injection molding. In the first step, the rotor core and magnetic steel are injected, and in the second step, the first step injection molding body is used as a core mold to inject the impeller to form an impeller rotor assembly as a whole. There are the following disadvantages: 1) The rotor shaft hole acts as a sliding bearing and rubs against the rotating shaft, so wear-resistant materials must be used. The impeller and the rotor shaft hole are an integral whole. The impeller uses reinforced PPS (CF10%), which increases the cost of the impeller; 2) Since different materials are used for the two injection moldings, the inner wall of the rotor assembly is not firmly bonded to the impeller, and the impeller The rotor is heavy, and a relatively large torque is required to drive the impeller to rotate, which will cause the rotor and the impeller to loosen. The patent designs two front and rear limit plates to fix the rotor. This structure increases the cost and still cannot solve the risk of slipping between the rotor assembly and the impeller in the circumferential direction; 3) The first injection molding uses reinforced PPS (GF30%), and the second injection molding uses PPS (CF10%). Both are thermoplastic materials, and the injection melting temperature is 300-330°C. The second injection molding impeller is relatively large in volume and the injection molding time is long. It is easy to melt the injection molded body formed after the first injection molding, and there is a risk of displacement of the iron core and the magnetic steel. Summary of the invention

[0004] The present invention aims to solve at least one of the above technical problems.

[0005] To this end, the purpose of the first aspect of the present invention is to provide a molding process for an impeller rotor assembly of an electronic water pump.

[0006] The second aspect of the present invention aims to provide an impeller rotor assembly for an electronic water pump manufactured by the above-mentioned molding process.

[0007] The third aspect of the present invention aims to provide an electronic water pump comprising the impeller rotor assembly described above.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the first aspect of the present invention provides a molding process of an impeller rotor assembly of an electronic water pump, including: S102, installing an unmagnetized magnetic steel in the magnetic steel slot of the iron core, and then placing the iron core and the magnetic steel as core mold one in an injection mold one to injection mold an impeller body, and the impeller body, the iron core and the magnetic steel become an impeller rotor assembly one; S104, placing the impeller rotor assembly one as core mold two in an injection mold two to injection mold a sleeve, and the sleeve and the impeller rotor assembly one become an impeller rotor assembly two.

[0009] The above scheme provides a molding process for the impeller rotor assembly of the electronic water pump, and the rotor includes an iron core, a magnetic steel and a sleeve. The rotor and the impeller body are molded by a two-step injection molding process. The first step is to injection mold the impeller body, and the second step is to injection mold the sleeve. In this way, the injection molding materials used for the impeller body and the sleeve can be different. The material requirements for the injection molded impeller body are high strength and acid and alkali resistance, and the material requirements for the injection molded sleeve are wear resistance, high strength, acid and alkali resistance. The material cost used for the injection molded sleeve is high, and the material cost used for the injection molded impeller body is low. Compared with the impeller rotor assembly in the related art in which the sleeve and the impeller body are integrally injected, this scheme saves manufacturing costs, because if one-step injection molding is adopted, the material used for the sleeve is wear-resistant, high-strength, acid and alkali resistant material, and the impeller body also uses this material, which is more expensive.

[0010] Secondly, in the above scheme, the iron core and the magnet are plastic-sealed in the impeller body, and the iron core and the magnet are firmly bonded to the impeller body; the sleeve is small in size and light in weight. When the impeller rotor assembly rotates, the torque that drives the sleeve to rotate is small, and the sleeve is not easy to slip. Therefore, the above scheme has well solved the risk of slipping between the rotor assembly and the impeller in the circumferential direction in the related technology; thirdly, the impeller body is large in size and the sleeve is small in size. The speed of injection molding the sleeve is fast, and it will not affect the impeller rotor assembly. That is, the impeller body molded by the first injection molding will not be melted during the second injection molding of the sleeve. Therefore, the above scheme has well avoided the risk of the injection molded body formed after the first injection molding being melted during the second injection molding of the impeller in the related technology, causing the iron core and the magnet to shift.

[0011] In addition, the molding process of the impeller rotor assembly of the electronic water pump provided in the above technical solution of the present invention may also have the following additional technical features:

[0012] In the above technical solution, preferably, the material of the impeller body injection-molded in S102 is inconsistent with the material of the shaft sleeve injection-molded in S104, and the material cost of the impeller body injection-molded in S102 is lower than the material cost of the shaft sleeve injection-molded in S104.

