Stator core, stator core injection molding body, stator assembly and water pump using stator assembly

Abstract

The invention discloses a stator core, a stator core injection molding body, a stator assembly and a water pump using the same, and relates to the technical field of water pumps and parts thereof, the stator core comprises a plurality of stator steel sheet units stacked in the axial direction, and the inner ring surface of the stator core is configured to be a structure inclined to the axial direction. The invention mainly solves the problems of how to optimize a stator assembly in the prior art, so that a water pump obtains better electric energy-mechanical energy conversion efficiency and meets the requirements of miniaturization and light weight. The rotor-impeller structure, part of the outer wall of the liquid medium cavity and the stator assembly are roughly located on the same radial plane, the internal space utilization rate of the water pump is increased, the size and weight of the water pump are reduced, miniaturization and light weight of the water pump are achieved, and the water pump is suitable for the narrow position or the position with insufficient installation space; and the inner ring surface is configured to be the stator iron core inclined to the axial direction, so that the leakage flux is relatively low, and the electric energy-mechanical energy conversion efficiency of the water pump is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps and their components, and specifically to a stator core, an injection molded stator core, a stator assembly, and a water pump using the same. Background Art

[0002] A water pump can drive the flow of a liquid medium, enabling the liquid medium to flow directionally from one place to another. It is a mechanical device with a wide range of uses and is widely used in household appliances, automobiles, and industrial equipment. For example, liquid cooling radiators for computers, servers, and communication equipment, some models of air conditioners, washing machines, dishwashers, sanitary products, and floor cleaning robots are all equipped with water pumps to achieve functions such as liquid medium circulation, drainage, and water supply.

[0003] Whether it is a water pump directly driven by an entire motor module or a water pump using a wet rotor assembly (including an integrated rotor made of plastic magnetic material with an impeller), a stator assembly needs to be configured; under the drive of a drive circuit board, the stator assembly can generate a rotating magnetic field, which can magnetically couple and drive the rotor assembly to rotate, thereby driving the flow of the liquid medium, that is, realizing the basic function of the water pump.

[0004] In the existing stator assembly, its core is usually formed by stacking a number of silicon steel sheets, and the specifications of each silicon steel sheet are the same. Looking at the entire core along the axial direction, the inner diameter and outer diameter of each part are exactly the same. However, this structure of the core still has certain technical problems:

[0005] 1. Some water pumps are used in relatively narrow or space-constrained installation positions, which pose high requirements for the miniaturization and lightweight of the water pump. The above-mentioned core structure is not conducive to avoiding the installation of other components of the water pump (such as a spherical rotor assembly, bearings, a rotating shaft, a pump housing, and a drive circuit board).

[0006] 2. The above-mentioned core structure has a large leakage magnetic flux, which to a certain extent affects the overall electrical energy - mechanical energy conversion efficiency of the water pump / motor.

[0007] In summary, how to optimize the stator assembly in the existing technology to enable the water pump to obtain better electrical energy - mechanical energy conversion efficiency and meet the requirements of miniaturization and lightweight has become an urgent problem to be solved. Summary of the Invention

[0008] The purpose of the present invention is to provide a stator core, an injection molded stator core, a stator assembly, and a water pump using the same, which have better electrical energy - mechanical energy conversion efficiency and meet the requirements of miniaturization and lightweight.

[0009] To achieve the above object, the present invention provides the following technical solution: a stator core, which includes a plurality of stator steel sheet units stacked along the axial direction; the inner ring surface of the stator core is configured to be inclined to the axial direction.

[0010] In the above technical solution, each of the stator steel sheet units is composed of a plurality of stator steel sheets stacked along the axial direction, or each of the stator steel sheet units is composed of a single stator steel sheet.

[0011] In the above technical solution, each of the stator steel sheet units includes: a ring-shaped yoke portion, and a plurality of tooth portions formed on the inner side of the yoke portion and arranged in the circumferential direction; the free side end surface of the tooth portion is defined as the tooth portion end surface; after a plurality of the stator steel sheet units are stacked along the axial direction, the tooth portion end surfaces of each of the stator steel sheet units form a stepped structure, so that the inner ring surface of the stator core is configured to be inclined to the axial direction.

