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

Abstract

The utility model discloses a stator iron core, a stator iron core injection molding body, a stator assembly and a water pump using the same, the stator iron core comprises a plurality of stator steel sheet units stacked along the axial direction, and the inner ring surface of the stator iron core is configured to be a structure inclined to the axial direction. The utility model 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 structural body, 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] This utility model relates to the technical field of water pumps and their components, specifically a stator core, a stator core injection molded body, a stator assembly, and a water pump using the same. Background Technology

[0002] A water pump is a versatile mechanical device that drives the flow of liquid media, allowing the liquid media to flow directionally from one place to another. It 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, bathroom products, and robot vacuum cleaners are all equipped with water pumps to achieve functions such as liquid media circulation, drainage, and water supply.

[0003] Whether it is a water pump directly driven by the entire motor module or a water pump using a wet rotor assembly (including an integrated rotor with an impeller made of plastic magnetic material), a stator assembly is required. Under the drive of the 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, thus realizing the basic function of the water pump.

[0004] In existing stator assemblies, the core is typically composed of stacked silicon steel sheets, all of which have the same specifications. This ensures that the inner and outer diameters of all parts of the core are identical when viewed axially. However, this core structure still presents certain technical challenges.

[0005] 1. Some water pumps are used in relatively narrow or space-constrained locations, which places high demands on the miniaturization and weight reduction of the water pump. The iron core structure described above is not conducive to the installation of other water pump components (such as spherical rotor assembly, bearings, shaft, pump casing, and drive circuit board).

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

[0007] In summary, optimizing the stator components in existing technologies to achieve better electro-mechanical energy conversion efficiency for water pumps, while meeting the requirements of miniaturization and weight reduction, has become an urgent problem to be solved. Utility Model Content

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

[0009] To achieve the above objectives, the present invention provides the following technical solution: a stator core comprising 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 in the axial direction.

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

[0011] In the above technical solution, each stator steel sheet unit includes: an annular yoke, and a plurality of teeth formed on the inner side of the yoke and arranged in the circumferential direction; the free side end face of the teeth is defined as the tooth end face; after the plurality of stator steel sheet units are stacked in the axial direction, the tooth end face of each stator steel sheet unit forms a stepped structure, thereby making the inner annular surface of the stator core inclined in the axial direction.

[0012] In the above technical solution, the stator steel laminations stacked along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; and the radial extension length of the teeth of each stator steel lamination stacked along the axial direction is sequentially defined as L1, L2, L3, ..., L... n―1 L n Where 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel lamination units; then: L1>L2>L3>...>L n―1 >L n .

[0013] In the above technical solution, the stator steel laminations stacked along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; and the radial extension length of the teeth of each stator steel lamination stacked along the axial direction is sequentially defined as L1, L2, L3, ..., L... n―1 L n Where 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel lamination units; then: L1―L2=L2―L3=…=L n―1 ―L n = a, where a is a constant.

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

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

[0016] A water pump includes the stator assembly described above; 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 surface of the rotor portion is configured as a first arcuate 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 arcuate inner wall surface, such that the outer wall of the liquid medium chamber corresponding to the arcuate inner wall surface is configured as a second arcuate surface; the rotor-impeller structure is rotatably supported within the liquid medium chamber of the water pump; the stator assembly is fixed outside the liquid medium chamber of the water pump; the first arcuate surface of the rotor-impeller structure is aligned with the arcuate inner wall surface of the liquid medium chamber; the inclined inner annular surface of the stator assembly is aligned with the second arcuate surface of the liquid medium chamber.

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

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

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The stator core of this utility model has an inner ring surface that is configured to be inclined in the axial direction, which can avoid 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 internal space utilization of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and weight reduction of the water pump.

[0021] 2. The stator core injection molded body of this utility model has a stator tooth free side end face configured as an inclined inner ring surface in the axial direction, which can avoid the installation of other parts of the water pump (such as rotor-impeller structure or outer wall of liquid medium chamber), thereby improving the internal space utilization of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and weight reduction of the water pump.