[0013] The impeller body and the shaft sleeve are each injection molded using different injection molding materials. The material cost used for injection molding the shaft sleeve is high, while the material cost used for injection molding the impeller body is low. Compared with the impeller rotor assembly in which the shaft sleeve and the impeller body are integrally injection molded, this solution saves manufacturing costs. This is because if one-time injection molding is used, the material used for the shaft sleeve is a wear-resistant, high-strength, acid- and alkali-resistant material, and the impeller body also uses this material, which is more expensive.

[0014] In the above technical solution, preferably, the inner circle of the iron core is grooved, and the injection plastic of the sleeve is injected in S104 to fill the groove of the inner circle of the iron core.

[0015] The inner circle of the core is grooved, and when the sleeve is injection molded, the injection plastic is filled into the groove of the inner circle of the core, so that the sleeve and the core will not slip in the circumferential direction, thereby effectively avoiding the risk of slipping between the rotor assembly and the impeller in the circumferential direction in the related technology.

[0016] In the above technical solution, preferably, after S104, it also includes: S106, ultrasonically welding the impeller rotor component 2 and the blades into one to form an impeller rotor component 3; S108, magnetizing the impeller rotor component 3 to obtain the impeller rotor component.

[0017] The impeller includes an impeller body and blades. The impeller is formed by an ultrasonic welding process. The blades are ultrasonically welded to the impeller rotor component 2 to form an impeller rotor component 3. The injection mold for integral injection molding of the impeller has a complex structure and high maintenance cost. Therefore, the impeller is divided into two parts, the impeller body and the blades, and they are injection molded separately. A welding line is designed on one of the blades and the impeller rotor component 2, and a welding groove is designed on the other. For example, a welding line is designed on the blade and a welding groove is designed on the impeller rotor component 2, and then ultrasonic welding is used for molding. The structure of the injection mold is simple, which greatly reduces the maintenance cost of the injection mold.

[0018] In the above technical solution, preferably, before S106, it also includes: S105, injection molding the blades with the material used to injection mold the impeller body in S102.

[0019] The blades are injection molded using the material of the injection-molded impeller body, which not only facilitates the molding of the blades, but also facilitates the ultrasonic welding operation between the blades and the impeller body.

[0020] 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 the molding process of the impeller-rotor assembly of the electronic water pump as described in any of the above technical solutions, and includes: an impeller and a rotor, the impeller includes an impeller body and blades, the rotor includes an iron core, a magnetic steel and a sleeve, the iron core is provided with a magnetic steel groove, the magnetic steel is installed in the magnetic steel groove, the iron core and the magnetic steel are plastic-sealed inside the impeller body to form an impeller-rotor assembly one, and the sleeve is secondary injection molded in the impeller-rotor assembly one to form an impeller-rotor assembly two.

[0021] The impeller rotor assembly of the electronic water pump provided by the above scheme includes two parts, an impeller and a rotor. The impeller includes an impeller body and blades; the rotor includes an iron core, a magnetic steel, and a shaft sleeve. The rotor and the impeller body are molded by a two-step injection molding process. The first step is to injection mold the impeller body, and the second step is to injection mold the shaft sleeve. In this way, the impeller body and the shaft sleeve are injection molded separately, so the impeller body can use a lower-cost injection plastic, saving manufacturing costs; the iron core and the magnetic steel are plastic-sealed inside the impeller body and are firmly bonded. The shaft sleeve is small in size and light in weight, and the shaft sleeve is not easy to slip when the impeller rotor assembly rotates; the shaft sleeve is small in size and the speed of injection molding the shaft sleeve is fast, which will not affect the impeller rotor assembly, thereby avoiding the risk of displacement of the iron core and the magnetic steel caused by the melting impeller body.

[0022] In the above technical solution, preferably, a through groove is provided on the inner wall of the sleeve.

[0023] There are through grooves on the inner wall of the sleeve, and there is an air gap between the stator assembly of the electronic water pump and the impeller rotor assembly. The two form a water path, and the water pump achieves self-cooling when it is running; at the same time, the coolant in the water groove on the inner wall of the sleeve enters the gap between the sleeve and the shaft, forming a hydraulic film when the impeller rotor rotates at high speed, which plays a role in lubricating the sliding bearing.