[0012] In the above technical solution, the serial numbers of each of the stator steel sheet units stacked along the axial direction are sequentially defined as 1, 2, 3, …, n - 1, n; and the extending lengths of the tooth portions of each of the stator steel sheet units stacked along the axial direction in the radial direction are sequentially defined as L 1 、L 2 、L 3 、…、L n―1 、L n , where 1, 2, 3, …, n - 1, n are the serial numbers of the stator steel sheet units; then: L 1 >L 2 >L 3 >…>L n―1 >L n .

[0013] In the above technical solution, the serial numbers of each of the stator steel sheet units stacked along the axial direction are sequentially defined as 1, 2, 3, …, n - 1, n; and the extending lengths of the tooth portions of each of the stator steel sheet units stacked along the axial direction in the radial direction are sequentially defined as L 1 、L 2 、L 3 、…、L n―1 、L n , where 1, 2, 3, …, n - 1, n are the serial numbers of the stator steel sheet units; then: L 1 ―L 2 =L 2 ―L 3 =…=L n―1 ―L n =a, where a is a constant.

[0014] A stator core injection molded body, which includes the above-mentioned stator core; it further includes a plastic-coated outer shell, and the plastic-coated outer shell is integrally formed on the surface of the stator core in a plastic coating manner; the formed stator core injection molded body includes: an annular stator yoke portion, and a plurality of stator tooth portions formed on the inner side of the stator yoke portion and arranged in the circumferential direction; the free side end surface of the stator tooth portion is configured as an inclined inner ring surface inclined to the axial direction.

[0015] A stator assembly, which includes the above-mentioned stator core injection molded body; it further includes stator coils respectively wound around each stator tooth portion of the stator core injection molded body, and terminals inserted and fixed at the plastic-coated outer shell of the stator core injection molded body and electrically connected to the stator coils.

[0016] A water pump, which includes the above-mentioned stator assembly; it further includes a rotor-impeller structure; the rotor-impeller structure includes a rotor portion and an impeller portion connected to the rotor portion; wherein, the outer side surface of the rotor portion is configured as a first arc surface; the water pump is provided with a liquid medium chamber, and at least a part of the inner wall of the liquid medium chamber is configured as an arc inner wall surface, so that the outer wall of the liquid medium chamber corresponding to the arc inner wall surface is configured as a second arc surface; the rotor-impeller structure is rotatably supported in the liquid medium chamber of the water pump; the stator assembly is fixed outside the liquid medium chamber of the water pump; the first arc surface of the rotor-impeller structure is aligned with the arc inner wall surface of the liquid medium chamber; the inclined inner ring surface of the stator assembly is aligned with the second arc surface of the liquid medium chamber.

[0017] In the above technical solution, the impeller portion of the rotor-impeller structure is formed with a plurality of impeller bodies arranged in the circumferential direction; each of the impeller bodies is configured as a fan-shaped structure, and a flow guiding groove is formed between two adjacent impeller bodies; and in each of the flow guiding grooves, a balance through hole penetrating the rotor portion is provided.

[0018] In the above technical solution, a support shaft with a ball bearing is arranged in the liquid medium chamber of the water pump; a ball bearing fitting is embedded in the rotor portion of the rotor-impeller structure; the ball bearing fitting of the rotor-impeller structure is matched with the ball bearing of the support shaft to rotatably support the rotor-impeller structure in the liquid medium chamber of the water pump.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The stator core of the present invention has an inner ring surface configured to be inclined with respect to the axial direction, which can avoid interfering with the installation of other components of the water pump (such as the rotor-impeller structure or the outer wall of the liquid medium chamber), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and achieving miniaturization and light weight of the water pump.

[0021] 2. The injection molded body of the stator core of the present invention has a free side end surface of the stator teeth configured as an inclined inner ring surface inclined with respect to the axial direction, which can avoid interfering with the installation of other components of the water pump (such as the rotor-impeller structure or the outer wall of the liquid medium chamber), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and achieving miniaturization and light weight of the water pump.

