Three-phase drain motor for washing machine

Abstract

The present invention belongs to the technical field of washing machines, and in particular to a three-phase drainage motor for washing machines, comprising a stator, a rotor and an upper cover, wherein the rotor is sealed inside the stator through the upper cover, the stator comprises an iron core, a coil skeleton, a three-phase coil and a plastic sealing part, the iron core comprises a hub, an inner ring and teeth, the teeth radially connect the hub and the inner ring, the inner ring is a nine-segment circular arc structure, the coil skeleton is coated on the teeth, the three-phase coil is wound on the coil skeleton, the plastic sealing part wraps the coil skeleton, the three-phase coil and the iron core to form a stopper, a rotor cavity and a shaft cavity, the stopper is above the rotor cavity, the shaft cavity is at the bottom of the rotor cavity, the plastic sealing part comprises an outer shell, a wall surface of the rotor cavity and a wall surface of the shaft cavity, and the outer shell, the wall surface of the rotor cavity and the wall surface of the shaft cavity are integrally injection molded. The rotor cavity wall surface of the three-phase drainage motor for washing machines provided by the present invention not only reduces the motor air gap and improves the motor efficiency, but also prevents the noise problem caused by the rust of the nine-segment circular arc surface of the inner ring of the iron core.

Description

Technical Field

[0001] The invention belongs to the technical field of washing machines, and in particular relates to a three-phase drainage motor for a washing machine. Background Art

[0002] At present, most of the three-phase drainage motors for washing machines on the market adopt a stator without plastic sealing structure, that is, the rotor is installed in a motor shell with a rotor cavity, and the nine-segment circular arc surface of the inner ring of the iron core is directly sleeved on the outer wall of the motor shell. The thickness of the outer wall of the motor shell causes the motor air gap between the rotor and the inner ring of the iron core to increase. As we all know, the motor air gap is an important indicator for measuring motor efficiency, so this stator structure without plastic sealing has low motor efficiency, and the exposed iron core is also prone to rust. There is also a stator semi-plastic sealing structure of a three-phase drainage motor on the market, that is, the coil skeleton, coil, and the hub and teeth of the iron core are sealed with engineering plastics, while the nine-segment circular arc surface of the inner ring of the iron core is exposed to the air. The purpose of this is to minimize the gap between the rotor and the nine-segment circular arc surface of the inner ring of the iron core, that is, the motor air gap, so as to improve the motor efficiency, but it ignores the rust problem caused by the nine-segment circular arc surface of the inner ring of the iron core not being plastic sealed. The rust tumors generated on the nine-segment circular arc surface are easy to rub against the outer circle of the rotor and cause noise. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a three-phase drainage motor for a washing machine, aiming to solve the technical problems in the prior art of large motor air gap, low motor efficiency and noise generated by rust on the inner ring of the iron core.

[0004] The three-phase drainage motor for a washing machine provided by the present invention has the following specific technical solutions:

[0005] A three-phase drainage motor for a washing machine comprises a stator, a rotor and an upper cover, wherein the rotor is sealed inside the stator through the upper cover.

[0006] The stator comprises an iron core, a coil frame, a three-phase coil and a plastic sealing part, the iron core comprises a wheel hub, an inner ring and teeth, the teeth radially connect the wheel hub and the inner ring, the inner ring is a nine-segment arc structure, the coil frame is coated on the teeth, the three-phase coil is wound on the coil frame, the plastic sealing part wraps the coil frame, the three-phase coil and the iron core to form a stopper, a rotor cavity and a shaft cavity, the stopper is above the rotor cavity, the shaft cavity is at the bottom of the rotor cavity, the plastic sealing part comprises an outer shell, a wall surface of the rotor cavity and a wall surface of the shaft cavity, and the outer shell, the wall surface of the rotor cavity and the wall surface of the shaft cavity are integrally formed by injection molding,

[0007] The rotor is provided with three pairs of permanent magnets and is installed in the rotor cavity. The rotating shaft of the rotor passes through the upper cover, and the upper cover is detachably connected to the stator.

