Rotor and electronic water pump using same

Abstract

The utility model discloses a rotor and an electronic water pump using the same. The rotor comprises a rotating shaft; a rotor core; the sleeve is provided with a hollow inner cavity which penetrates through two axial ends of the sleeve and is used for accommodating the rotor core; the side end fixing assemblies are suitable for being symmetrically arranged at the two shaft side ends of the rotor iron core; each side end fixing assembly comprises an end plate connected with the shaft side end of the sleeve and an annular support arranged between the end plate and the rotor core and used for being connected with the shaft side end of the rotor core in a matched mode. Wherein an annular limiting cavity distributed along the circumferential direction of the rotor core is formed between each end plate and the opposite end surface of the rotor core; the balance mud is suitable for being attached to the shaft side end face of the rotor iron core and limited in the annular limiting cavity. According to the utility model, on one hand, the accuracy of the position where the balance mud is pasted is improved, on the other hand, the balance mud can be prevented from falling off, and meanwhile, the problem that the rotor is unbalanced and deviates due to the deviation of the position of the balance mud can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a rotor and an electronic water pump using the same. Background Technology

[0002] Electronic water pumps have a wide range of applications. For example, they can be used as core components in electric battery cooling water pumps in new energy vehicles. Given the limited installation space for electronic water pumps, the requirements for performance indicators such as flow rate and head are constantly increasing, forcing the motors using them to continuously increase their speed. The increase in motor speed places higher demands on the smoothness of rotor operation (the dynamic balance level of the brushless DC motor rotor is key to affecting the noise level during rated operation). Therefore, requirements are placed on the unbalance of the motor rotor (because the smaller the rotor unbalance, the smoother the rotor operation; the smoother the rotor operation, the higher the control precision of the controller, thus reducing the vibration and noise of the water pump and motor).

[0003] Specifically, in rotor structures with surface-mounted magnets, when applying dynamic balancing mud to the rotor, the mud is usually applied between two adjacent magnets or inside the weight-reducing holes in the rotor core. However, since the middle position between adjacent magnets and the weight-reducing holes in the rotor do not extend through the entire circumference, not only is the mud application difficult, but it can also cause the rotor imbalance position to shift or the balancing mud to fall off, affecting the dynamic balancing effect and consequently affecting the vibration, noise, and service life of the electric water pump.

[0004] Furthermore, for example, a brushless electronic water pump rotor disclosed in CN112787441A includes two metal end plates located near both ends of the rotor core. Based on this structure, a small amount of machining is performed on the outer surface of the metal end plates away from the rotor core to create multiple blind holes for facilitating the dynamic balancing of the rotor. However, this design of multiple blind holes also cannot penetrate the circumferential direction, thus similarly causing the rotor's unbalanced position to shift and affecting the effectiveness of dynamic balancing.

[0005] Therefore, to address the issue of unsatisfactory dynamic balance adjustment in existing rotor technologies, further improvements to the rotor structure are needed. Utility Model Content

[0006] The primary objective of this invention is to provide a rotor that solves the technical problem of optimizing its dynamic balance adjustment effect.

[0007] The second objective of this invention is to provide an electronic water pump to solve the technical problem of optimizing its dynamic balance adjustment effect.

[0008] The rotor of this invention is implemented as follows:

[0009] A rotor comprising:

[0010] Shaft;

[0011] Rotor core;

[0012] A sleeve having a hollow inner cavity extending through its axial ends to accommodate a rotor core;

[0013] A pair of side-end fixing assemblies are adapted to be symmetrically disposed on two axial ends of a rotor core; each side-end fixing assembly includes an end plate connected to the axial end of a sleeve, and an annular bracket disposed between the end plate and the rotor core for engaging with the axial end of the rotor core; wherein an annular limiting cavity is formed between the end faces of each end plate and the opposite end faces of the rotor core, distributed along the circumferential direction of the rotor core.

[0014] Balance mud, which is suitable for being attached to the axial end face of the rotor core and confined in an annular limiting cavity.

[0015] In optional embodiments of this utility model, the annular bracket includes an annular body and a plurality of positioning pieces spaced apart on one side of the outer circumferential edge of the annular body.

[0016] Each of the aforementioned positioning pieces is bent relative to the annular body; and

[0017] The rotor core includes a core body and a plurality of magnets spaced apart along the circumferential direction and attached to the outer side wall of the core body.

