Rotor assembly capable of prolonging starting service life and drainage pump

Abstract

The invention relates to the technical field of washing machine draining pump structures, and discloses a rotor assembly for prolonging the starting service life and a draining pump, the rotor assembly comprises an impeller, a rotating shaft and a shifting block, the impeller is fixed at one end of the rotating shaft, and the shifting block sleeves and is fixed adjacent to the other end of the rotating shaft; the rotor assembly further comprises a magnetic ring assembly and a fan-shaped rubber block, and a positioning groove is formed in the center of the outer cambered surface of the rubber block; the magnetic ring assembly comprises a magnetic ring injection molding body and a magnetic ring, and the magnetic ring is fixedly arranged on the outer layer of the magnetic ring injection molding body in a sleeving mode. The magnet ring injection molding body is coaxially arranged on the rotating shaft in a penetrating manner; a concave starting cavity is formed in one axial side end of the magnet ring injection molding body, a positioning block is arranged on the inner surface of the circumferential side wall of the starting cavity, a rubber block is arranged in the starting cavity, and the positioning groove is clamped into the positioning block. According to the rotor assembly, the fan-shaped rubber blocks are arranged, multi-directional limiting is added, the supporting stability is good, the shifting blocks make surface-to-surface contact with the rubber blocks when colliding, the stress area is increased, and the service life of the rubber blocks is prolonged.

Description

Technical Field

[0001] This invention relates to the field of washing machine drain pump technology, and more specifically to a rotor assembly and drain pump that increases start-up life. Background Technology

[0002] With the continuous technological advancements in the household washing machine industry, practical and user-friendly functions are being integrated and expanded, achieving multi-functionality. A single washing machine is increasingly incorporating features such as drying, dual-tub washing, triple-tub washing, and even multi-position washing. Consequently, the frequency and duration of wastewater discharge via the drain pump are constantly increasing. Therefore, the lifespan and reliability of the drain pump have become key issues that need to be addressed.

[0003] In related technologies, such as Figure 1 As shown, in a traditional drain pump rotor assembly (such as Chinese patent CN201858202U - a washing machine drain pump), a starting chamber is opened inside the impeller, and two rubber columns are set inside the starting chamber, which play a buffering role.

[0004] However, when the washing machine drain pump motor starts, the rotor paddle on the rotor shaft will hit the rubber column. The impact will cause the rubber column to move, which can easily cause the rubber column to tilt and be squeezed to one side, resulting in jamming and failure to start. In addition, at the moment of starting, the paddle and the rubber column make surface-line impact contact, and the rubber column is subjected to a large instantaneous force. Over a long period of use, the rubber column is prone to being crushed and broken, resulting in a short service life. Summary of the Invention

[0005] This application provides a rotor assembly and drainage pump that increases start-up life. It is equipped with a fan-shaped rubber block and multi-directional limiting, which provides good support stability. When the paddle block and the rubber block collide, they make face-to-face contact, increasing the force-bearing area and improving the service life of the rubber block.

[0006] In a first aspect, embodiments of this application provide a rotor assembly for increasing start-up life, comprising an impeller, a shaft, and a paddle, wherein the impeller is fixed to one end of the shaft, and the paddle is sleeved and fixed adjacent to the other end of the shaft; The rotor assembly further includes a magnetic ring assembly and a fan-shaped rubber block, with a positioning groove formed in the center of the outer arc surface of the rubber block; the magnetic ring assembly includes a magnetic ring injection molded body and a magnetic ring, with the magnetic ring sleeved and fixed to the outer layer of the magnetic ring injection molded body; the magnetic ring injection molded body is coaxially inserted through the rotating shaft; a concave starting cavity is provided at one axial end of the magnetic ring injection molded body, and a positioning block is provided on the inner surface of the circumferential side wall of the starting cavity; the rubber block is disposed in the starting cavity and the positioning groove is engaged with the positioning block.

[0007] In conjunction with the first aspect, in one embodiment, a disk is provided on the end face of the lever away from the magnetic ring; a flat limiting rib is provided on the inner end face of the starting cavity; and the rubber block is clamped between the disk and the limiting rib.

[0008] In conjunction with the first aspect, in one embodiment, the rotor assembly further includes a start-up chamber cover threaded to the outer surface of the circumferential sidewall of the start-up chamber, the inner surface of the flat plate portion of the start-up chamber cover being adjacent to or abutting the disk, and the rotating shaft passing through the center of the start-up chamber cover.