[0024] The technical solution of the third aspect of the present invention provides an electronic water pump, comprising a pump casing, a controller, a stator assembly, a casing, a rotating shaft and an impeller rotor assembly as described in any of the above technical solutions, wherein the casing is installed between the pump casing and the controller, the impeller rotor assembly is inserted into the rotating shaft, and the shaft sleeve of the impeller rotor assembly forms a clearance fit with the rotating shaft.

[0025] In the electronic water pump provided by the above technical solution of the present invention, the shaft sleeve is integrated with the rotor as a sliding bearing, and the impeller rotor assembly is clearance-matched with the rotating shaft through the shaft sleeve. Preferably, the matching length of the shaft sleeve and the rotating shaft is 25 to 30 mm. The operation is stable, the rotor will not shake eccentrically, and no bearing fixation or alignment is required. When the water pump is running, the impeller rotor assembly moves axially. When it moves toward the pump casing, the upper surface of the shaft sleeve rubs against the bottom component of the pump casing (such as the D-type gasket provided at the bottom of the pump casing). When it moves toward the bottom of the casing, the lower surface of the shaft sleeve rubs against the bottom of the casing, and the shaft sleeve is made of wear-resistant material. Preferably, a through groove is opened on the inner wall of the shaft sleeve, which is connected to the air gap between the stator assembly and the impeller rotor assembly. When the water pump is running, the coolant circulates to achieve self-cooling.

[0026] 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 form a casing rotating shaft assembly; or the stator assembly is integrally injection-molded, the casing is a casing injection-molded body, the stator assembly is plastic-sealed in the casing injection-molded body, the rotating shaft is embedded in the casing injection-molded body, and the stator assembly, the rotating shaft and the casing injection-molded body form a casing assembly.

[0027] The shaft and the casing can be fixed by injection molding to form a casing shaft assembly; the stator assembly can also be integrally injection molded, and then the casing assembly is injection molded, so that the stator assembly is plastic-sealed inside the casing injection molding to form a self-sealing.

[0028] In the above technical solution, preferably, the pump casing is fixedly connected to the front end of the casing by screws, and a first sealing ring is installed between the pump casing and the casing; the controller is fixedly connected to the rear end of the casing by screws, and a second sealing ring is installed between the controller and the casing.

[0029] The pump housing and controller are fixed to the housing by screws such as self-tapping screws; the rotating shaft and the housing are fixed by injection molding, the impeller rotor assembly is inserted into the rotating shaft, and the shaft sleeve and the rotating shaft form a clearance fit; when the water pump is running, the impeller rotor assembly moves axially, and when it moves toward the pump housing, the upper surface of the shaft sleeve rubs against the bottom component of the pump housing (such as the D-type gasket provided at the bottom of the pump housing), and when it moves toward the bottom of the housing, the lower surface of the shaft sleeve rubs against the bottom of the housing, and the shaft sleeve is made of wear-resistant material.

[0030] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1It is a schematic flow chart of a molding process of an impeller rotor assembly of an electronic water pump according to an embodiment of the present invention;

[0033] Figure 2 is a schematic flow chart of a molding process of an impeller rotor assembly of an electronic water pump according to another embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the exploded structure of an impeller rotor assembly of an electronic water pump according to an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of an impeller rotor assembly 1 according to an embodiment of the present invention;

[0036] Figure 5 is a structural schematic diagram of an impeller rotor assembly 2 according to an embodiment of the present invention;

[0037] Figure 6 is a structural schematic diagram of an impeller rotor assembly three according to an embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the assembly structure of an impeller rotor assembly according to an embodiment of the present invention;

[0039] Figure 8 is a schematic structural diagram of an electronic water pump according to an embodiment of the present invention;

[0040] Fig. 9 It is a schematic structural diagram of a housing shaft assembly according to an embodiment of the present invention.

[0041] in, Figures 3 to 9 The corresponding relationship between the reference numerals and component names in the figure is:

[0042] 1 sleeve, 2 magnetic steel, 3 iron core, 4 impeller body, 41 welding groove, 5 blade, 51 welding wire, 6 impeller rotor assembly one, 7 impeller rotor assembly two, 8 impeller rotor assembly three, 9 impeller rotor assembly, 10 electronic water pump, 11 pump housing, 12 controller, 13 stator assembly, 14 casing shaft assembly, 15 second sealing ring, 16 casing, 17 shaft. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] Refer to the following Figures 1 to 9 An impeller rotor assembly of an electronic water pump and a molding process thereof, as well as an electronic water pump according to some embodiments of the present invention are described.