[0022] 3. The stator assembly of this utility model has a stator tooth free side end face configured as an inclined inner ring surface in the axial direction, which can avoid 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 internal space utilization of the water pump, reducing the size and weight of the water pump, and realizing the miniaturization and weight reduction of the water pump; in addition, the inner ring surface is configured as a stator core in the axial direction, which has a low leakage flux and effectively improves the electrical energy to magnetic energy conversion efficiency of the stator assembly.

[0023] 4. In this utility model, the first arc-shaped surface of the rotor-impeller structure is aligned with the arc-shaped inner wall of the liquid medium chamber; the inclined inner ring surface of the stator assembly is aligned with the second arc-shaped surface of the liquid medium chamber. In this way, the rotor-impeller structure, part of the outer wall of the liquid medium chamber, and the stator assembly are approximately in the same radial plane in space without axial misalignment, which effectively improves the internal space utilization of the water pump, reduces the size and weight of the water pump, and realizes the miniaturization and weight reduction of the water pump, making the water pump suitable for narrow or space-constrained locations. In addition, the inner ring surface is configured as a stator core inclined to the axial direction, which has a low leakage flux and effectively improves the electrical energy to mechanical energy conversion efficiency of the water pump. Attached Figure Description

[0024] Figure 1 This is a perspective view of the stator core in this utility model.

[0025] Figure 2 This is an exploded structural view of the stator core in this utility model.

[0026] Figure 3 This is a cross-sectional view of the stator core in this utility model.

[0027] Figure 4 This is a perspective view of the stator core injection molded body in this utility model.

[0028] Figure 5 This is a cross-sectional view of the stator core injection molded body in this utility model.

[0029] Figure 6 This is a perspective view of the stator assembly in this utility model.

[0030] Figure 7 This is a perspective view of the water pump in this utility model.

[0031] Figure 8 This is an exploded structural view of the water pump in this utility model.

[0032] Figure 9 This is a cross-sectional view of the water pump in this utility model.

[0033] Figure 10 This is a perspective view of the impeller in this utility model.

[0034] The reference numerals in the attached figures are as follows: 10, stator core; 101, stator lamination unit; 101a, yoke; 101b, tooth; 101c, tooth end face; 102, inner annular surface; 20, stator core injection molded body; 201, plastic-coated outer shell; 202, stator yoke; 203, stator tooth; 203a, oblique inner annular surface; 30, stator assembly; 301, stator coil; 302, terminal; 40, liquid medium chamber; 401, second arc-shaped surface; 402, arc-shaped inner wall surface; 50, rotor-impeller structure; 501, rotor section; 501a, first arc-shaped surface; 501b, balance through hole; 502, impeller section; 502a, impeller body; 502b, guide groove; 503, ball bearing mating part; 60, support shaft; 601, ball bearing. Detailed Implementation

[0035] 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.

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

[0037] Please see 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 several stator steel sheets stacked along 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 along the axial direction. It can be understood that after the stator steel sheet units 101 are stacked along the axial direction, they can be fixed by adhesive bonding to form an integral structure (i.e., stator core 10).

[0039] More specifically, each stator steel sheet unit 101 includes: an annular yoke 101a, and a plurality of teeth 101b formed on the inner side of the yoke 101a and arranged in the circumferential direction, that is, the teeth 101b and the yoke 101a are integrally formed; such as Figures 1-3 As shown, the free side end face of the tooth 101b is defined as the tooth end face 101c; after several stator steel sheet units 101 are stacked along the axial direction, the tooth end face 101c of each stator steel sheet unit 101 forms a stepped structure, thereby making the inner ring surface 102 of the stator core 10 configured to be inclined to the axial direction.

[0040] like Figures 1-3 As shown (please refer to in particular) Figure 3 More specifically, the stator lamination units 101 stacked along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; in this embodiment, the number of each stator lamination unit 101 increases from bottom to top along the axial direction, and a total of 5 stator lamination units 101 are provided in this embodiment; furthermore, the radial extension length of the teeth 101b of each stator lamination unit 101 stacked along the axial direction is sequentially defined as L1, L2, L3, ..., L... n―1 L n Where 1, 2, 3, ..., n-1, n are the serial numbers of stator steel sheet unit 101; then: L1>L2>L3>...>L n―1 >L n By setting it in this way, the inner ring surface 102 of the stator core 10 can be configured to be inclined in the axial direction.