[0009] In conjunction with the first aspect, in one embodiment, the rotor assembly further includes two rubber O-rings, one rubber O-ring being fixed in the limiting groove of the magnetic ring injection body, and the other rubber O-ring being disposed in the limiting groove of the start-up chamber cover, with the two rubber O-rings sleeved on the rotating shaft.

[0010] In conjunction with the first aspect, in one embodiment, the rotor assembly further includes a bearing assembly, a rubber seal ring, and a bearing housing, wherein the bearing assembly is inserted into the center of the rubber seal ring, the rubber seal ring is inserted into the bearing housing, and the rotating shaft passes through the center holes of all bearings in the bearing assembly.

[0011] In conjunction with the first aspect, in one embodiment, the fan-shaped portion of the lever has two working surfaces, namely a first fan-shaped starting surface and a second fan-shaped starting surface; both the first fan-shaped starting surface and the second fan-shaped starting surface are matched with the side end face of the fan-ring-shaped rubber block.

[0012] In conjunction with the first aspect, in one embodiment, the thickness of the rubber block is greater than the length of the positioning groove.

[0013] In conjunction with the first aspect, in one embodiment, the impeller is welded to the end of the rotating shaft by ultrasonic welding; the lever is injection molded onto the rotating shaft by injection molding to form an integral structure; and the magnetic ring injection molded body is formed based on the magnetic ring by injection molding to form a magnetic ring assembly.

[0014] In conjunction with the first aspect, in one embodiment, the injection molding block portion of the rotating shaft and the welded impeller portion of the rotating shaft are both provided with knurled texture.

[0015] In conjunction with the second aspect, in one embodiment, a drainage pump includes a pump body, a motor housing, a stator assembly, and the aforementioned rotor assembly. The pump body is connected and fixed to the motor housing to form a mounting cavity, and the rotor assembly and stator assembly are mounted in the mounting cavity.

[0016] The beneficial effects of the technical solutions provided in this application include at least the following: 1. The rotor assembly of this application differs from traditional rotor assembly designs. The impeller and the lever are positioned on the shaft, with the lever fixedly mounted near the other end of the shaft. Consequently, the starting chamber is positioned differently, with a recessed design on one axial side end of the magnetic ring injection molded body. More importantly, a positioning block is provided on the inner surface of the circumferential side wall of the starting chamber, and a fan-shaped rubber block is placed inside the starting chamber. A positioning groove is opened in the center of the outer arc surface of the rubber block, and the positioning groove of the rubber block is engaged with the positioning block, thus stably fixing the rubber block. When the drainage pump starts and the lever impacts the rubber block, the rubber block will not move, solving the problem of rubber column movement, tilting, and jamming caused by compression in traditional rotor assemblies. Even more importantly, the fan-shaped rubber block uses its own side end face to impact and contact the lever, resulting in surface-to-surface contact between the lever and the rubber block. Compared to the surface-to-line contact between the rubber column and the lever in traditional rotor assemblies, this greatly increases the force-bearing area, making it less prone to damage and extending the service life of the rubber block.

[0017] 2. In the rotor assembly of this application, the rubber block is clamped in the middle of the positioning block within the starting chamber. On one side, the rubber block is supported by a limiting rib, which provides support. On the other side, the disc of the push block restricts the rubber block, preventing it from popping out due to force during operation. The rubber block has good support stability due to the three-way limiting (positioning block, limiting rib, and disc). When the drainage pump starts and the push block hits the rubber block, the rubber block does not move and will not jam, thus indirectly improving the service life of the rotor assembly.

[0018] 3. In the rotor assembly of this application, the start-up chamber cover makes the start-up chamber a closed cavity, which can prevent dust and sand. At the same time, the inner surface of the flat plate portion of the start-up chamber cover is adjacent to or attached to the disc, which further limits the positioning of the push block and makes it more stable.

[0019] 4. In the rotor assembly of this application, when the starting block of the drainage pump impacts the rubber block, the two fan-shaped starting surfaces on the block make full contact with the two end faces of the rubber block, which increases the force-bearing area on the side of the rubber block, disperses the force, and thus improves the service life of the rubber block. By impacting the rubber block, the noise of the impact during startup is reduced, which also improves the service life of the rotor assembly.