[0008] In some embodiments, the diameter of the rotor cavity is smaller than the diameter of the stop, the material of the plastic sealing portion is BMC plastic, and the wall thickness of the plastic sealing portion between the side wall surface of the rotor cavity and the nine circular arc surfaces of the inner ring of the iron core is less than 0.6 mm.

[0009] In some embodiments, the upper cover includes a cover body and a sealing ring, the cover body is provided with an axial hole at its axial center, the cover body protrudes toward the stator to form an installation cavity and a positioning ring, the installation cavity and the positioning ring are coaxially arranged with the axial hole, and the diameter of the positioning ring is larger than the installation cavity, the sealing ring is tightly matched with the rotor cavity, the sealing ring includes an annular substrate, the annular substrate protrudes axially to form a mounting portion, the mounting portion is cylindrical and is coaxially arranged with the sealing ring, the mounting portion is arranged on the rotating shaft of the rotor through a bearing sleeve, and the inner wall of the mounting portion is tightly matched with the bearing, the mounting portion is tightly embedded in the installation cavity, and a positioning groove is also provided on the annular substrate, and the positioning ring is matched with the positioning groove.

[0010] In some embodiments, a plurality of slots are formed at the lower portion of the cover body, and the slots are evenly distributed around the axis on the outer circumference of the cover body. A plurality of blocks are disposed at the upper portion of the stator, and the blocks are slidably engaged with the slots.

[0011] In some embodiments, the cover body protrudes in a direction away from the stator to form a concave cavity, and the concave cavity is coaxially arranged with the axial hole.

[0012] In some embodiments, a plurality of reinforcing ribs are evenly arranged between the installation cavity and the positioning ring, and the reinforcing ribs are arranged along the radial direction of the upper cover.

[0013] The annular substrate is further provided with a platform, a groove is formed between the platform and the mounting portion, the groove is engaged with the edge of the mounting cavity, and the platform is matched with the reinforcing rib.

[0014] A retaining ring is also provided on the outer periphery of the annular base plate, and the positioning groove is formed between the retaining ring and the platform. The positioning ring is a step structure, and the positioning ring is tightly matched with the positioning groove and the retaining ring. The outer wall of the retaining ring protrudes to form two sealing outer rings, and the sealing outer rings are arranged at intervals from each other.

[0015] In some embodiments, the outer wall of the bearing is recessed to form a sealing groove, the inner wall of the mounting portion is provided with a sealing inner ring that seals with the sealing groove, the cross-section of the sealing groove is rectangular, the cross-section of the sealing inner ring is semicircular, and the end of the mounting portion protrudes to form an annular sealing lip that tightly fits with the hole wall of the shaft hole.

[0016] In some embodiments, the shaft cavity is tightly embedded with an end sleeve, an oil storage cavity is formed inside the end sleeve, the rotor rear shaft extends into the oil storage cavity, the rotor rear shaft is movably arranged in the oil storage cavity, the inner hole of the end sleeve is arranged in contact with the outer diameter of the rotor rear shaft, and the end surface of the rotor rear shaft is spaced apart from the bottom surface of the oil storage cavity.

[0017] In some embodiments, the end sleeve includes a support sleeve, a rubber sleeve and a sleeve shell, the rubber sleeve is tightly sleeved on the support sleeve, the sleeve shell is tightly sleeved on the rubber sleeve, and the sleeve shell is arranged in the shaft cavity.

[0018] An annular support platform is arranged at the upper end of the support sleeve, the diameter of which is larger than the diameter of the rotating shaft cavity, and the annular support platform is arranged above the rotor cavity and fits tightly with the bottom surface of the rotor cavity. The bottom end of the rubber sleeve radially extends to form a fixing ring, the inner diameter of the fixing ring is smaller than the inner diameter of the support sleeve, and a plurality of notches are evenly opened at the sleeve shell port, and the depth of the notches is smaller than the height of the rubber sleeve.

