Rear magnetizing type rotor mechanism and water pump applying same

Abstract

The utility model discloses a rear magnetizing type rotor mechanism and a water pump using the same. The rear magnetizing type rotor mechanism comprises a rotor assembly, the rotor assembly comprises a rotor iron core, a rotor outer sleeve component, a rotor end cover component and a plurality of magnetic steel sheets; magnetic steel jacks with the number corresponding to that of the magnetic steel sheets are formed in the rotor iron core, and the magnetic steel sheets are respectively inserted into the magnetic steel jacks of the rotor iron core in an unmagnetized state; the two ends of the rotor iron core are respectively provided with a rotor end cover component, and the rotor outer sleeve component is sleeved on the rotor iron core and the rotor end cover components so as to fasten the rotor iron core and the rotor end cover components; and after assembly is completed, magnetizing the rotor assembly so as to at least magnetize the magnetic steel sheets. The utility model mainly solves the problem of how to provide a rotor mechanism which is easy to assemble and low in reworking rate for the electronic water pump. The assembly difficulty of the non-magnetized magnetic steel sheets can be greatly reduced, and the operation of automatic equipment is facilitated, so that the assembly efficiency of the rotor mechanism is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic water pumps and their components, specifically to a post-magnetized rotor mechanism and a water pump using the same. Background Technology

[0002] Electric water pumps have high output efficiency and can achieve precise flow control. Therefore, they are widely used in automobiles, home appliances and industrial equipment. For example, new energy vehicles are usually equipped with two or more electric water pumps as the power source for the entire cooling system.

[0003] The rotor assembly is one of the core components of an electronic water pump. Its mechanical structure, electromagnetic structure, and assembly precision all directly affect the performance of the electronic water pump.

[0004] In existing rotor assemblies, one widely used design structure involves inserting permanent magnets (also known as magnets or magnet tiles) into the rotor core (also known as a yoke). Specifically, the permanent magnets are pre-magnetized and then inserted into slots in the rotor core according to the N / S polarity requirements.

[0005] Inserting permanent magnets into the slots of the rotor core is a precision operation. However, the magnetized permanent magnets have strong magnetism, making the insertion process difficult and time-consuming. In addition, operational errors may lead to N / S polarity errors, which may cause the rotor assembly to malfunction after installation.

[0006] In conclusion, how to provide an easy-to-assemble rotor mechanism with low rework rate for electric water pumps has become one of the urgent problems to be solved. Utility Model Content

[0007] The purpose of this invention is to provide a post-magnetized rotor mechanism and a water pump using it, which has the characteristics of easy assembly and low rework rate.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a post-magnetized rotor mechanism, comprising a rotor assembly; the rotor assembly includes a rotor core, a rotor outer sleeve component, a rotor end cap component, and a plurality of magnets; the rotor core has magnet insertion holes corresponding to the number of magnets, and the magnets, in an unmagnetized state, are respectively inserted into the respective magnet insertion holes of the rotor core; the rotor end cap component is respectively provided at both ends of the rotor core, and the rotor outer sleeve component is fitted onto the rotor core and the rotor end cap component to fasten the rotor core and the rotor end cap component; after assembly, the rotor assembly is magnetized to at least magnetize the magnets.

[0009] In the above technical solution, the post-magnetized rotor mechanism of this utility model further includes a rotating shaft component; a first shaft hole is formed on the rotor core, and a second shaft hole is formed on the rotor end cover component; the rotating shaft component passes through the first shaft hole of the rotor core and the second shaft hole of the rotor end cover component respectively, and is fixed to the rotor core and the rotor end cover component respectively.

[0010] In the above technical solution, the outer edge of the rotor end cover component is folded to form an outer flange, and the outer flange has an inlet edge; the rotor end cover component is introduced into the inner ring of the rotor outer sleeve component through the inlet edge of the outer flange, and the rotor end cover component is interference-fitted with the rotor outer sleeve component through the outer flange.

[0011] In the above technical solution, the second shaft hole of the rotor end cover component is folded to form an inner flange; the inner flange of the rotor end cover component is clearance-fitted with the rotating shaft component.