[0020] 5. The drain pump of this application, including a rotor assembly, optimizes the overall performance of the drain pump product, improves the quality of the washing machine, extends its lifespan, reduces noise, and effectively enhances the user experience. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 An exploded view of the rotor assembly provided in an embodiment of this application; Figure 2 A cross-sectional view of the rotor assembly provided in an embodiment of this application; Figure 3 A schematic diagram of the magnetic ring assembly provided in an embodiment of this application; Figure 4 A schematic diagram of a rubber block provided in an embodiment of this application; Figure 5 for Figure 4 Sectional view of AA; Figure 6 A schematic diagram of the paddle and rubber block inside the starting cavity provided in an embodiment of this application; Figure 7 An exploded view of the drainage pump provided in the embodiments of this application; In the diagram: 1. Starter chamber cover; 2. Rubber O-ring; 3. Shaft; 4. Pulley; 5. Rubber block; 6. Magnetic ring injection molded body; 7. Magnetic ring; 8. Bearing assembly; 9. Rubber sealing ring; 10. Bearing housing; 11. Impeller; 12. Knurled texture; 16. Starting cavity; 17. Disc; 18. Positioning groove; 19. Positioning block; 20. Restricting rib; 41. First sector-shaped starting surface; 42. Second sector-shaped starting surface; 23. Pump body; 24. Rotor assembly; 25. Motor housing; 26. Stator assembly; 100. Magnetic ring assembly. Detailed Implementation

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] This application provides a rotor assembly that increases start-up life. It features a fan-shaped rubber block with multi-directional support, providing good support stability. When the paddle block collides with the rubber block, they make face-to-face contact, increasing the force-bearing area and extending the service life of the rubber block. The rotor assembly optimizes the start-up method, reduces the start-up noise of the drainage pump, improves the start-up efficiency of the drainage pump, and further extends the service life of the drainage pump.

[0025] First, as Figures 1 to 6 As shown, this application discloses an embodiment of a rotor assembly for increasing start-up life, the rotor assembly including an impeller 11, a shaft 3 and a lever 4.

[0026] Impeller 11 is fixed to one end of shaft 3, and lever 4 is sleeved and fixed to the other end of shaft 3 nearby (see...). Figure 1 Specifically, the lever 4 is a certain distance from the side face of the other end of the rotating shaft 3. The positional arrangement of the impeller 11 and the lever 4 on the rotating shaft 3 in this application is completely different from that of a conventional rotor assembly (where the lever 4 is located inside the impeller 11).

[0027] The rotor assembly 24 also includes a magnetic ring assembly 100 and a fan-shaped rubber block 5, with a positioning groove 18 formed in the center of the outer arc surface of the rubber block 5. Specifically, as shown... Figure 4 and Figure 5 As shown, the fan-shaped rubber block 5 includes an inner arc surface and an outer arc surface, with a positioning groove 18 opened in the center of the outer arc surface.

[0028] like Figure 2 and Figure 3 As shown, the magnetic ring assembly 100 includes a magnetic ring injection molded body 6 and a magnetic ring 7 (see Figure 100). Figure 3 The magnetic ring 7 is sleeved and fixed to the outer layer of the magnetic ring injection body 6. The magnetic ring injection body 6 is coaxially inserted through the rotating shaft 3. A recessed starting cavity 16 is provided on one axial side end of the magnetic ring injection body 6, and a positioning block 19 is provided on the inner surface of the circumferential side wall of the starting cavity 16. The positioning groove 18 of the rubber block 5 is inserted into the positioning block 19.

[0029] Specifically, the magnetic ring injection body 6 has a central hole along its axis, and the rotating shaft 3 passes through the central hole.

[0030] Preferably, the magnetic ring injection body 6 has a concave center and convex sides, and the magnetic ring 7 is fitted in the concave center of the magnetic ring injection body 6.

[0031] Preferably, the positioning groove 18 and the positioning block 19 are interference-fitted, which further enhances the stability of the rubber block 5.