[0019] The present invention has the following beneficial effects: the three-phase drainage motor for washing machines provided by the present invention has an inner ring of an iron core of a nine-segment circular arc structure, the coil skeleton, the three-phase coil and the iron core are all covered by a plastic sealing part, the plastic injection molding part includes the wall surface of the rotor cavity, the wall surface of the circular hole at the bottom of the rotor cavity and the wall surface of the stopper, and the wall surface of the rotor cavity, the wall surface of the shaft cavity and the wall surface of the stopper are integrally injection molded. The wall surface of the rotor cavity reduces the air gap of the motor and improves the efficiency of the motor, while preventing the noise problem caused by rust on the nine-segment circular arc surface of the inner ring of the iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic plan view of the structure of a three-phase drainage motor for a washing machine of the present invention;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the iron core, three-phase coil and coil frame of the present invention;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the iron core of the present invention;

[0023] Figure 4 It is a schematic diagram of the planar structure of the cover body of the present invention;

[0024] Figure 5It is a schematic diagram of the three-dimensional structure of the cover body of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the stator of the present invention;

[0026] Figure 7 It is a schematic diagram of the planar structure of the sealing ring of the present invention;

[0027] Figure 8 is a structural schematic diagram of a bearing of the present invention;

[0028] Fig. 9 It is a schematic diagram of the planar structure of the stator of the present invention;

[0029] Fig.10 It is a three-dimensional structural schematic diagram of the end sleeve of the present invention;

[0030] Fig.11 It is a three-dimensional structural schematic diagram of the support sleeve of the present invention;

[0031] Fig.12 It is a three-dimensional structural schematic diagram of the rubber sleeve of the present invention;

[0032] Fig.13 It is a three-dimensional structural schematic diagram of the casing of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following is a detailed description of the present invention in conjunction with the accompanying drawings. Figure 1-13 , the present invention is further described in detail.

[0034] The three-phase drainage motor for a washing machine provided by the present invention has the following specific scheme:

[0035] A three-phase drainage motor for a washing machine includes a stator 1, a rotor 2 and an upper cover 3, wherein the rotor 2 is sealed inside the stator 1 through the upper cover 3. The stator 1 includes an iron core 11, a coil frame 12, a three-phase coil 13 and a plastic sealing portion 14, wherein the iron core 11 includes a hub 111, an inner ring 112 and teeth 113, wherein the teeth 113 radially connect the hub 111 and the inner ring 112, wherein the inner ring 112 is a nine-segment circular arc structure, wherein the coil frame 12 is coated on the teeth 113, wherein the three-phase coil 13 is wound on the coil frame 12, wherein the plastic sealing portion 14 wraps the coil frame 12, the three-phase coil 13 and the iron core 11, forming a stop 126, a rotor cavity 125 and a shaft cavity 127, wherein the stop 126 is above the shaft cavity 127, and the shaft cavity 127 is at the bottom of the rotor cavity 125. The plastic sealing part 14 includes a shell 141, a wall surface of the rotor cavity 125 and a wall surface of the shaft cavity 127, and the shell 141, the wall surface of the rotor cavity 125 and the wall surface of the shaft cavity 127 are integrally injection molded. In this way, the rotor cavity 125 is prevented from entering with water or humid air, which causes the inner ring 112 to rust. The generated rust tumors rub against the outer circle of the rotor 2 and generate noise. The gap between the arc structures of the inner ring 112 is filled by the plastic sealing part 14, which is an integral injection molding with the wall surface of the rotor cavity 125, thus enhancing the stability and strength of the inner wall of the rotor cavity 125. The rotor 2 is provided with a three-pole permanent magnet and is installed in the rotor cavity 125. The shaft of the rotor 2 is penetrated by an upper cover 3, which is detachably connected to the stator 1. The upper cover 3 is easy to disassemble, which helps to more clearly understand the rotor 2 inside the motor.