[0022] 3. The stator assembly of the present invention has a free side end surface of the stator teeth configured as an inclined inner ring surface inclined with respect to the axial direction, which can avoid interfering with the installation of other components of the water pump (such as the rotor-impeller structure or the outer wall of the liquid medium chamber), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and achieving miniaturization and light weight of the water pump; in addition, the stator core with an inner ring surface configured to be inclined with respect to the axial direction has a lower leakage magnetic flux, effectively improving the electrical energy-magnetic energy conversion efficiency of the stator assembly.

[0023] 4. In the water pump of the present invention, the first arc surface of the rotor-impeller structure is aligned with the arc-shaped inner wall surface of the liquid medium chamber; the inclined inner ring surface of the stator assembly is aligned with the second arc surface of the liquid medium chamber; in this way, the rotor-impeller structure, a part of the outer wall of the liquid medium chamber, and the stator assembly are substantially in the same radial plane in space without axial misalignment, effectively improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, achieving miniaturization and light weight of the water pump, and making the water pump suitable for relatively narrow or insufficient installation space positions; in addition, the stator core with an inner ring surface configured to be inclined with respect to the axial direction has a lower leakage magnetic flux, effectively improving the electrical energy-mechanical energy conversion efficiency of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional view of the stator core in the present invention.

[0025] Figure 2 It is an exploded structural view of the stator core in the present invention.

[0026] Figure 3 It is a sectional structural view of the stator core in the present invention.

[0027] Figure 4 It is a three-dimensional view of the injection molded body of the stator core in the present invention.

[0028] Figure 5 This is a cross-sectional structure view of the stator core injection molding body in the present invention.

[0029] Figure 6 This is a three-dimensional view of the stator assembly in the present invention.

[0030] Figure 7 This is a three-dimensional view of the water pump in the present invention.

[0031] Figure 8 This is an exploded structure view of the water pump in the present invention.

[0032] Figure 9 This is a cross-sectional structure view of the water pump in the present invention.

[0033] Figure 10 This is a three-dimensional view of the impeller in the present invention.

[0034] The reference numerals are: 10, stator core; 101, stator steel sheet unit; 101a, yoke portion; 101b, tooth portion; 101c, tooth portion end face; 102, inner ring surface; 20, stator core injection molding body; 201, plastic-coated shell; 202, stator yoke portion; 203, stator tooth portion; 203a, inclined inner ring surface; 30, stator assembly; 301, stator coil; 302, terminal; 40, liquid medium chamber; 401, second arc surface; 402, arc inner wall surface; 50, rotor-impeller structure; 501, rotor portion; 501a, first arc surface; 501b, balance through hole; 502, impeller portion; 502a, impeller body; 502b, guide groove; 503, ball bearing fitting; 60, support shaft; 601, ball bearing. Detailed Embodiment

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] This embodiment provides a stator core that can be applied in the stator assembly 30 and is used as the mechanical support foundation and magnetic conduction component of the stator assembly 30.

[0037] Please refer to Figures 1 - 3 , the stator core 10 of this embodiment includes a plurality of stator steel sheet units 101 stacked along the axial direction, and the inner ring surface 102 of the stator core 10 is configured to be inclined to the axial direction.

[0038] Specifically, each stator steel sheet unit 101 is composed of a plurality of stator steel sheets stacked in the axial direction, or each stator steel sheet unit 101 is composed of a single stator steel sheet; wherein, the stator steel sheet is specifically a silicon steel sheet (also known as "silicon steel sheet"). In this embodiment, each stator steel sheet unit 101 is composed of two stator steel sheets stacked in the axial direction. It can be understood that after the stator steel sheet units 101 are stacked in the axial direction, they can be fixed by adhesive bonding to form an integral structure (i.e., the stator core 10).

[0039] More specifically, each stator steel sheet unit 101 includes: an annular yoke portion 101a, and a plurality of tooth portions 101b formed on the inner side of the yoke portion 101a and arranged in the circumferential direction. That is, the tooth portions 101b and the yoke portion 101a are integrally formed structures; as Figures 1 - 3 shown, the free side end surface of the tooth portion 101b is defined as the tooth portion end surface 101c; after a plurality of stator steel sheet units 101 are stacked in the axial direction, the tooth portion end surfaces 101c of each stator steel sheet unit 101 form a stepped structure, so that the inner ring surface 102 of the stator core 10 is configured as a structure inclined to the axial direction.