[0018] Each positioning piece is adapted to be embedded in the gap formed by two adjacent magnets.

[0019] In an optional embodiment of this utility model, when the annular bracket and the rotor core are assembled in place, the outer circumferential surface of the annular body is coplanar with the outer circumferential surface formed by the enclosing of multiple magnets; and the outer side wall of each positioning piece facing away from the axis of the core body will not protrude from the outer circumferential surface formed by the enclosing of multiple magnets.

[0020] In an optional embodiment of this utility model, the outer wall surface of each positioning piece facing away from the axis of the iron core body is an L-shaped stepped surface. The L-shaped stepped surface includes a high surface that is coplanar with the outer circumferential surface formed by the enclosing of multiple magnets and a low surface that is concave relative to the outer circumferential surface formed by the enclosing of multiple magnets.

[0021] In an optional embodiment of this utility model, the rotor core is provided with a plurality of weight-reducing holes distributed circumferentially and extending to the axial end of the rotor core; and

[0022] One of the side walls of the annular limiting cavity is formed between the inner circumferential edge of the annular body and the outer circumferential edge of the multiple weight-reducing holes away from the axis of the rotor core.

[0023] In an optional embodiment of this utility model, the end plate includes a plate-shaped body with a central through hole suitable for the shaft to pass through, and an annular protrusion formed in a raised shape on the side of the plate-shaped body facing away from the rotor core.

[0024] The annular protrusion has a hollow cavity to cooperate with the rotor core to form the annular limiting cavity.

[0025] In an optional embodiment of this utility model, the portion of the plate-shaped body located outside the annular protrusion is adapted to be attached to the annular body, and the portion of the plate-shaped body located inside the annular protrusion is adapted to be attached to the rotor core.

[0026] In an optional embodiment of this utility model, the outer circumferential edge of the plate-shaped body is provided with an annular extension plate bent away from the rotor core.

[0027] The annular extension plate is adapted to be welded to the inner wall of the sleeve.

[0028] In an optional embodiment of this utility model, the edge of the central through hole is provided with an annular extension wall bent away from the rotor core.

[0029] The annular extension wall is adapted to be welded to the outer wall of the rotating shaft.

[0030] The electronic water pump of this invention is implemented as follows:

[0031] An electronic water pump includes: the rotor.

[0032] By adopting the above technical solution, this utility model has the following beneficial effects: The rotor of this utility model and the electronic water pump using it limit the balancing mud by forming annular limiting cavities distributed along the circumference of the rotor core between the end plates and the opposite end faces of the rotor core. On the one hand, this improves the accuracy of the balancing mud placement position, and on the other hand, it can prevent the balancing mud from falling off. It can also prevent the rotor from becoming unbalanced and shifting due to the displacement of the balancing mud position. This reduces the noise during the use of the electronic water pump and extends the service life of the electronic water pump. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the rotor of this utility model;

[0034] Figure 2 This is an exploded structural diagram of the rotor of this utility model;

[0035] Figure 3 This is a cross-sectional view of the rotor of this utility model;

[0036] Figure 4 This is a first-view structural schematic diagram of the end plate of the rotor of this utility model.

[0037] Figure 5 This is a second-view structural schematic diagram of the end plate of the rotor of this utility model.

[0038] Figure 6 This is a schematic diagram of the annular support structure of the rotor of this utility model;

[0039] Figure 7 This is a first-view schematic diagram of the cooperation structure between the annular support of the rotor and the rotor core of this utility model.

[0040] Figure 8 This is a second-view schematic diagram of the cooperation structure between the annular support of the rotor and the rotor core of this utility model.

[0041] In the figure: 1. Rotating shaft; 21. Iron core body; 22. Magnet; 23. Gap; 24. Weight reduction hole; 3. Sleeve; 4. End plate; 41. Plate-shaped body; 42. Annular protrusion; 43. Annular limiting cavity; 44. Annular extension plate; 45. Annular extension wall; 46. Central through hole; 5. Annular bracket; 51. Circular body; 52. Positioning piece; 521. High surface; 522. Low surface. Detailed Implementation

[0042] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0043] Example 1:

[0044] Please see Figures 1 to 8 As shown, this embodiment provides a rotor, including: a rotating shaft 1, a rotor core, a sleeve 3, and a balancing mud for use.