[0046] like Figure 1 and Figure 2 As shown, a molding process of an impeller rotor assembly of an electronic water pump provided in some embodiments of the present invention includes the following steps:

[0047] S102, installing the unmagnetized magnetic steel 2 in the magnetic steel slot of the iron core 3, and then placing the iron core 3 and the magnetic steel 2 as a core mold 1 in an injection mold 1 to injection mold an impeller body 4, and the impeller body 4, the iron core 3 and the magnetic steel 2 become an impeller rotor assembly 6;

[0048] S104, placing the impeller rotor assembly 1 6 as the core mold 2 in the injection mold 2 to inject the sleeve 1, and the sleeve 1 and the impeller rotor assembly 1 6 become the impeller rotor assembly 2 7.

[0049] Preferably, the material of the injection-molded impeller body 4 in S102 is inconsistent with the material of the injection-molded sleeve 1 in S104. The material requirements for the injection-molded impeller body 4 are high strength and acid and alkali resistance; the material requirements for the injection-molded sleeve 1 are wear-resistant, high strength, and acid and alkali resistance; both injection molding materials are thermoplastic materials; the injection molding materials used for the impeller body 4 and the sleeve 1 are different, the material cost used for the injection-molded sleeve 1 is high, and the material cost used for the injection-molded impeller body 4 is low. Compared with the impeller rotor assembly in which the sleeve 1 and the impeller body 4 are integrally injection molded, this solution saves manufacturing costs, because if one-time injection molding is adopted, the material used for the sleeve 1 is wear-resistant, high strength, acid and alkali resistant material, and the impeller body 4 also uses this material, which is more expensive.

[0050] The impeller body 4 is large in size, and the sleeve 1 is small in size. The speed of injection molding of the sleeve 1 is fast, and it will not affect the impeller rotor assembly 6. The inner circle of the iron core 3 is grooved. When the sleeve 1 is injection molded, the injection plastic is filled into the groove of the inner circle of the iron core 3, so that the sleeve 1 and the iron core 3 will not slip in the circumferential direction.

[0051] In a specific embodiment, Figure 2 As shown, the molding process of the impeller rotor assembly of the electronic water pump includes the following steps:

[0052] S102, install the unmagnetized magnetic steel 2 in the magnetic steel slot of the iron core 3, and then place the iron core 3 and the magnetic steel 2 as a core mold 1 in an injection mold 1 (using a pin to push the surface of the iron core 3 and the surface of the magnetic steel 2 (unmagnetized) up and down to position them, with the hole in the iron core 3 as a reference) to inject the impeller body 4, and the impeller body 4, the iron core 3 and the magnetic steel 2 become an impeller rotor assembly 6, as shown in FIG. Figure 4 As shown; the injection molding material is filled into the inner circular groove of the iron core 3 so that the iron core 3 and the impeller body 4 will not rotate. The injection molding material is reinforced PPS (GF30-40%), and the injection molding temperature is 300-330°C;

[0053] S104, the impeller rotor assembly 1 6 is placed as the core mold 2 in the injection mold 2 (positioned up and down by the ejector pin, with the outer circle of the impeller rotor assembly 1 6 as the reference) to inject the sleeve 1, and the sleeve 1 and the impeller rotor assembly 1 6 become the impeller rotor assembly 2 7, as shown in FIG. Figure 5 As shown; the injection molding material is reinforced PPS (CF10-30%), and the injection molding temperature is 300-330°C;

[0054] S105, using the material of the impeller body 4 injected in S102 to inject blades 5;

[0055] S106, the impeller rotor component 2 7 and the blade 5 are ultrasonically welded into one piece to form the impeller rotor component 3 8. Figure 6 As shown; the pull-off force of the impeller rotor assembly 2 7 and the blade 5 is greater than 1000N, and the weld is less than 0.1mm;

[0056] S108, magnetizing the impeller rotor assembly 8 to obtain the impeller rotor assembly 9, such as Figure 7 shown.