[0041] In some possible embodiments, the stator lamination units 101 stacked along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; and the radial extension length of the teeth 101b of each stator lamination unit 101 stacked along the axial direction is sequentially defined as L1, L2, L3, ..., L... n―1 L nWhere 1, 2, 3, ..., n-1, n are the serial numbers of stator steel sheet unit 101; then: L1―L2=L2―L3=…=L n―1 ―L n =a, where a is a constant, for example, a can be set to 1mm, 2mm, 0.5mm, and 1.5mm, etc.; that is, in each stator steel lamination unit 101, the radial extension length L of its tooth portion 101b is... n It decreases from bottom to top along the axial direction, and the decrease is a constant a.

[0042] Please see Figure 4 and Figure 5 This embodiment also provides a stator core injection molded body 20, which includes the stator core 10 described above.

[0043] The stator core injection molding body 20 in this embodiment also includes a plastic-coated shell 201, which is integrally formed on the surface of the stator core 10 in a plastic coating manner.

[0044] In this embodiment, the stator core injection molding body 20 is manufactured by placing the stator core 10 in the molding mold of the plastic-coated outer shell 201, injecting plastic material into the molding mold, and after the plastic material has cured and been demolded, the plastic-coated outer shell 201 is integrally molded on the surface of the stator core 10 in a plastic coating manner, so that the plastic-coated outer shell 201 and the stator core 10 form an integral structure (i.e., the stator core injection molding body 20).

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

[0046] By using plastic coating, a plastic-coated outer shell 201 is integrally formed on the surface of the stator core 10 to obtain the stator core injection molded body 20, thus eliminating the need to configure an outer shell for the stator core 10. On the one hand, this effectively reduces the volume and weight of the stator core injection molded body 20, thereby reducing the overall volume and weight of the water pump. On the other hand, it saves the assembly process of the outer shell, thereby saving the overall assembly process of the water pump.

[0047] Please see Figure 6 This embodiment also provides a stator assembly 30, which includes the stator core injection molded body 20 described above.

[0048] The stator assembly 30 of this embodiment also includes stator coils 301 wound on each stator tooth 203 of the stator core injection molded body 20, and terminals 302 that are plugged into and fixed to the plastic-coated shell 201 of the stator core injection molded body 20 and electrically connected to the stator coils 301.

[0049] It should be noted that the terminal 302 can be fixed in the slot of the plastic-coated outer shell 201 of the stator core injection molding body 20 by plugging in (plugging in and fixing in an interference fit); or the terminal 302 (together with the stator core 10) can be placed in the molding mold of the plastic-coated outer shell 201, plastic material can be injected into the molding mold, and after the plastic material has cured and been demolded, a part of the terminal 302 will be embedded and fixed in the plastic-coated outer shell 201 of the stator core injection molding body 20.

[0050] It should be noted that the stator coil 301 is specifically formed by winding enameled wire a predetermined number of turns at each stator tooth 203 of the stator core injection molding body 20.

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

[0052] This embodiment also provides a water pump that can be applied to devices such as household appliances, automobiles, and industrial equipment (e.g., liquid cooling radiators for computers, servers, and communication equipment, some models of air conditioners, washing machines, dishwashers, bathroom products, and robot vacuum cleaners) to drive the flow of liquid media.

[0053] Please see Figures 7-10 The water pump in this embodiment includes the stator assembly 30 described above.

[0054] The water pump in this embodiment also 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, permanent magnets 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 portion 501 and an impeller portion 502 connected to the rotor portion 501, that is, the rotor portion 501 and the impeller portion 502 are integral structures; wherein, the outer surface of the rotor portion 501 is configured as a first arcuate surface 501a, so that the rotor portion 501 is approximately hemispherical.