[0045] Specifically, the first component is the rotor core, which can be any mature technology in the prior art. This embodiment does not modify the overall structure of the rotor core, which generally includes a core body 21 and a plurality of magnets 22 spaced apart along the circumferential direction and attached to the outer wall of the core body 21. Furthermore, the core body 21 has a plurality of weight-reducing holes 24 distributed along the circumferential direction and extending to the axial end of the rotor core.

[0046] Secondly, there is sleeve 3, which has a hollow inner cavity extending through both axial ends to accommodate the rotor core. Regarding the material of sleeve 3, stainless steel can be selected for its stable performance.

[0047] Furthermore, a pair of side-end fixing assemblies are adapted to be symmetrically disposed on the two axial ends of the rotor core; each side-end fixing assembly includes an end plate 4 connected to the axial end of the sleeve 3, and an annular bracket 5 disposed between the end plate 4 and the rotor core for engaging with the axial end of the rotor core. An annular limiting cavity 43 is formed between the end faces of each end plate 4 and the opposite end face of the rotor core, distributed along the circumference of the rotor core. The annular limiting cavity 43 here is mainly used to accommodate the balancing mud.

[0048] Regarding the balancing paste, it is suitable for being applied to the axial end face of the iron core body 21 and confined within the annular limiting cavity 43. The design of the annular limiting cavity 43 improves the efficiency of the balancing paste application process and prevents the balancing paste from falling off. Furthermore, the annular limiting cavity 43, distributed along the circumference of the rotor iron core, prevents the balancing paste from shifting position and causing rotor imbalance.

[0049] Referring to the accompanying drawings, in one optional embodiment, the specific annular bracket 5 includes an annular body 51 and a plurality of spaced positioning pieces 52 disposed on one side of the outer circumferential edge of the annular body 51; the plurality of positioning pieces 52 are all bent relative to the annular body 51.

[0050] Each positioning piece 52 is adapted to be embedded in the gap formed by two adjacent magnets 22. In this structure, the fit between the positioning piece 52 and the gap of the adjacent magnet 22 can play a role in fixing the support, thus ensuring that the annular support 5 will not fall off when the rotor is dynamically balanced.

[0051] Specifically, referring to the accompanying drawings, the end plate 4 used in this embodiment includes a plate-shaped body 41 with a central through hole suitable for the shaft 1 to pass through, and an annular protrusion 42 formed in a raised shape on the side of the plate-shaped body 41 facing away from the rotor core; the annular protrusion 42 has a hollow cavity to cooperate with the rotor core to form an annular limiting cavity 43. The design of the annular limiting cavity 43 here ensures that the balancing mud attached to the core body 21 can be completely contained in the annular limiting cavity 43, ensuring that the position of the balancing mud does not change.

[0052] Referring to the accompanying drawings, the end plate 4 used in this embodiment includes a plate-shaped body 41 with a central through hole 46 suitable for the shaft 1 to pass through, and an annular protrusion 42 formed in a raised shape on the side of the plate-shaped body 41 facing away from the rotor core; the annular protrusion 42 has a hollow cavity to cooperate with the rotor core to form an annular limiting cavity 43. The design of the annular limiting cavity 43 here ensures that the balancing mud attached to the rotor core can be completely contained in the annular limiting cavity 43, ensuring that the position of the balancing mud does not change. More specifically, the portion of the plate-shaped body 41 located outside the annular protrusion 42 is adapted to fit onto the annular body 51, and the portion of the plate-shaped body 41 located inside the annular protrusion 42 is adapted to fit onto the core body 21. This means that, for the plate-shaped body 41, apart from the annular protrusion 42, the end faces of the other parts facing the core body 51 are not on the same horizontal plane, but rather exist on two staggered horizontal planes. Because the annular body 51 has a certain thickness, the plate-shaped body 41 is designed so that it can fit onto both the annular body 51 and the core body 21 respectively, allowing the annular limiting cavity 43 to form a closed cavity. This ensures that the balancing mud attached to the core body 21 can be confined into the annular limiting cavity 43. Furthermore, for the portion confined to the annular... Regarding the balancing mud in the limiting cavity 43, along the radial dimension of the iron core body 21, the outer diameter surface of the balancing mud is limited by the annular body 51, while the inner diameter surface of the balancing mud is limited by the cavity wall of the hollow cavity of the annular protrusion 42. As for the axial dimension along the iron core body 21, the axial height of the annular protrusion 42 in this embodiment is designed in combination with the height range of rotor iron core attachment in the prior art. This allows the axial thickness of the balancing mud attached to the iron core body 21 to enter the annular limiting cavity 43. The axial direction of the annular limiting cavity 43 limits the axial direction of the balancing mud, thereby ensuring that the radial and axial directions of the balancing mud attached to the iron core body 21 are reliably limited, ensuring that the balancing mud will not fall off unexpectedly or shift in position during long-term use of the rotor.