[0012] In the above technical solution, the rotor core of the rotor assembly has an axially penetrating subtractive positioning hole; the rotor end cover component of the rotor assembly is stamped to form a positioning protrusion on the inner side of the rotor end cover component; the positioning protrusion of the rotor end cover component is engaged in the subtractive positioning hole of the rotor core.

[0013] In the above technical solution, the number of subtractive positioning holes in the rotor core is 0.5 times or 1 times the number of magnetic poles of the rotor assembly.

[0014] In the above technical solution, an auxiliary hole is also formed at the rotor core, which penetrates the rotor core axially.

[0015] In the above technical solution, the inner diameter of the subtractive positioning hole of the rotor core is larger than the outer diameter of the positioning protrusion of the rotor end cover component; and the width of the auxiliary hole of the rotor core at its widest point is smaller than the outer diameter of the positioning protrusion of the rotor end cover component.

[0016] In the above technical solution, after the rotor end cover component of the rotor assembly is stamped, a positioning groove is formed on the outer side of the rotor end cover component corresponding to the positioning protrusion.

[0017] A water pump comprising the aforementioned post-magnetized rotor mechanism.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: In the post-magnetized rotor mechanism of this utility model, the magnets are inserted into the magnet holes of the rotor core in an unmagnetized state. After assembly, the rotor assembly is magnetized to at least magnetize the magnets. The unmagnetized magnets significantly reduce the assembly difficulty and facilitate the operation of automated equipment, thereby effectively improving the assembly efficiency of the rotor mechanism. Since the magnetization process is carried out after assembly, the problem of incorrect magnetic pole direction is less likely to occur, ensuring the consistency and yield of the rotor mechanism. After magnetization, the electromagnetic performance of the entire post-magnetized rotor mechanism can be tested simultaneously. Compared with only testing the magnetism of the incoming material (i.e., the pre-magnetized magnets), testing the performance indicators of the entire post-magnetized rotor mechanism is more conducive to avoiding other factors affecting performance and testing errors, thereby ensuring the performance consistency of the water pump assembly and enhancing the market competitiveness of electronic water pump products. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is an exploded view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the present invention.

[0022] The attached figures are labeled as follows: 1. Rotor assembly; 11. Rotor core; 111. Magnet insertion hole; 112. Subtractive material positioning hole; 113. First shaft hole; 114. Auxiliary hole; 12. Magnet sheet; 13. Rotor outer sleeve component; 14. Rotor end cover component; 141. Positioning protrusion; 142. Positioning groove; 143. Second shaft hole; 1431. Inner flange; 144. Outer flange; 2. Rotating shaft component. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This embodiment provides a post-magnetized rotor mechanism that can be used as the rotor mechanism of a water pump (especially an electronic water pump).

[0025] Please see Figures 1-3 The post-magnetized rotor mechanism of this embodiment includes rotor assembly 1.

[0026] The rotor assembly 1 includes a rotor core 11, a rotor outer sleeve component 13, a rotor end cover component 14, and a number of magnets 12.

[0027] The rotor core 11 is a solid component made of several stacked silicon steel sheets, which serves as the structural foundation and magnetic conductor of the rotor assembly 1. The rotor outer sleeve component 13 (also known as a steel sleeve) is a thin cylindrical steel component that can be interference-fitted with the rotor core 11. The rotor end cover component 14 is a thin circular steel cover that can also be interference-fitted with the rotor outer sleeve component 13. The magnetic steel sheet 12 (also known as a magnetic tile) consists of several pieces, all of which are block-shaped neodymium iron boron components that have permanent magnetism after being magnetized.

[0028] The rotor core 11 has magnet insertion holes 111 corresponding to the number of magnet plates 12. The magnet insertion holes 111 are suitable for inserting the magnet plates 12 into them. When the magnet plates 12 are not magnetized, they are respectively inserted into each magnet insertion hole 111 of the rotor core 11.

[0029] It should be noted that automatic assembly equipment or manual labor can be used to insert the unmagnetized magnets 12 into the magnet sockets 111 of the rotor core 11. The magnets 12 can be interference-fitted with the magnet sockets 111, or they can be fixed in the magnet sockets 111 with adhesive.