[0057] The water pump is equipped with a liquid medium chamber 40. In this embodiment, the water pump has a shell, and the inner cavity of the shell is the liquid medium chamber 40. It can be understood that the water pump is equipped with an inlet and an outlet on the shell to connect the inner and outer sides of the liquid medium chamber 40. At least a portion of the inner wall of the liquid medium chamber 40 is configured as an arc-shaped inner wall surface 402, and the outer wall of the liquid medium chamber 40 corresponding to the arc-shaped inner wall surface 402 is configured as a second arc-shaped surface 401.

[0058] The rotor-impeller structure 50 is rotatably supported within the liquid medium chamber 40 of the water pump.

[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 of screw locking, snap-fit ​​fixing, and adhesive bonding.

[0060] Please refer to the following: Figure 9 In order to improve the utilization rate of the internal space of the water pump, reduce the size and weight of the water pump, and realize the miniaturization and lightweighting of the water pump, the first arc-shaped surface 501a of the rotor-impeller structure 50 is aligned with the arc-shaped 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-shaped surface 401 of the liquid medium chamber 40.

[0061] Please see Figures 8-10 Specifically, the impeller portion 502 of the rotor-impeller structure 50 has 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 in a fan-shaped structure, and a guide groove 502b is formed between two adjacent impeller bodies 502a; and each guide groove 502b has a balance through hole 501b that penetrates the rotor portion 501.

[0062] Compared to the arc-shaped blades commonly found in the prior art, the impeller body 502a with the above-described structure experiences less radial force, which can effectively prevent the rotor-impeller structure 50 from swaying, thereby preventing 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 disposed in the liquid medium chamber 40 of the water pump. In this embodiment, one end of the support shaft 60 is inserted and fixed to 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, which is embedded in the rotor part 501 of the rotor-impeller structure 50 by interference fit. 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 held in place by the stator assembly 30 by magnetic force, so that the rotor-impeller structure 50 will not easily detach from the ball bearing 601.

[0064] With the above configuration, the rotor-impeller structure 50 is circumferentially rotated and supported by the ball bearing 601 (instead of the traditional shaft center limit), thereby obtaining an open structure. This allows the liquid medium to easily enter and exit the space near the support shaft 60, the ball bearing 601, and the ball bearing mating part 503, thereby flushing away impurities in the above-mentioned locations. Impurities are not easy to accumulate in the above-mentioned locations, effectively avoiding the problem of the rotor-impeller structure 50 getting stuck.

[0065] In this embodiment, the water pump, when in use, supplies a specific current to the stator coil 301 of the stator assembly 30 through terminal 302 (this can be achieved through a drive circuit board with a stator drive module (or a dedicated stator drive chip)). This generates a rotating magnetic field in the inner ring of the stator assembly 30. Through this rotating magnetic field, the rotor-impeller structure 50 is magnetically coupled and rotated in the liquid medium chamber 40 of the water pump. Driven by the rotor-impeller structure 50, the liquid medium can flow in a specific direction (being drawn into the liquid medium chamber 40 of the water pump from the inlet and discharged from the outlet at a certain pressure and flow rate), thus realizing the basic function of the water pump.

[0066] In this embodiment, the stator core 10 has an inner ring surface 102 that is configured to be inclined in the axial direction, which can avoid mounting 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 internal space utilization of the water pump, reducing the volume and weight of the water pump, and realizing the miniaturization and weight reduction of the water pump.

[0067] In this embodiment, the stator core injection molded body 20 has a stator tooth portion 203 whose free side end face is configured as an inclined inner ring surface 203a that is inclined in the axial direction. This allows for the installation of 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 internal space utilization of the water pump, reducing the size and weight of the water pump, and achieving miniaturization and weight reduction of the water pump.

[0068] In this embodiment, the stator assembly 30 has a stator tooth portion 203 whose free side end face is configured as an inclined inner ring surface 203a that is inclined in the axial direction. This allows for the installation of 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 internal space utilization of the water pump, reducing the size and weight of the water pump, and achieving miniaturization and weight reduction of the water pump. In addition, the inner ring surface 102 is configured as a stator core 10 that is inclined in the axial direction, which has a low leakage flux and effectively improves the electrical energy to magnetic energy conversion efficiency of the stator assembly 30.