[0053] Furthermore, it is necessary to explain the cooperation method between the end plate 4, the rotating shaft 1, and the sleeve 3 in this embodiment, as illustrated in the accompanying drawings:

[0054] The outer circumferential edge of the plate-shaped body 41 is provided with an annular extension plate 44 bent away from the rotor core; the annular extension plate 44 is adapted to be welded to the inner wall of the sleeve 3. The edge of the central through hole 46 is provided with an annular extension wall 45 bent away from the rotor core; the annular extension wall 45 is adapted to be welded to the outer wall of the shaft 1. Here, by welding, a sealed space is formed inside the sleeve 3 through the cooperation of a pair of end plates 4, sleeve 3, and shaft 1, thus protecting the rotor core and preventing the problem of coolant corrosion of the rotor core when the rotor of this embodiment is used, for example, in an electric water pump. In addition, the design of the annular extension plate 44 in this embodiment can increase the contact area between it and the inner wall of the sleeve 3, thereby strengthening the welding effect. Similarly, the design of the annular extension wall 45 can increase the contact area between it and the outer wall of the shaft 1, thereby strengthening the welding effect.

[0055] Based on the above, it should be further explained that when the annular bracket 5 is assembled with the rotor core, the outer circumferential surface of the annular body 51 is coplanar with the outer circumferential surface formed by the multiple magnets 22, and the inner circumferential surface of the annular body 51 will not enter the annular limiting cavity 43. It should be noted that one side wall of the annular limiting cavity 43 is formed between the inner circumferential edge of the annular body 51 and the outer circumferential edge of the multiple weight-reducing holes 24 away from the axis of the rotor core. This design means that the design of the annular bracket 5 will not affect the application of the balancing mud. In detail with the attached drawings, if the radius of the outer circumferential edge of the weight-reducing hole 24 is D1, and the radius of the inner circumferential edge of the annular body 51 is D2, then the radius of the area corresponding to the annular limiting cavity 43 on the core body 21 is between D2 and D1. Within this area, the core body 21 does not have weight-reducing holes 24 or other blind holes or through holes, thus improving the accuracy of the balancing mud application position.

[0056] Furthermore, it should be noted that the outer wall surface of each positioning piece 52 facing away from the axis of the iron core body 21 does not protrude from the outer circumferential surface formed by the multiple magnets 22. The significance of this design is that when the rotor iron core and the sleeve 3 are assembled in place, the outer circumferential surface formed by the multiple magnets 22 is in contact with the inner wall of the sleeve 3. Therefore, if the outer wall surface of the positioning piece 52 facing away from the axis of the iron core body 21 protrudes from the outer circumferential surface formed by the multiple magnets 22, the positioning piece 52 cannot smoothly enter the hollow inner cavity of the sleeve 3.

[0057] Based on the above structure, and referring to the accompanying drawings, an optional scenario is illustrated: the outer wall surface of each positioning piece 52 facing away from the axis of the iron core body 21 is an L-shaped stepped surface. This L-shaped stepped surface includes a high surface 521 coplanar with the outer circumferential surface formed by the multiple magnets 22 and a low surface 522 that is concave relative to the outer circumferential surface formed by the multiple magnets 22. More specifically, the high surface 521 is directly connected to the annular body 51, while the low surface is located on the side of the high surface 521 facing away from the annular body 51. In this design, during the process of assembling the rotor iron core and the annular support 5 into the sleeve 3, the low surface 522 of the positioning piece 52 facilitates the entry of the annular support 5 into the sleeve 3. Furthermore, the contact and cooperation between the high surface 521 and the inner wall of the sleeve 3 further enhances the support force for the annular support 5 from the inside, thereby strengthening the welding effect between the end plate 4 and the sleeve 3. If the gap 23 formed between the adjacent magnets 22 cannot provide internal support for the sleeve 3, it may result in an unreliable weld between the end plate 4 and the sleeve 3.

