A rotor assembly and a water pump using the same

Abstract

A rotor assembly and a water pump using the same, comprising a rotating shaft and a magnetic core fixed on the rotating shaft, characterized in that the magnetic core is in a columnar shape, an inner recess is formed in an axial end of the magnetic core along an axis, a connecting piece is arranged in the inner recess and fixedly connected with the magnetic core, and a gasket is fixedly connected with the connecting piece and away from the magnetic core. The rotor assembly of the utility model, the gasket is fixedly assembled on the inner recess of the magnetic core through the connecting piece, the axial space of the magnetic core can be fully utilized, and when the gasket and external parts are damaged due to impact or contact abrasion, the gasket can be directly disassembled from the connecting piece for replacement. The optimized rotor assembly structure is compact and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to a rotor assembly, and more particularly to a water pump with the rotor assembly, which is classified under IPC F04D13 / 06. Background Technology

[0002] Existing water pumps typically consist of a stator, a pump body fixed to the stator, and a rotor assembly rotatably mounted on the pump body. The rotor assembly usually has a rotor frame that fixes the magnetic core to the shaft. To reduce wear on the rotor assembly from other pump components during operation, shims are usually installed along the axial direction of the rotor assembly. However, due to the shims, the axial height of the pump body for mounting the rotor assembly needs to be increased accordingly. Furthermore, during operation, the shims may impact or contact the rotor assembly, causing wear or cracking of the magnetic core, necessitating replacement of the entire rotor assembly during maintenance.

[0003] Existing rotor assemblies suffer from problems such as large axial space requirements for assembly and high maintenance costs, thus necessitating improvements. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] A rotor assembly includes a rotating shaft and a magnetic core fixed on the rotating shaft, characterized in that: the magnetic core is columnar, with one axial end recessed along the axis to form a concave portion, a connector fixedly connected to the magnetic core is provided in the concave portion, and a gasket fixedly connected to the connector is provided on the side of the connector facing away from the magnetic core.

[0006] In this invention, the rotor assembly features a gasket that is fixedly mounted to the inner recess of the magnetic core via a connector. This design fully utilizes the axial space of the magnetic core. Furthermore, when the gasket is damaged due to impact or wear from external parts, it can be directly removed from the connector for replacement. The optimized rotor assembly of this invention has a compact structure and is easy to maintain.

[0007] Furthermore, the concave portion includes a first concave portion and a second concave portion formed by sinking the bottom surface of the first concave portion. The bottom surface of the second concave portion has a core fixing portion that surrounds the rotating shaft. The outer periphery of the core fixing portion has several circumferentially distributed first protrusions. The center of the connector is provided with a mounting hole that matches the shape of the core fixing portion. The connector is interference-fitted or transition-fitted onto the core fixing portion through the mounting hole.

[0008] Furthermore, the axial end face of the connector facing away from the magnetic core has a plurality of circumferentially distributed columnar first mounting portions. The gasket is a centrally penetrating columnar body, and its radial outer surface has a plurality of circumferentially distributed gasket protrusions. The gasket is interference-fitted or transition-fitted into the first mounting portion, and its gasket protrusions are correspondingly fitted into adjacent first mounting portions.

[0009] Furthermore, there is an axial gap between the gasket and the magnetic core fixing part, and the axial end face of the connector facing the gasket side is recessed to form a first notch that communicates with the axial gap.

[0010] Furthermore, a second notch is provided on the side of the connector axially close to the magnetic core.

[0011] Furthermore, the magnetic core is injection molded and fixed to the rotating shaft.

[0012] Furthermore, the outer diameter of the magnetic core is D1, the diameter of the first concave portion is D2, the diameter of the second concave portion is D3, and the distances from the axial end face of the magnetic core near the pad side to the bottom surfaces of the first and second concave portions are H1 and H2, respectively. Then, D2 / D1 = 0.65~0.66, D3 / D1 = 0.39~0.40; D3 / H1 = 1.82~1.88, D3 / H2 = 1.40~1.44 are satisfied simultaneously.