[0032] The rotor assembly of this application differs from traditional rotor assembly designs. The impeller 11 and the lever 4 are positioned on the rotating shaft 3, with the lever 4 sleeved and fixed near the other end of the rotating shaft 3. Consequently, the position of the starting cavity 16 is different; the starting cavity 16 is recessed at one axial end of the magnetic ring injection molded body 6. More importantly, a positioning block 19 is provided on the inner surface of the circumferential side wall of the starting cavity 16, and a fan-shaped rubber block 5 is provided inside the starting cavity 16. A positioning groove 18 is formed in the center of the outer arc surface of the rubber block 5. With the positioning block 19 engaged, the rubber block 5 is stably fixed. When the drainage pump starts and the pusher block 4 impacts the rubber block 5, the rubber block 5 will not move. This solves the problem of rubber column movement and tilting causing compression and jamming in traditional rotor assemblies. More importantly, the fan-shaped rubber block 5 uses its own side end face to impact and contact the pusher block 4. When the pusher block 4 and the rubber block 5 impact, they make surface contact. Compared with the surface line contact between the rubber column and the pusher block in traditional rotor assemblies, this greatly increases the force-bearing area, makes it less prone to damage, and improves the service life of the rubber block.

[0033] like Figure 2 and Figure 3 As shown, in one embodiment, a disk 17 is provided on the end face of the lever 4 away from the magnetic ring 7. The disk 17 is in the shape of a circular plate. A flat limiting rib 20 is provided on the inner end face of the starting cavity 16. The limiting rib 20 is used to support the rubber block 5. The rubber block 5 is held between the disk 17 and the limiting rib 20.

[0034] In the rotor assembly of this application, within the starting chamber 16, the rubber block 5 is secured by the positioning block 19. On one side, the rubber block 5 is supported by the limiting rib 20, which provides support; on the other side, it is restricted by the disc 17 of the lever block 4. The disc 17 presses down on the rubber block 5, preventing it from popping out due to force during operation. The rubber block 5 has good support stability due to the three-way limiting (positioning block 19, limiting rib 20, and disc 17). When the drainage pump starts and the lever block hits the rubber block 5, the rubber block 5 does not move and will not jam, thus indirectly improving the service life of the rotor assembly.

[0035] like Figure 2 As shown, in one embodiment, the rotor assembly further includes a start-up chamber cover 1, which is threaded onto the outer surface of the circumferential sidewall of the start-up chamber 16.

[0036] The inner surface of the flat portion of the start chamber cover 1 is adjacent to or fits against the disk 17, and the pivot 3 passes through the center of the start chamber cover 1. Specifically, the start chamber cover 13 includes a circumferential portion and a flat portion, and the circumferential portion is threaded to the outer surface of the circumferential side wall of the start chamber 16.

[0037] In the rotor assembly of this application, the starter chamber cover 1 makes the starter chamber 16 a closed cavity, which can prevent dust and sand. At the same time, the inner surface of the flat plate portion of the starter chamber cover 1 is adjacent to or attached to the disc 17, which further limits the position of the toggle block 4 and makes it more stable. like Figure 1 and Figure 2 As shown, in one embodiment, the rotor assembly further includes two rubber O-rings 2. One rubber O-ring 2 is fixed in the limiting groove of the magnetic ring injection body 6, serving as a support and sealing function; the other rubber O-ring 2 is disposed in the limiting groove of the start chamber cover 1, also serving as a support and sealing function.

[0038] Two rubber O-rings 2 are fitted onto the rotating shaft 3, which enhances the sealing performance.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment, the rotor assembly further includes a bearing assembly 8, a rubber seal ring 9, and a bearing housing 10. The bearing assembly 8 is inserted into the center of the rubber seal ring 9, the rubber seal ring 9 is inserted into the interior of the bearing housing 10, and the rotating shaft 3 passes through the center holes of all the bearings in the bearing assembly 8.

[0040] like Figure 6 As shown, in one embodiment, the fan-shaped portion of the lever 4 has two working surfaces, namely a first fan-shaped starting surface 41 and a second fan-shaped starting surface 42; both the first fan-shaped starting surface 41 and the second fan-shaped starting surface 42 are matched with the side end face of the fan-ring-shaped rubber block 5.

[0041] Specifically, the area of ​​the two fan-shaped starting surfaces is equal to the area of ​​the side end face of the fan-ring-shaped rubber block 5.

[0042] In the rotor assembly of this application, when the starting block 4 of the drainage pump impacts the rubber block 5, the two fan-shaped starting surfaces on the block 4 make full contact with the two end faces of the rubber block 5, which increases the force-bearing area on the side of the rubber block 5, disperses the force, and thus improves the service life of the rubber block 5. By impacting the rubber block 5, the noise of the impact during startup is reduced, which also improves the service life of the rotor assembly.