[0036] Further, the diameter of the rotor cavity 125 is smaller than the diameter of the stop 126, the rotor cavity 125 is used to accommodate the rotor 2, the shaft cavity 127 is used to accommodate and support the rear shaft 21 of the rotor, the stop 126 is used to support the front shaft assembly of the rotor 2, the material of the plastic sealing part 14 is BMC plastic, and the wall thickness of the plastic sealing part 14 between the side wall surface 1251 of the rotor cavity 125 and the nine-segment circular arc surface of the inner ring 112 of the core 11 is less than 0.6 mm. The wall thickness (t) of the plastic sealing part is less than 0.6 mm. Under the condition of ensuring the stability and strength of the wall thickness of the side wall of the rotor cavity 125, and under the premise that the wall surface of the rotor cavity 125 and the outer circle of the rotor 2 do not rub, the smaller t is, the better, and it is better to select t between 0.3 mm and 0.4 mm, so that the gap between the rotor 2 and the inner ring 112, that is, the motor air gap, can be reduced to improve the efficiency of the motor, and the rust tumors caused by the rust of the nine-segment circular arc surface can be prevented from rubbing against the outer circle of the rotor 2 and causing noise.

[0037] Furthermore, the upper cover 3 includes a cover body 31 and a sealing ring 32. The cover body 31 is provided with an axial hole 311 at its axial center. The cover body 31 protrudes toward the stator 1 to form a mounting cavity 312 and a positioning ring 313. The mounting cavity 312 and the positioning ring 313 are coaxially arranged with the axial hole 311, and the diameter of the positioning ring 313 is larger than that of the mounting cavity 312. The positioning ring 313 is arranged at the periphery of the mounting cavity 312. The sealing ring 32 is closely matched with the rotor cavity 125, thereby ensuring the sealing of the rotor cavity 125. The sealing ring 32 includes an annular base plate 321, which protrudes axially to form a mounting portion 322. The mounting portion 322 is cylindrical and is coaxially arranged with the sealing ring 32. The mounting portion 322 is sleeved on the rotating shaft of the rotor 2 through a bearing 33, and the inner wall of the mounting portion 322 is tightly matched with the bearing 33. The mounting portion 322 is tightly embedded in the mounting cavity 312, and a positioning groove 323 is further provided on the annular base plate 321. The positioning ring 313 cooperates with the positioning groove 323. The mutual engagement between the positioning groove 323 and the positioning ring 313 further enhances the airtightness and more effectively prevents water from entering the motor shaft.

[0038] Furthermore, the cover 31 protrudes in the direction away from the stator 1 to form a concave cavity 317, and the concave cavity 317 is coaxially arranged with the shaft hole 311. In this way, the concave cavity 317 effectively prevents foreign matter from being entangled in the root of the impeller and the motor output shaft.

[0039] Furthermore, a plurality of slots 314 are provided at the lower part of the cover 31, and the slots 314 are evenly distributed around the axis on the outer peripheral surface of the cover 31. A plurality of blocks 128 are provided at the upper part of the stator 1, and the blocks 128 are slidably engaged with the slots 314. The cover 31 is slidably engaged with the slots 314 through the blocks 128, so that it is easy to disassemble and assemble, and it is easy to replace the rotor 2.

[0040] Furthermore, a plurality of reinforcing ribs 316 are evenly arranged between the mounting cavity 312 and the positioning ring 313. The reinforcing ribs 316 are arranged along the radial direction of the upper cover 3. The annular base plate 321 is also provided with reinforcing ribs 324. A groove 326 is formed between the reinforcing ribs 324 and the mounting portion 322. The groove 326 is engaged with the edge of the mounting cavity 312. The reinforcing ribs 324 cooperate with the reinforcing ribs 316. In this way, the reinforcing ribs 316 are arranged to strengthen the strength around the shaft hole 311 on the one hand, and cooperate with the sealing ring 32 on the other hand to further enhance the airtightness.