[0013] A water pump includes a stator assembly, a pump body fixed to the stator, an impeller seat fixed to the pump body, an impeller disposed in the central inner cavity of the impeller seat, and a top cover covering the impeller seat. The pump is characterized by further including any of the above-mentioned components, the rotor assembly being rotatably mounted on the pump body, its shaft extending into the impeller seat and fixedly connected to the impeller. This water pump, by optimizing the structure of the rotor assembly, reduces the axial height of the pump body and facilitates maintenance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the rotor assembly of this utility model;

[0015] Figure 2 This is an exploded structural diagram of the rotor assembly of this utility model;

[0016] Figure 3 This is an axial sectional view of the rotor assembly of this utility model;

[0017] Figure 4 yes Figure 3 A magnified schematic diagram of the structure of part A in the diagram;

[0018] Figure 5 This utility model is a Figure 1 Sectional view of mid-section BB;

[0019] Figure 6This utility model is a Figure 1 Sectional view of the mid-section CC;

[0020] Figure 7 This is a three-dimensional structural diagram of the connector used in this application;

[0021] Figure 8 This is an axial sectional view of the water pump of this utility model;

[0022] Wherein: 10-rotor assembly, 20-stator assembly, 30-pump body, 40-impeller seat, 41-impeller, 50-top cover, 100-shaft, 200-magnetic core, 210-recessed portion, 211-first recessed portion, 212-second recessed portion, 220-protrusion, 221-first protrusion, 300-connector, 310-connector body, 320-mounting hole, 330-first mounting part, 340-first notch, 350-second notch, 400-gasket, 410-gasket body, 420-gasket protrusion. Detailed Implementation

[0023] Figure 1 and Figure 2 This utility model discloses a rotor assembly 10, which includes a rotating shaft 100, a magnetic core 200 fixed on the rotating shaft 100, a connector 300, and a gasket 400. The magnetic core 200 is cylindrical, with one axial end recessed along its axis to form a concave portion 210. Both the connector 300 and the gasket 400 are assembled within the concave portion 210, and the gasket 400 connects the two via the connector 300. After assembly, the gasket 400 is fixed to the side of the connector 300 facing away from the magnetic core 200. Preferably, the connector 300 is fixedly mounted on the magnetic core 200 by radial interference or transition fit, and the gasket 400 is similarly fixedly mounted on the connector 300 by radial interference or transition fit. Further, to enhance the connection strength between the rotating shaft 100 and the magnetic core 200, the magnetic core 200 is fixed to the rotating shaft 100 by injection molding using the rotating shaft 100 as a mold insert. Of course, as other embodiments, the rotating shaft 100 can also be interference-fitted to the magnetic core 200, or fixed to the magnetic core by other fixed connection structures in the mechanical engineering manual; the connector 300 and the gasket 400 can also be fixed to the magnetic core 200 and the connector 300 respectively by snap-fitting or by other detachable connection structures in the mechanical engineering manual.

[0024] In this invention, the rotor assembly features a gasket that is fixedly mounted to the inner recess of the magnetic core via a connector. This design fully utilizes the axial space of the magnetic core. Furthermore, when the gasket is damaged due to impact or wear from external parts, it can be directly removed from the connector for replacement. The optimized rotor assembly of this invention has a compact structure and is easy to maintain.

[0025] Furthermore, see Figure 2 and Figure 3 The magnetic core 200 of this invention has a concave portion 210 including a first concave portion 211 and a second concave portion 212 formed by sinking the axial end face of the first concave portion 211. The bottom surface of the second concave portion 212 has a protruding magnetic core fixing portion 220 that surrounds the rotating shaft. The outer periphery of the magnetic core fixing portion 220 has several circumferentially distributed first protrusions 221. The connector 300 includes a columnar connector body 310 and a mounting hole 320 that axially penetrates the connector body 310 and is adapted to the shape of the magnetic core fixing portion 220. During assembly, the connector 300 is interference-fitted onto the magnetic core fixing portion 220 through the mounting hole 320. The magnetic core 200 designed above is simple to manufacture and facilitates the installation of the connector 300.

[0026] Furthermore, see Figure 2 , Figure 6 and Figure 7 The connector 300 of this invention further includes a plurality of circumferentially distributed columnar first mounting portions 310 axially protruding from the axial end face of the connector body 310 on the side opposite to the magnetic core 200. The gasket 400 includes a hollow columnar gasket body portion 410 and gasket protrusions 420 protruding outward from the radial surface of the gasket body portion 410. During rotor assembly, the gasket 400 is interference-fitted onto the first mounting portions 310, and after assembly, the gasket protrusions 420 are positioned between circumferentially adjacent first mounting portions 330. The connector 300 designed above facilitates the assembly and disassembly of the gasket 400 and prevents wear of the connector caused by gasket rotation.

[0027] Furthermore, see Figures 2 to 4 The connector body 310 of the connector 300 of this invention has an axially recessed first notch 340 on its axial end face facing the gasket 400. After the rotor assembly 10 of this invention is assembled, an axial gap is formed between the gasket 400 and the magnetic core fixing part 220 of the magnetic core 200, and the first notch 340 communicates with the axial gap. This design allows liquid to be introduced into the axial gap through the first notch, forming a water film between the gasket and the magnetic core, preventing the gasket from transferring heat to the magnetic core and causing a decrease in the magnetic core's performance, thus improving the stability of the rotor assembly. Furthermore, the connector 300 also has a second notch recessed on its axial end face near the magnetic core 200. This design allows liquid in the axial gap to drain from the second notch and flow into the gap between the connector and the second recessed part, dissipating heat between them and further improving the stability of the rotor assembly.