[0057] The impeller body 4 injection-molded by S102 and the sleeve 1 injection-molded by S104 are made of different injection materials. The material cost used for the injection molding of the impeller body 4 is lower than the material cost used for the injection molding of the sleeve 1. The required characteristics of the sleeve 1 are wear resistance, high strength, and acid and alkali resistance. The required characteristics of the impeller body 4 are high strength and acid and alkali resistance, and it must be easy to perform ultrasonic welding with the blades 5. Therefore, two different injection materials are selected for the impeller body 4 and the sleeve 1, and S102 and S104 are divided into two steps of injection molding.

[0058] It should be noted that step S105 of injecting the blade 5 is not limited to being performed after S104 , but may also be performed before S104 .

[0059] The impeller rotor assembly of the electronic water pump manufactured by the above molding process, such as Figure 3As shown, it includes a sleeve 1, a magnetic steel 2, an iron core 3, an impeller body 4, and blades 5, wherein the impeller body 4 is injection molded for the first time, and the sleeve 1 is injection molded for the second time; the impeller body 4 and the iron core 3, the magnetic steel 2 (not magnetized), and the sleeve 1 are injection molded twice through steps S102 and S104 to form an impeller rotor component 2 7, the blades 5 are injection molded through step S105, and the impeller rotor component 3 8 is obtained through step S106; the impeller rotor component 9 is obtained through step S108.

[0060] The magnetic steel 2 is preferably made of neodymium iron boron material, which has the characteristic of high-temperature demagnetization. The molding process of the impeller rotor assembly is to perform external magnetization on the formed impeller rotor assembly 3 8 to obtain the impeller rotor assembly.

[0061] Preferably, a through groove is formed on the inner wall of the shaft sleeve 1, and a gap is provided between the stator assembly 13 of the electronic water pump 10 and the impeller rotor assembly 9, and the through groove is connected to the gap, so that the coolant flows when the water pump is running for self-cooling.

[0062] The impeller rotor component 2 7 and the blade 5 are formed by ultrasonic welding, the welding line 51 is set on the blade 5, the welding groove 41 is set on the impeller rotor component 2 7, and the welding groove 41 is obtained by injection molding the impeller body 4.

[0063] The injection molded impeller body 4 has an error-proof structure, which allows the impeller rotor assembly 3 8 to be correctly positioned when magnetizing, so that the magnetic steel 2 (unmagnetized) is aligned with the magnetizing coil.

[0064] The electronic water pump provided by the embodiment of the present invention is as follows: Figure 8 As shown, it includes a pump housing 11, a controller 12, an impeller rotor assembly 9, a stator assembly 13, a housing shaft assembly 14, and a sealing ring; the pump housing 11 and the controller 12 are fixed to the housing 16 by screws such as self-tapping screws, a first sealing ring is installed between the pump housing 11 and the housing 16, and a second sealing ring 15 is installed between the controller 12 and the housing 16; the housing 16 is three-injected by using the shaft 17 as a core mold, and the housing 16 and the shaft 17 become the housing shaft assembly 14, as shown in FIG. Fig. 9 As shown; the impeller rotor assembly 9 is inserted into the rotating shaft 17, and the sleeve 1 and the rotating shaft 17 form a clearance fit; the clearance fit length between the sleeve 1 and the rotating shaft 17 is 25 to 30 mm, and the coolant is in the gap between the impeller rotor assembly 9 and the rotating shaft 17. When the impeller rotor assembly 9 is running, a hydraulic mold is formed, and the impeller rotor assembly 9 will not swing.

[0065] When the electronic water pump 10 is running, the impeller rotor assembly 9 moves axially. When it moves toward the pump casing 11, the upper surface of the sleeve 1 rubs against the bottom component of the pump casing 11 (such as the D-type gasket provided at the bottom of the pump casing 11). When it moves toward the bottom of the casing 16, the lower surface of the sleeve 1 rubs against the bottom of the casing 16. The sleeve 1 is made of wear-resistant material: reinforced PPS (CF10~30%).

[0066] In the electronic water pump 10 provided by the above scheme, the sleeve 1 is integrated with the rotor as a sliding bearing, the rotating shaft 17 is fixed to the casing 16, the impeller rotor assembly 9 is inserted into the rotating shaft 17 to form a clearance fit, the sleeve 1 is made of wear-resistant material, and the inner wall of the sleeve 1 is provided with a through groove, which is connected to the air gap between the stator assembly 13 and the impeller rotor assembly 9. When the water pump is running, the coolant circulates to achieve self-cooling.