[0040] As Figures 1 - 3 shown (please refer especially to Figure 3 ), more specifically, for each stator steel sheet unit 101 stacked in the axial direction, its serial numbers are sequentially defined as 1, 2, 3, …, n - 1, n; in this embodiment, the serial numbers of each stator steel sheet unit 101 increase from bottom to top in the axial direction, and a total of 5 stator steel sheet units 101 are provided in this embodiment; and for each stator steel sheet unit 101 stacked in the axial direction, the extension lengths of its tooth portions 101b in the radial direction are sequentially defined as L 1 、L 2 、L 3 、…、L n―1 、L n , where 1, 2, 3, …, n - 1, n are the serial numbers of the stator steel sheet units 101; then: L 1 >L 2 >L 3 >…>L n―1 >L n ; by setting in this way, the inner ring surface 102 of the stator core 10 can be configured as a structure inclined to the axial direction.

[0041] In some possible embodiments, for each stator steel sheet unit 101 stacked in the axial direction, its serial numbers are sequentially defined as 1, 2, 3, …, n - 1, n; and for each stator steel sheet unit 101 stacked in the axial direction, the extension lengths of its tooth portions 101b in the radial direction are sequentially defined as L1 , L 2 , L 3 , …, L n―1 , L n , where 1, 2, 3, …, n - 1, n are the serial numbers of the stator steel sheet units 101; then: L 1 ―L 2 = L 2 ―L 3 = … = L n―1 ―L n = a, where a is a constant, for example, a can be set to 1 mm, 2 mm, 0.5 mm, 1.5 mm, etc.; that is, in each stator steel sheet unit 101, the extension length L n of the tooth part 101b in the radial direction decreases from bottom to top along the axial direction, and the decreasing amount is the constant a.

[0042] Please refer to Figure 4 and Figure 5 , this embodiment also provides a stator core injection molded body 20, which includes the above-mentioned stator core 10.

[0043] The stator core injection molded body 20 of this embodiment further includes a plastic-coated outer shell 201, and the plastic-coated outer shell 201 is integrally formed on the surface of the stator core 10 in a plastic-coated manner.

[0044] When manufacturing the stator core injection molded body 20 of this embodiment, the stator core 10 is placed in the molding die of the plastic-coated outer shell 201, and plastic material is injected into the molding die. After the plastic material is cured and demolded, the plastic-coated outer shell 201 is integrally formed on the surface of the stator core 10 in a plastic-coated manner, so that the plastic-coated outer shell 201 and the stator core 10 form an integral structure (i.e., the stator core injection molded body 20).

[0045] The formed stator core injection molded body 20 includes: an annular stator yoke portion 202, and a plurality of stator tooth portions 203 formed on the inner side of the stator yoke portion 202 and arranged in the circumferential direction, that is, the stator tooth portions 203 and the stator yoke portion 202 are of an integral structure; since the inner ring surface 102 of the stator core 10 is configured as a structure inclined to the axial direction, the free side end surface of the stator tooth portion 203 is configured as an inclined inner ring surface 203a inclined to the axial direction.

[0046] By integrally forming the plastic-coated outer shell 201 on the surface of the stator core 10 in a plastic-coated manner, the stator core injection molded body 20 can be obtained without further configuring a housing for the stator core 10. On the one hand, the volume and weight of the stator core injection molded body 20 are effectively reduced, thereby reducing the overall volume and weight of the water pump. On the other hand, the assembly process of the housing is saved, thereby saving the overall assembly process of the water pump.

[0047] Please refer toFigure 6 , this embodiment further provides a stator assembly 30, which includes the above-mentioned injection-molded stator core 20.

[0048] The stator assembly 30 of this embodiment further includes stator coils 301 respectively wound around the stator teeth 203 of the injection-molded stator core 20, and terminals 302 inserted and fixed at the plastic-coated outer shell 201 of the injection-molded stator core 20 and electrically connected to the stator coils 301.