[0028] Furthermore, see Figure 3In this invention, the outer diameter of the magnetic core 200 is D1, the diameter of the first concave portion 211 is D2, the diameter of the second concave portion 212 is D3, the distance from the axial end face of the magnetic core 200 near the pad 400 to the bottom surface of the first concave portion 211 is H1, and the distance from the axial end face of the magnetic core 200 near the pad 400 to the bottom surface of the second concave portion 212 is H2. This design simultaneously satisfies the following conditions: D2 / D1 = 0.65–0.66, D3 / D1 = 0.39–0.40; D3 / H1 = 1.82–1.88, D3 / H2 = 1.40–1.44. This design ensures the magnetic performance of the rotor assembly 10 while reducing the axial dimension of the magnetic core 200.

[0029] This utility model also discloses a water pump, see Figure 8 The water pump includes a stator assembly 20, a pump body 30 fixed to the stator, an impeller seat 40 fixed to the pump body, an impeller 41 disposed in the central cavity of the impeller seat 40, an upper cover 50 covering the impeller seat, and the aforementioned rotor assembly 10. During assembly, the rotor assembly 10 is rotatably mounted on the pump body 10, and the shaft 10 of the rotor assembly 10 extends into the impeller seat 40 and is fixedly connected to the impeller 41. This utility model's water pump, by optimizing the structure of the rotor assembly, reduces the axial height of the pump body and facilitates maintenance.

[0030] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A rotor assembly comprising a rotor shaft (100) and a magnetic core (200) fixed to the rotor shaft (100), characterized in that: The magnetic core (200) is columnar, with one end of its axial direction recessed to form a concave portion (210). The concave portion (210) is provided with a connector (300) that is fixedly connected to the magnetic core (200). The connector (300) has a gasket (400) fixedly connected to the side facing away from the magnetic core.

2. The rotor assembly of claim 1, wherein: The recessed portion (210) includes a first recessed portion (211) and a second recessed portion (212) formed by sinking the bottom surface of the first recessed portion. The bottom surface of the second recessed portion (212) has a core fixing portion (220) that surrounds the rotating shaft. The outer periphery of the core fixing portion (220) has several circumferentially distributed first protrusions (221). The center of the connector (300) is provided with a mounting hole (320) that matches the shape of the core fixing portion (220). The connector (300) is interference-fitted or transition-fitted onto the core fixing portion (220) through the mounting hole (320).

3. The rotor assembly of claim 1, wherein: The connector (300) has a plurality of circumferentially distributed columnar first mounting portions (330) protruding on the axial end face facing away from the magnetic core (200). The gasket (400) is a centrally penetrating columnar body with a plurality of circumferentially distributed gasket protrusions (420) protruding outward on its radial outer surface. The gasket is interference-fitted or transition-fitted into the first mounting portion (330), and its gasket protrusions (420) are correspondingly fitted into adjacent first mounting portions (330).

4. The rotor assembly of claim 2, wherein: An axial gap exists between the gasket (400) and the magnetic core fixing part (220), and the connector (300) has a first notch (340) formed by the recess on the axial end face facing the gasket side, which communicates with the axial gap.

5. The rotor assembly of claim 2, wherein: The connector (300) has a second notch (350) on the side axially close to the magnetic core (200).

6. The rotor assembly of claim 1, wherein: The magnetic core (200) is injection molded and fixed on the rotating shaft (100).

7. The rotor assembly of claim 2, wherein: The outer diameter of the magnetic core (200) is D1, the diameter of the first concave portion (211) is D2, the diameter of the second concave portion (212) is D3, and the distances from the axial end face of the magnetic core (200) near the pad (400) to the bottom surfaces of the first concave portion (211) and the second concave portion (212) are H1 and H2, respectively. Then, D2 / D1=0.65~0.66, D3 / D1=0.39~0.40; D3 / H1=1.82~1.88, D3 / H2=1.40~1.44 are satisfied.

8. A water pump, comprising a stator assembly (20), a pump body (30) fixed to the stator, an impeller seat (40) fixed to the pump body, an impeller (41) disposed in the central cavity of the impeller seat (40), and an upper cover (50) covering the impeller seat, characterized in that: It also includes a rotor assembly (10) according to any one of claims 1-7, the rotor assembly (10) being rotatably mounted on the pump body (30), the shaft (100) extending into the impeller seat (40) and fixedly connected to the impeller (41).

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