[0058] In summary, for the rotor of this embodiment, not only is the operation of applying balancing mud to the rotor core more convenient, but the reliability and stability of the applied balancing mud's position on the rotor core are also improved, avoiding unexpected detachment and positional displacement. Furthermore, the design of the annular bracket 5 improves the robustness of the welded structure formed by the sleeve 3 and the end cap 4. Additionally, the high temperature generated at the weld point during welding of the sleeve 3 and the end cap 4 is isolated from heat transfer between the weld point and the magnet 22 by the annular bracket 5, thus protecting the magnet 22.

[0059] Example 2:

[0060] Based on the rotor of Embodiment 1, this embodiment provides an electronic water pump, including: the rotor of Embodiment 1.

[0061] For the electronic water pump of this embodiment, by improving the reliability and stability of the position of the applied balancing mud on the rotor core, the service life of the electronic water pump using this rotor is extended, while reducing vibration and noise during the use of the electronic water pump.

[0062] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0063] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0066] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0067] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A rotor, characterized in that, include: Shaft; Rotor core; A sleeve having a hollow inner cavity extending through its axial ends to accommodate a rotor core; A pair of side-end fixing assemblies are adapted to be symmetrically disposed on two axial ends of a rotor core; each side-end fixing assembly includes an end plate connected to the axial end of a sleeve, and an annular bracket disposed between the end plate and the rotor core for engaging with the axial end of the rotor core; wherein an annular limiting cavity is formed between the end faces of each end plate and the opposite end faces of the rotor core, distributed along the circumferential direction of the rotor core. Balance mud, which is suitable for being attached to the axial end face of the rotor core and confined in an annular limiting cavity.

2. The rotor according to claim 1, characterized in that, Each of the ring-shaped supports includes a circular body and a plurality of spaced positioning pieces disposed on one side of the outer circumferential edge of the circular body. Each of the aforementioned positioning pieces is bent relative to the annular body; and The rotor core includes a core body and a plurality of magnets spaced apart along the circumferential direction and attached to the outer side wall of the core body. Each positioning piece is adapted to be embedded in the gap formed by two adjacent magnets.

3. The rotor according to claim 2, characterized in that, When the annular bracket and the rotor core are assembled in place, the outer circumferential surface of the annular body is coplanar with the outer circumferential surface formed by the enclosing of multiple magnets; and the outer side wall of each positioning piece facing away from the axis of the core body will not protrude from the outer circumferential surface formed by the enclosing of multiple magnets.

4. The rotor according to claim 3, characterized in that, The outer wall surface of each positioning piece facing away from the axis of the iron core body is an L-shaped stepped surface, which includes a high surface that is coplanar with the outer circumferential surface formed by the enclosing of multiple magnets and a low surface that is concave relative to the outer circumferential surface formed by the enclosing of multiple magnets.

5. The rotor according to any one of claims 2 to 4, characterized in that, The rotor core is provided with a plurality of weight-reducing holes distributed circumferentially and extending to the axial ends of the rotor core; and One of the side walls of the annular limiting cavity is formed between the inner circumferential edge of the annular body and the outer circumferential edge of the multiple weight-reducing holes away from the axis of the rotor core.

6. The rotor according to claim 5, characterized in that, The end plate includes a plate-shaped body with a central through hole suitable for the shaft to pass through, and an annular protrusion formed in a raised shape on the side of the plate-shaped body facing away from the rotor core. The annular protrusion has a hollow cavity to cooperate with the rotor core to form the annular limiting cavity.

7. The rotor according to claim 6, characterized in that, The portion of the plate-shaped body located outside the annular protrusion is adapted to be attached to the annular body, and the portion of the plate-shaped body located inside the annular protrusion is adapted to be attached to the rotor core.

8. The rotor according to claim 6, characterized in that, The outer circumferential edge of the plate-shaped body is provided with an annular extension plate bent away from the rotor core. The annular extension plate is adapted to be welded to the inner wall of the sleeve.

9. The rotor according to claim 6, characterized in that, The edge of the central through hole is provided with an annular extension wall that bends away from the rotor core. The annular extension wall is adapted to be welded to the outer wall of the rotating shaft.

10. An electronic water pump, characterized in that, include: The rotor as described in any one of claims 1 to 9.

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