[0049] It should be noted that the terminal 302 can be inserted and fixed in the slot at the plastic-coated outer shell 201 of the injection-molded stator core 20 in an interference fit manner; alternatively, the terminal 302 (together with the stator core 10) can be placed in the molding die of the plastic-coated outer shell 201, and plastic material is injected into the molding die. After the plastic material is cured and demolded, a part of the terminal 302 is buried and fixed at the plastic-coated outer shell 201 of the injection-molded stator core 20.

[0050] It should be noted that the stator coil 301 is specifically a coil formed by winding an enameled wire around each stator tooth 203 of the injection-molded stator core 20 for a predetermined number of turns.

[0051] It should be noted that the end of the stator coil 301 is a bare wire, which is welded or hung on the terminal 302 to achieve the electrical connection between the terminal 302 and the stator coil 301.

[0052] This embodiment further provides a water pump, which can be applied to devices such as household appliances, automobiles, and industrial equipment (such as liquid cooling radiators of computers, servers, and communication equipment, some models of air conditioners, washing machines, dishwashers, bathroom products, and floor sweeping robots, etc.) to drive the flow of liquid media.

[0053] Please refer to Figures 7 - 10 , the water pump of this embodiment includes the above-mentioned stator assembly 30.

[0054] The water pump of this embodiment further includes a rotor-impeller structure 50.

[0055] In this embodiment, the rotor-impeller structure 50 is a single part made of plastic magnetic material, which has been magnetized and has permanent magnetism; in other embodiments, a permanent magnet can be embedded in the rotor-impeller structure 50 to make the rotor-impeller structure 50 have permanent magnetism.

[0056] The rotor - impeller structure 50 includes a rotor part 501 and an impeller part 502 connected to the rotor part 501. That is, the rotor part 501 and the impeller part 502 are of an integral structure. Among them, the outer side surface of the rotor part 501 is configured as a first arc surface 501a. In this way, the rotor part 501 is roughly hemispherical.

[0057] The water pump is provided with a liquid medium chamber 40. In this embodiment, the water pump has a housing, and the inner cavity of the housing is the liquid medium chamber 40. It can be understood that the water pump is respectively provided with a water inlet and a water outlet at the housing to communicate the inside and outside of the liquid medium chamber 40. At least a part of the inner wall of the liquid medium chamber 40 is configured as an arc inner wall surface 402, and the outer wall of the liquid medium chamber 40 corresponding to the arc inner wall surface 402 is configured as a second arc surface 401.

[0058] The rotor - impeller structure 50 is supported in the liquid medium chamber 40 of the water pump in a rotatable manner.

[0059] The stator assembly 30 is fixed outside the liquid medium chamber 40 of the water pump. Specifically, the stator assembly 30 can be fixed by means such as screw locking, snap - locking, and adhesive bonding.

[0060] Please especially refer to Figure 9 , in order to improve the internal space utilization rate of the water pump, reduce the volume and weight of the water pump, and realize the miniaturization and light - weight of the water pump, the first arc surface 501a of the rotor - impeller structure 50 is aligned with the arc inner wall surface 402 of the liquid medium chamber 40; the inclined inner ring surface 203a of the stator assembly 30 is aligned with the second arc surface 401 of the liquid medium chamber 40.

[0061] Please refer to Figures 8 - 10 , specifically, the impeller part 502 of the rotor - impeller structure 50 is formed with a plurality of impeller bodies 502a arranged in the circumferential direction. That is, the impeller bodies 502a are evenly arranged in the circumferential direction. Each impeller body 502a is configured as a fan - shaped structure, and a flow - guiding groove 502b is formed between two adjacent impeller bodies 502a. And, in each flow - guiding groove 502b, a balance through - hole 501b penetrating the rotor part 501 is provided.

[0062] Compared with the common arc - shaped blades in the prior art, the impeller body 502a arranged with the above - mentioned structure has less radial force, can effectively avoid the yaw of the rotor - impeller structure 50, and further avoid the friction between the rotor - impeller structure 50 and the inner wall of the liquid medium chamber 40.