[0043] like Figure 4 As shown, preferably, the thickness of the rubber block 5 (its dimension along the axial direction of the rotating shaft) is greater than the length of the positioning groove 18 (its dimension along the axial direction of the rotating shaft), meaning that the positioning groove 18 and the positioning block 19 do not penetrate the rubber block 5. The rubber block 5 is inserted into the positioning block 19, and the rubber block 5 covers the side end face of the positioning block 19, making the connection more stable and reliable.

[0044] Specifically, the dimensions of the positioning groove 18 and the positioning block 19 are set according to requirements.

[0045] Furthermore, the impeller 11 is welded to the end of the rotating shaft 3 using an ultrasonic welding process, resulting in a finer and more robust weld.

[0046] Furthermore, the lever 4 is injection molded onto the rotating shaft 3 through an injection molding process to form an integrated structure, which is more stable and reliable than a separate connection.

[0047] The magnetic ring injection molded body 6 is formed by injection molding based on the magnetic ring 7 through injection molding process to form the magnetic ring assembly 100. The magnetic ring assembly 100 has good integrity and is stable and reliable.

[0048] like Figure 2 As shown, furthermore, the injection molding block 4 in the rotating shaft 3 and the welding impeller 11 in the rotating shaft 3 are both provided with knurled texture 12. The knurled texture 12 can improve the firmness of injection molding and welding, withstand more starts, and improve service life.

[0049] Secondly, such as Figure 7 As shown, this application also discloses a drainage pump, comprising a pump body 23, a motor housing 25, a stator assembly 26 and the aforementioned rotor assembly 24. The pump body 23 is connected and fixed to the motor housing 25 to form a mounting cavity, and the rotor assembly 24 and the stator assembly 26 are mounted in the mounting cavity.

[0050] The connection relationship between the pump body 23, motor housing 25, stator assembly 26 and rotor assembly 24 is basically the same as that of a conventional washing machine drain pump, and will not be described in detail in this application.

[0051] The drain pump of this application, including the aforementioned rotor assembly 24, optimizes the overall performance of the drain pump product, improves the quality of the washing machine, extends its lifespan, reduces noise, and effectively enhances the user experience.

[0052] Regarding the drain pump, further, a disc 17 is provided on the end face of the lever 4 away from the magnetic ring 7, and the disc 17 is in the shape of a circular plate. A flat limiting rib 20 is provided on the inner end face of the starting cavity 16, and the limiting rib 20 is used to support the rubber block 5. The rubber block 5 is clamped between the disc 17 and the limiting rib 20.

[0053] In the drainage pump of this application, the rubber block 5 is clamped in the middle of the positioning block 19 within the starting chamber 16. On one side, the rubber block 5 is supported by the limiting rib 20, which plays a supporting role. On the other side, it is restricted by the disc 17 of the push block 4. The disc 17 presses down on the rubber block 5 to prevent the rubber block 5 from popping out due to force during operation. The rubber block 5 has good support stability through the three-way limiting (positioning block 19, limiting rib 20 and disc 17). When the drainage pump starts and the push block hits the rubber block 5, the rubber block 5 does not move and will not jam, which indirectly improves the service life of the rotor assembly.

[0054] like Figure 2As shown, in one embodiment, the rotor assembly further includes a start-up chamber cover 1, which is threaded onto the outer surface of the circumferential sidewall of the start-up chamber 16.

[0055] The inner surface of the flat portion of the start chamber cover 1 is adjacent to or fits against the disk 17, and the pivot 3 passes through the center of the start chamber cover 1. Specifically, the start chamber cover 13 includes a circumferential portion and a flat portion, and the circumferential portion is threaded to the outer surface of the circumferential side wall of the start chamber 16.

[0056] In the drainage pump of this application, the start-up chamber cover 1 forms a closed cavity for the start-up chamber 16, which is dustproof and sandproof. Simultaneously, the inner surface of the flat plate portion of the start-up chamber cover 1 is adjacent to or fitted against the disc 17, further limiting the position of the lever 4 and enhancing stability. Figure 6 As shown, in one embodiment, the fan-shaped portion of the lever 4 has two working surfaces, namely a first fan-shaped starting surface 41 and a second fan-shaped starting surface 42; both the first fan-shaped starting surface 41 and the second fan-shaped starting surface 42 are matched with the side end face of the fan-ring-shaped rubber block 5.

[0057] Specifically, the area of ​​the two fan-shaped starting surfaces is equal to the area of ​​the side end face of the fan-ring-shaped rubber block 5.