[0067] Of course, the stator assembly 13 can also be injection molded as a whole, and then the casing assembly can be injection molded. The casing 16 is the casing injection molding body, the stator assembly 13 is sealed inside the casing injection molding body, and the shaft 17 is embedded in the casing injection molding body. The stator assembly 13, the shaft 17 and the casing injection molding body become the casing assembly, so that the stator assembly 13 is sealed inside the casing injection molding body to form a self-sealing.

[0068] Specifically, the electronic water pump is a vehicle electronic water pump.

[0069] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0070] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A molding process for an impeller rotor assembly of an electronic water pump, characterized in that: The impeller rotor assembly includes an impeller, and the impeller includes an impeller body and blades. The molding process of the impeller rotor assembly of the electronic water pump includes: S102, installing an unmagnetized magnetic steel in the magnetic steel slot of the iron core, and then placing the iron core and the magnetic steel as a core mold 1 in an injection mold 1 to injection mold the impeller body, and the impeller body, the iron core and the magnetic steel become an impeller rotor assembly 1; S104, placing the impeller rotor assembly 1 as a core mold 2 in an injection mold 2 to inject a shaft sleeve, and the shaft sleeve and the impeller rotor assembly 1 become the impeller rotor assembly 2; S105, injection molding the blades using the material of the impeller body injection molded in S102; The material of the impeller body injected in S102 is inconsistent with the material of the shaft sleeve injected in S104; The electronic water pump further comprises a stator assembly, at least part of the impeller rotor assembly is located on the inner periphery of the stator assembly; The shaft sleeve is made of wear-resistant material; The blades are connected to the impeller body; The material cost of injection molding the impeller body in S102 is lower than the material cost of injection molding the shaft sleeve in S104; The inner circle of the iron core is grooved, and the injection plastic of the shaft sleeve is filled in the groove of the inner circle of the iron core in S104; The impeller body and the blades are integrated into one by ultrasonic welding.

2. The molding process of the impeller rotor assembly of the electronic water pump according to claim 1, characterized in that: After S104, it also includes: S106, welding the impeller rotor assembly 2 and the blades into one piece by ultrasonic welding to form an impeller rotor assembly 3; S108, performing magnetization treatment on the impeller rotor assembly three to obtain an impeller rotor assembly.

3. An impeller rotor assembly of an electronic water pump, characterized in that: The impeller rotor assembly of the electronic water pump is manufactured by the molding process of claim 1 or 2, comprising: An impeller and a rotor, wherein the impeller comprises an impeller body and blades, and the rotor comprises an iron core, a magnet and a sleeve, wherein the iron core is provided with a magnet groove, and the magnet is installed in the magnet groove, and the iron core and the magnet are plastic-sealed inside the impeller body to form an impeller rotor component 1, and the sleeve is secondary-injected in the impeller rotor component 1 to form an impeller rotor component 2.

4. The impeller rotor assembly of the electronic water pump according to claim 3, characterized in that: A through groove is provided on the inner wall of the shaft sleeve.

5. An electronic water pump, characterized in that: It comprises a pump casing, a controller, a stator assembly, a casing, a rotating shaft and the impeller rotor assembly as described in claim 3 or 4, wherein the casing is installed between the pump casing and the controller, the impeller rotor assembly is inserted into the rotating shaft, and the shaft sleeve of the impeller rotor assembly forms a clearance fit with the rotating shaft.

6. The electronic water pump according to claim 5, characterized in that: The housing is an injection-molded housing body, the shaft is embedded in the injection-molded housing body, and the shaft and the injection-molded housing body form a housing shaft assembly; or The stator assembly is integrally formed by injection molding, the casing is a casing injection molding body, the stator assembly is sealed inside the casing injection molding body, the rotating shaft is embedded inside the casing injection molding body, and the stator assembly, the rotating shaft and the casing injection molding body form a casing assembly.

7. The electronic water pump according to claim 5, characterized in that: The pump housing is fixedly connected to the front end of the housing by screws, and a first sealing ring is installed between the pump housing and the housing; The controller is fixedly connected to the rear end of the housing through screws, and a second sealing ring is arranged between the controller and the housing.

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