[0030] Rotor end cap components 14 are provided at both ends of the rotor core 11. Rotor outer sleeve component 13 is sleeved on the rotor core 11 and the rotor end cap component 14 to fasten the rotor core 11 and the rotor end cap component 14.

[0031] After assembly, the rotor assembly 1 is magnetized to at least magnetize the magnetic steel sheet 12.

[0032] The post-magnetized rotor mechanism of this embodiment also includes a shaft component 2, wherein the shaft component 2 is a metal shaft with an outer contour that is approximately cylindrical; a first shaft hole 113 is formed on the rotor core 11, the first shaft hole 113 is located at the axial center of the rotor core 11 and is adapted to be interference-fitted with the shaft component 2; a second shaft hole 143 is formed on the rotor end cover component 14, the second shaft hole 143 is located at the axial center of the rotor end cover component 14; the shaft component 2 passes through the first shaft hole 113 of the rotor core 11 and the second shaft hole 143 of the rotor end cover component 14 respectively, and is fixed to the rotor core 11 and the rotor end cover component 14 respectively.

[0033] Specifically, the outer edge of the rotor end cover member 14 is folded to form an outer flange 144, and the outer flange 144 has an inlet edge. In this embodiment, the rotor end cover member 14 is stamped to obtain the outer flange 144, wherein the inlet edge has a rounded corner structure. The rotor end cover member 14 is introduced into the inner ring of the rotor outer sleeve member 13 through the inlet edge of the outer flange 144 (i.e., the inlet edge and the rotor outer sleeve member 13 are clearance-fitted). Furthermore, the rotor end cover member 14 is interference-fitted with the rotor outer sleeve member 13 through the outer flange 144. That is, in this embodiment, the rotor end cover member 14 is introduced into the inner ring of the rotor outer sleeve member 13 through the rounded corner structure of the outer flange 144, and the rotor end cover member 14 is interference-fitted with the rotor outer sleeve member 13 through the outer flange 144. In this way, the rotor core 11, the rotor end cover member 14, and the rotor outer sleeve member 13 can be fastened together as one unit.

[0034] In some preferred embodiments, the height of the outer flange 144 of the rotor end cover component 14 is ≥2mm, the overlap height of the entire outer flange 144 (including the guide edge) of the rotor end cover component 14 with the rotor outer sleeve component 13 is ≥1.5mm, and the interference fit length between the outer flange 144 of the rotor end cover component 14 and the rotor outer sleeve component 13 is ≥0.5mm, thereby providing sufficient fitting force for the rotor end cover component 14 and the rotor outer sleeve component 13.

[0035] Specifically, the rotor end cover component 14 is folded at the second shaft hole 143 to form an inner flange 1431. In this embodiment, the rotor end cover component 14 is stamped to obtain the inner flange 1431. The inner flange 1431 of the rotor end cover component 14 is clearance-fitted with the rotating shaft component 2. It should be noted that the height of the inner flange 1431 of the rotor end cover component 14 is ≥2mm, and the overlap height between the inner flange 1431 of the rotor end cover component 14 and the rotating shaft component 2 is ≥1.5mm. The inner flange 1431 is provided so that the rotor assembly 1 can be coaxially positioned with respect to the rotating shaft component 2 during assembly.

[0036] Furthermore, a subtractive positioning hole 112 is formed axially through the rotor core 11 of the rotor assembly 1. Specifically, the subtractive positioning hole 112 is a circular hole that connects to the end face of the rotor core 11. The subtractive positioning hole 112 can be obtained by punching the silicon steel sheet of the rotor core 11. The rotor end cover member 14 of the rotor assembly 1 is stamped to form a positioning protrusion 141 on the inner side of the rotor end cover member 14. The positioning protrusion 141 of the rotor end cover member 14 is inserted into the subtractive positioning hole 112 of the rotor core 11. In this way, the weight of the rotor core 11 is reduced on the one hand, and the rotation direction of the rotor end cover member 14 can be positioned by using the subtractive positioning hole 112.