[0058] In the drainage pump of this application, when the starting block 4 of the drainage pump strikes the rubber block 5, the two fan-shaped starting surfaces on the block 4 make full contact with the two end faces of the rubber block 5, which increases the force-bearing area on the side of the rubber block 5, disperses the force, and thus improves the service life of the rubber block 5. By striking the rubber block 5, the noise of the impact during startup is reduced, and the service life of the rotor assembly is also improved.

[0059] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rotor assembly for increasing start-up life, comprising an impeller (11), a shaft (3), and a lever (4), characterized in that: The impeller (11) is fixed to one end of the rotating shaft (3), and the lever (4) is sleeved and fixed to the vicinity of the other end of the rotating shaft (3); The rotor assembly (24) also includes a magnetic ring assembly (100) and a fan-shaped rubber block (5), wherein a positioning groove (18) is provided in the center of the outer arc surface of the rubber block (5); The magnetic ring assembly (100) includes a magnetic ring injection body (6) and a magnetic ring (7). The magnetic ring (7) is sleeved and fixed on the outer layer of the magnetic ring injection body (6). The magnetic ring injection body (6) is coaxially inserted through the rotating shaft (3). A recessed starting cavity (16) is provided on one axial side end of the magnetic ring injection body (6). A positioning block (19) is provided on the inner surface of the circumferential side wall of the starting cavity (16). The rubber block (5) is disposed in the starting cavity (16) and the positioning groove (18) is engaged with the positioning block (19).

2. The rotor assembly for increasing start-up life as described in claim 1, characterized in that: The push block (4) has a disk (17) on its end face away from the magnetic ring (7); the inner end face of the starting cavity (16) has a flat limiting rib (20); the rubber block (5) is held between the disk (17) and the limiting rib (20).

3. A rotor assembly for increasing start-up life as described in claim 2, characterized in that: The rotor assembly also includes a start-up chamber cover (1), which is threaded to the outer surface of the circumferential sidewall of the start-up chamber (16), and the inner surface of the flat plate portion of the start-up chamber cover (1) is adjacent to or attached to the disk (17), and the rotating shaft (3) passes through the center of the start-up chamber cover (1).

4. A rotor assembly for increasing start-up life as described in claim 3, characterized in that: The rotor assembly also includes two rubber O-rings (2), one rubber O-ring (2) is fixed in the limiting groove of the magnetic ring injection body (6), and the other rubber O-ring (2) is set in the limiting groove of the start chamber cover (1). The two rubber O-rings (2) are sleeved on the rotating shaft (3).

5. A rotor assembly for increasing start-up life as described in claim 1, characterized in that: The rotor assembly also includes a bearing assembly (8), a rubber seal (9), and a bearing housing (10). The bearing assembly (8) is inserted into the center of the rubber seal (9), and the rubber seal (9) is inserted into the bearing housing (10). The rotating shaft (3) passes through the center holes of all the bearings in the bearing assembly (8).

6. A rotor assembly for increasing start-up life as described in claim 1, characterized in that: The fan-shaped part of the push block (4) has two working surfaces, namely a first fan-shaped starting surface (41) and a second fan-shaped starting surface (42); the first fan-shaped starting surface (41) and the second fan-shaped starting surface (42) are both matched with the side end face of the fan-ring-shaped rubber block (5).

7. A rotor assembly for increasing start-up life as described in claim 1, characterized in that: The thickness of the rubber block (5) is greater than the length of the positioning groove (18).

8. A rotor assembly for increasing start-up life as described in claim 1, characterized in that: The impeller (11) is welded to the end of the rotating shaft (3) by ultrasonic welding process; The push block (4) is injection molded onto the rotating shaft (3) by injection molding process to form an integral structure; The magnetic ring injection molded body (6) is formed by injection molding based on the magnetic ring (7) through an injection molding process to form a magnetic ring assembly (100).

9. A rotor assembly for increasing start-up life as described in claim 8, characterized in that: The injection molding block (4) part of the rotating shaft (3) and the welding impeller (11) part of the rotating shaft (3) are both provided with knurled (12).

10. A drainage pump, characterized in that, The device includes a pump body (23), a motor housing (25), a stator assembly (26), and a rotor assembly (24) as described in any one of claims 1 to 9. The pump body (23) is connected and fixed to the motor housing (25) to form a mounting cavity, and the rotor assembly (24) and the stator assembly (26) are mounted in the mounting cavity.

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