[0069] In this embodiment, the first arcuate surface 501a of the rotor-impeller structure 50 is aligned with the arcuate 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 arcuate surface 401 of the liquid medium chamber 40. In this way, the rotor-impeller structure 50, part of the outer wall of the liquid medium chamber 40, and the stator assembly 30 are approximately in the same radial plane in space without axial misalignment, which effectively improves the internal space utilization of the water pump, reduces the volume and weight of the water pump, and realizes the miniaturization and weight reduction of the water pump. In addition, the inner ring surface 102 is configured as a stator core 10 inclined to the axial direction, which has a low leakage flux and effectively improves the electrical energy to mechanical energy conversion efficiency of the water pump.

[0070] 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 stator core, characterized in that, It includes several stator steel sheet units stacked along the axial direction; The inner annular surface of the stator core is configured to be inclined in the axial direction.

2. The stator core according to claim 1, characterized in that, Each of the stator steel sheet units is composed of several stator steel sheets stacked along 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 aforementioned stator lamination units includes: A ring-shaped yoke, and a plurality of teeth formed on the inner side of the yoke and arranged in the circumferential direction; The free side end face of the tooth is defined as the tooth end face; After several stator steel sheet units are stacked along the axial direction, the tooth end face of each stator steel sheet unit forms a stepped structure, thereby making the inner ring surface of the stator core inclined to the axial direction.

4. The stator core according to claim 3, characterized in that, The stator steel sheet units stacked along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; Furthermore, the radial extension length of the teeth of each of the stator steel lamination units stacked along the axial direction is defined sequentially as L1, L2, L3, ..., L... n―1 L n Where 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel sheet units; Then we have: 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 along the axial direction are sequentially numbered 1, 2, 3, ..., n-1, n; Furthermore, the radial extension length of the teeth of each of the stator steel lamination units stacked along the axial direction is defined sequentially as L1, L2, L3, ..., L... n―1 L n Where 1, 2, 3, ..., n-1, n are the serial numbers of the stator steel sheet units; Then we have: L1―L2=L2―L3=…=L n―1 ―L n = a, where a is a constant.

6. A stator core injection molded body, characterized in that, Includes the stator core as described in any one of claims 1-5; It also includes a plastic-coated outer shell, which is integrally formed on the surface of the stator core in a plastic-coating manner; The molded stator core injection body includes: A ring-shaped stator yoke, and a plurality of stator teeth formed on the inner side of the stator yoke and arranged in the circumferential direction; The free side end face of the stator teeth is configured as an inclined inner ring surface tilted in the axial direction.

7. A stator assembly, characterized in that, Includes the stator core injection molded body as described in claim 6; It also includes stator coils wound around the stator teeth of the stator core injection body, and terminals that are plugged into and fixed to the plastic-coated outer shell of the stator core injection body and electrically connected to the stator coils.

8. A water pump, characterized in that, Includes the stator assembly as described in 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 surface of the rotor portion is configured as a first arcuate surface. The water pump is equipped 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, and 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 assembly is rotatably supported within 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-shaped surface of the rotor-impeller structure is aligned with the arc-shaped inner wall of the liquid medium chamber; the inclined inner ring surface of the stator assembly is aligned with the second arc-shaped 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 has several impeller bodies arranged in the circumferential direction. Each impeller body is configured in a fan shape, and a guide groove is formed between two adjacent impeller bodies; Furthermore, each of the aforementioned guide grooves is provided with a balance through hole penetrating the rotor section.

10. The water pump according to claim 8 or 9, characterized in that, The water pump has a support shaft with ball bearings installed in the liquid medium chamber. The rotor section of the rotor-impeller structure is fitted with a ball bearing fitting; The ball bearing assembly of the rotor-impeller structure mates with the ball bearing of the support shaft to rotatably support the rotor-impeller structure within the liquid medium chamber of the water pump.

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