[0037] More specifically, the number of subtractive positioning holes 112 in the rotor core 11 is 0.5 times or 1 times the number of magnetic poles of the rotor assembly 1, so that the subtractive positioning holes 112 in the rotor core 11 are in a fixed ratio with the number of magnetic poles of the rotor assembly 1, so that the subtractive positioning holes 112 can be evenly distributed relative to the magnetic poles of the rotor assembly 1, and avoid affecting the electromagnetic performance of the rotor assembly 1.

[0038] Furthermore, an auxiliary hole 114 is formed axially through the rotor core 11. In this embodiment, the auxiliary hole 114 is an oblong hole with an arc and is connected to the end face of the rotor core 11. The auxiliary hole 114 can be obtained by punching the silicon steel sheet of the rotor core 11. The auxiliary hole 114 can be set to adapt to the electromagnetic performance of the rotor assembly 1.

[0039] Furthermore, the inner diameter of the subtractive positioning hole 112 of the rotor core 11 is larger than the outer diameter of the positioning protrusion 141 of the rotor end cover component 14; and the width of the auxiliary hole 114 of the rotor core 11 at its widest point is smaller than the outer diameter of the positioning protrusion 141 of the rotor end cover component 14. With this arrangement, it can be ensured that the positioning protrusion 141 of the rotor end cover component 14 will not be mistakenly stuck into the auxiliary hole 114 of the rotor core 11 during assembly, thus having a foolproof function.

[0040] Furthermore, after stamping the rotor end cover component 14 of the rotor assembly 1, a positioning groove 142 is formed on the outer side of the rotor end cover component 14 corresponding to the positioning protrusion 141. That is, the stamping process of the rotor end cover component 14 causes deformation, so that positioning grooves 142 and positioning protrusions 141 are formed on both sides of the rotor end cover component 14 respectively. The positioning groove 142 can cooperate with the protrusion to position the thrust washer, flange or other external components in the direction of rotation. The positioning protrusion 141 and positioning groove 142 can be formed on the rotor end cover component 14 simultaneously using the same stamping process, saving the process steps.

[0041] In this embodiment, the rotor end cover component 14 has four circumferentially distributed positioning protrusions 141 and positioning grooves 142. Correspondingly, the rotor core 11 also has four circumferentially distributed subtractive positioning holes 112. In addition, the rotor core 11 also has four circumferentially distributed auxiliary holes 114.

[0042] In this embodiment of the post-magnetized rotor mechanism, during manufacturing, the rotor core 11, rotor outer sleeve component 13, rotor end cover component 14, and several magnets 12 (in an unmagnetized state) of rotor assembly 1 are prefabricated, and the shaft component 2 is prefabricated. Using automatic assembly equipment or manually, the rotor core 11, rotor outer sleeve component 13, rotor end cover component 14, and several magnets 12 are assembled into rotor assembly 1, and the shaft component 2 is passed through the first shaft hole 113 of rotor core 11 and the second shaft hole 143 of rotor end cover component 14 to form an assembly of shaft component 2 and rotor assembly 1. Subsequently, the assembly of shaft component 2 and rotor assembly 1 is welded together by laser welding or welding. Finally, the rotor assembly 1 is magnetized to at least magnetize the magnets 12, thus completing the manufacturing of the post-magnetized rotor mechanism.

[0043] During the above process, the unmagnetized magnets 12 do not have magnetic attraction and are easy to insert into the magnet sockets 111 of the rotor core 11.

[0044] In the above process, since the positioning protrusion 141 protrudes relative to the end face of the rotor end cover component 14, if the positioning protrusion 141 of the rotor end cover component 14 fails to be engaged in the subtractive positioning hole 112 of the rotor core 11, there will be a large gap between the rotor end cover component 14 and the rotor core 11. Therefore, the positioning protrusion 141 also has the function of preventing mistake.

[0045] In the above process, since the number of the subtractive positioning holes 112 of the rotor core 11 is 0.5 times or 1 times the number of magnetic poles of the rotor assembly 1, the positioning groove 142 of the rotor end cover component 14 is also 0.5 times or 1 times the number of magnetic poles of the rotor assembly 1. When the positioning groove 142 of the rotor end cover component 14 forms a fixed angle with the magnetic poles of the rotor assembly 1, the positioning groove 142 of the rotor end cover component 14 can be used as an angle positioning reference at the magnetization station when the rotor assembly 1 is magnetized.