[0063] Specifically, a support shaft 60 with a ball bearing 601 is arranged in the liquid medium chamber 40 of the water pump. In this embodiment, one end of the support shaft 60 is inserted and fixed at the bottom of the liquid medium chamber 40; a ball bearing fitting 503 is embedded in the rotor part 501 of the rotor-impeller structure 50. Specifically, the ball bearing fitting 503 is a graphite component with a hemispherical mating surface, and it is embedded in the rotor part 501 of the rotor-impeller structure 50 in an interference fit manner; the ball bearing fitting 503 of the rotor-impeller structure 50 cooperates with the ball bearing 601 of the support shaft 60 to support the rotor-impeller structure 50 in a rotatable manner in the liquid medium chamber 40 of the water pump. It can be understood that the entire rotor-impeller structure 50 is magnetically pulled by the stator assembly 30, so that the rotor-impeller structure 50 will not easily break away from the ball bearing 601.

[0064] With the above configuration, the rotor-impeller structure 50 realizes circumferential rotational support through the ball bearing 601 (instead of the traditional axial center limit), so as to obtain an open structure, making it easy for the liquid medium to enter and exit the space near the support shaft 60, the ball bearing 601, and the ball bearing fitting 503, thereby flushing away the impurities at the above positions. The impurities are not easy to accumulate at the above positions, effectively avoiding the problem of the rotor-impeller structure 50 being stuck.

[0065] When the water pump of this embodiment is in use, a specific current is passed through the stator coil 301 of the stator assembly 30 through the terminal 302 (specifically, it can be realized by a drive circuit board with a stator drive module (or a dedicated stator drive chip)), so that a rotating magnetic field is generated in the inner ring of the stator assembly 30. Through this rotating magnetic field, the rotor-impeller structure 50 can be magnetically coupled and driven to rotate in the liquid medium chamber 40 of the water pump; the liquid medium can flow in a directional manner under the drive of the rotor-impeller structure 50 (being sucked into the liquid medium chamber 40 of the water pump from the water inlet and being discharged from the water outlet at a certain pressure and flow rate), that is, the basic function of the water pump is realized.

[0066] The inner ring surface 102 of the stator core 10 of this embodiment is configured as a structure inclined to the axial direction, which can avoid installing other components of the water pump (such as the rotor-impeller structure 50 or the outer wall of the liquid medium chamber 40), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and light weight of the water pump.

[0067] For the stator core injection molded body 20 of this embodiment, the free side end surface of the stator teeth portion 203 is configured as an inclined inner ring surface 203a that is inclined with respect to the axial direction, which can avoid installing other components of the water pump (such as the rotor-impeller structure 50 or the outer wall of the liquid medium chamber 40), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and light weight of the water pump.

[0068] For the stator assembly 30 of this embodiment, the free side end surface of the stator teeth portion 203 is configured as an inclined inner ring surface 203a that is inclined with respect to the axial direction, which can avoid installing other components of the water pump (such as the rotor-impeller structure 50 or the outer wall of the liquid medium chamber 40), thereby improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and light weight of the water pump; in addition, the inner ring surface 102 of the stator core 10 configured to be inclined with respect to the axial direction has a lower leakage magnetic flux, effectively improving the electrical energy-magnetic energy conversion efficiency of the stator assembly 30.

[0069] For the water pump of this embodiment, the first arc surface 501a of the rotor-impeller structure 50 is aligned with the arc inner wall surface 402 of the liquid medium chamber 40; the inclined inner ring surface 203a of the stator assembly 30 is aligned with the second arc surface 401 of the liquid medium chamber 40; in this way, the rotor-impeller structure 50, a part of the outer wall of the liquid medium chamber 40, and the stator assembly 30 are substantially in the same radial plane in space without axial misalignment, effectively improving the utilization rate of the internal space of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and light weight of the water pump; in addition, the inner ring surface 102 of the stator core 10 configured to be inclined with respect to the axial direction has a lower leakage magnetic flux, effectively improving the electrical energy-mechanical energy conversion efficiency of the water pump.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stator core, characterized in that: It includes a plurality of stator steel sheet units stacked in the axial direction; The inner annular surface of the stator core is configured to be inclined with respect to the axial direction.