[0046] In this embodiment of the post-magnetized rotor mechanism, the magnets 12 are inserted into the magnet insertion holes 111 of the rotor core 11 before being magnetized. After assembly, the rotor assembly 1 is magnetized to at least magnetize the magnets 12. The unmagnetized magnets 12 significantly reduce assembly difficulty and facilitate automated operation, thereby effectively improving the assembly efficiency of the rotor mechanism. Since the magnetization process is carried out after assembly, the problem of incorrect magnetic pole direction is less likely to occur, ensuring the consistency and yield of the rotor mechanism. After magnetization, the electromagnetic performance of the entire post-magnetized rotor mechanism can be tested simultaneously. Compared to testing only the magnetism of the incoming material (i.e., the pre-magnetized magnets 12), testing the performance indicators of the entire post-magnetized rotor mechanism is more conducive to avoiding other factors affecting performance and test errors, thereby ensuring the performance consistency of the water pump assembly and enhancing the market competitiveness of electronic water pump products.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A post-magnetized rotor mechanism, characterized in that, Including rotor assembly; The rotor assembly includes a rotor core, a rotor outer sleeve component, a rotor end cover component, and a number of magnets. The rotor core has magnetic insertion holes corresponding to the number of magnetic steel sheets. When the magnetic steel sheets are not magnetized, they are respectively inserted into the magnetic insertion holes of the rotor core. The rotor core is provided with rotor end cap components at both ends, and the rotor outer sleeve component is fitted onto the rotor core and the rotor end cap components to fasten the rotor core and the rotor end cap components. After assembly, the rotor assembly is magnetized to at least magnetize the magnetic steel sheets.

2. The post-magnetized rotor mechanism according to claim 1, characterized in that, It also includes rotating shaft components; A first shaft hole is formed on the rotor core, and a second shaft hole is formed on the rotor end cover component; The rotating shaft component passes through the first shaft hole of the rotor core and the second shaft hole of the rotor end cover component, and is fixed to the rotor core and the rotor end cover component, respectively.

3. The post-magnetized rotor mechanism according to claim 1 or 2, characterized in that, The outer edge of the rotor end cover component is folded to form an outer flange, and the outer flange has a guide edge; The rotor end cover component is introduced into the inner ring of the rotor outer sleeve component through the guide edge of the outer flange, and the rotor end cover component is interference-fitted with the rotor outer sleeve component through the outer flange.

4. The post-magnetized rotor mechanism according to claim 2, characterized in that, The rotor end cover component is folded at the second shaft hole to form an inner flange; The inner flange of the rotor end cover component is clearance-fitted with the shaft component.

5. The post-magnetized rotor mechanism according to claim 1 or 2, characterized in that, The rotor assembly has a subtractive positioning hole that extends axially through the rotor core. The rotor end cover component of the rotor assembly is stamped to form a positioning protrusion on the inner side of the rotor end cover component; The positioning protrusion of the rotor end cover component is engaged in the subtractive positioning hole of the rotor core.

6. The post-magnetized rotor mechanism according to claim 5, characterized in that, The number of subtractive positioning holes in the rotor core is 0.5 times or 1 times the number of magnetic poles of the rotor assembly.

7. The post-magnetized rotor mechanism according to claim 5, characterized in that, An auxiliary hole is also formed at the rotor core, extending axially through it.

8. The post-magnetized rotor mechanism according to claim 6, characterized in that, The inner diameter of the subtractive positioning hole of the rotor core is larger than the outer diameter of the positioning protrusion of the rotor end cover component. Furthermore, the width of the auxiliary hole in the rotor core at its widest point is smaller than the outer diameter of the positioning protrusion of the rotor end cover component.

9. The post-magnetized rotor mechanism according to claim 5, characterized in that, After stamping the rotor end cover component of the rotor assembly, a positioning groove is formed on the outer side of the rotor end cover component corresponding to the positioning protrusion.

10. A water pump, characterized in that, Includes the post-magnetized rotor mechanism as described in any one of claims 1-9.

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