2. The stator core according to claim 1, characterized in that: Each of the stator steel sheet units is composed of a plurality of stator steel sheets stacked in the axial direction, or each of the stator steel sheet units is composed of a single stator steel sheet.

3. The stator core according to claim 1 or 2, characterized in that: Each of the stator steel sheet units comprises: A ring-shaped yoke, and a plurality of teeth formed on the inner side of the yoke and arranged in a circumferential direction; The free side end surface of the tooth portion is defined as the tooth portion end surface; After the stator steel sheet units are stacked in the axial direction, the tooth end faces of each stator steel sheet unit form a stepped structure, so that the inner annular surface of the stator core is configured as a structure inclined to the axial direction.

4. The stator core according to claim 3, characterized in that: The stator steel sheet units stacked in the axial direction are sequentially numbered as 1, 2, 3, ..., n-1, n; Furthermore, the extending lengths of the teeth of the stator steel sheet units stacked in the axial direction in the radial direction are defined as L1, L2, L3, ..., L n―1 , L n , wherein 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel sheet units; Then: L1>L2>L3>…>L n―1 >L n .

5. The stator core according to claim 3, characterized in that: The stator steel sheet units stacked in the axial direction are sequentially numbered as 1, 2, 3, ..., n-1, n; Furthermore, the extending lengths of the teeth of the stator steel sheet units stacked in the axial direction in the radial direction are defined as L1, L2, L3, ..., L n―1 , L n , wherein 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel sheet units; Then: L1-L2=L2-L3=…=L n―1 ―L n =a, where a is a constant.

6. A stator core injection molding body, characterized in that: Comprising the stator core according to any one of claims 1 to 5; It also includes a plastic-coated shell, which is integrally formed on the surface of the stator core in a plastic-coated manner; The molded stator core injection molding comprises: A stator yoke in an annular shape, and a plurality of stator teeth formed on the inner side of the stator yoke and arranged in a circumferential direction; The free side end surface of the stator tooth portion is configured as an inclined inner annular surface inclined with respect to the axial direction.

7. A stator assembly, characterized in that: The stator core injection molding body comprises the stator core injection molding body according to claim 6; It also includes stator coils respectively wound around the stator teeth of the stator core injection molding body, and terminals plugged and fixed on the overmolded shell of the stator core injection molding body and electrically connected to the stator coils.

8. A water pump, characterized in that: A stator assembly comprising the stator assembly of claim 7; It also includes a rotor-impeller structure; The rotor-impeller structure includes a rotor portion and an impeller portion interconnected with the rotor portion; wherein the outer side surface of the rotor portion is configured as a first arc surface; The water pump is provided with a liquid medium chamber, at least a portion of the inner wall of the liquid medium chamber is configured as an arc-shaped inner wall surface, so that the outer wall of the liquid medium chamber corresponding to the arc-shaped inner wall surface is configured as a second arc-shaped surface; The rotor-impeller structure is rotatably supported in the liquid medium chamber of the water pump; The stator assembly is fixed outside the liquid medium chamber of the water pump; The first arc surface of the rotor-impeller structure is aligned with the arc inner wall surface of the liquid medium chamber; the inclined inner ring surface of the stator assembly is aligned with the second arc surface of the liquid medium chamber.

9. The water pump according to claim 8, characterized in that The impeller portion of the rotor-impeller structure is formed with a plurality of impeller bodies arranged in a circumferential direction; Each of the impeller bodies is configured as a fan-shaped structure, and a guide groove is formed between two adjacent impeller bodies; Furthermore, each of the guide grooves is provided with a balancing through hole penetrating the rotor portion.

10. The water pump according to claim 8 or 9, characterized in that: A support shaft with a ball bearing is arranged in the liquid medium chamber of the water pump; A ball bearing fitting is embedded in the rotor portion of the rotor-impeller structure; The ball bearing fitting of the rotor-impeller structure cooperates with the ball bearing of the support shaft to rotatably support the rotor-impeller structure in the liquid medium chamber of the water pump.

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