[0041] A retaining ring 327 is also provided on the outer periphery of the annular base plate 321. A positioning groove 323 is formed between the retaining ring 327 and the reinforcing rib 324. The positioning ring 313 is a step structure. The positioning ring 313 is in close cooperation with the positioning groove 323 and the retaining ring 327. The outer wall of the retaining ring 327 protrudes to form two sealing outer rings 328, and the sealing outer rings 328 are arranged at intervals. The tight cooperation between the positioning ring 313 and the positioning groove 323 further strengthens the tightness between the sealing ring 32 and the cover body 31. The sealing outer ring 328 strengthens the tightness between the sealing ring 32 and the rotor cavity 125, preventing the water flow that penetrates into the joint between the cover body 31 and the outer circle of the stator 1 from entering the cavity of the stator 1, thereby improving the waterproof performance of the overall motor.

[0042] Furthermore, the outer wall of the bearing 33 is recessed to form a sealing groove 331, and the inner wall of the mounting portion 322 is provided with a sealing inner ring 34 that is sealed with the sealing groove 331. The cross section of the sealing groove 331 is rectangular, and the cross section of the sealing inner ring 34 is semicircular. In this way, the mounting portion 322 is sleeved on the bearing 33, and the sealing groove 331 and the sealing inner ring 34 are engaged to achieve the sealing cooperation between the mounting portion 322 and the bearing 33. The end of the mounting portion 322 protrudes to form an annular sealing lip 329, and the annular sealing lip 329 is tightly matched with the hole wall of the shaft hole 311. In this way, the rotating shaft of the rotor 2 passes through the shaft hole 311, and the sealing of the shaft hole 311 is ensured by the annular sealing lip 329.

[0043] Furthermore, the shaft cavity 127 is tightly embedded with the end sleeve 4, and the end sleeve 4 will not be driven to rotate by the shaft of the rotor 2 in the shaft cavity 127. An oil storage cavity 44 is formed inside the end sleeve 4, and the oil storage cavity 44 is used to store lubricating oil. The rotor rear shaft 21 extends into the oil storage cavity 44, and the rotor rear shaft 21 is movably arranged in the oil storage cavity 44. The inner hole of the end sleeve 4 is arranged in contact with the outer diameter of the rotor rear shaft 21, that is, the inner wall side of the oil storage cavity 44 is arranged in contact with the outer wall side of the rotor rear shaft 21. The contact with the inner wall side of the end sleeve 4 ensures the stability of the rotor 2 shaft during rotation and avoids causing rotation deviation. The end face of the rotor rear shaft 21 is spaced from the bottom surface of the oil storage cavity 44 to reduce the probability of the rotor rear shaft 21 wearing the bottom of the end sleeve 4. The end sleeve 4 is arranged between the rotor shaft 2 and the shaft cavity 127, thereby blocking the wear of the rotor 2 on the side wall of the shaft cavity 127, forming a lubricating oil storage space, effectively preventing the possibility of lubricating oil seeping from the shaft cavity 127, and greatly reducing the probability of motor oil leakage.

[0044] Furthermore, the end sleeve 4 includes a support sleeve 41, a rubber sleeve 42 and a sleeve shell 43. The rubber sleeve 42 is tightly mounted on the support sleeve 41, and the sleeve shell 43 is tightly mounted on the rubber sleeve 42. The sleeve shell 43 is arranged in the shaft cavity 127, and the rubber sleeve 42 is arranged between the support sleeve 41 and the sleeve shell 43. The friction between the support sleeve 41 and the sleeve shell 43 is increased to prevent the end sleeve 4 from being driven by the shaft, and at the same time, the sealing is increased to prevent the lubricating oil from flowing into the shaft cavity 127.

[0045] The upper end of the support sleeve 41 is provided with an annular support platform 41, the diameter of the annular support platform 41 is larger than the diameter of the shaft cavity 127, and is arranged above the shaft cavity 127, and is closely fitted with the bottom surface of the rotor cavity 125. In this way, the annular support platform 41 supports the rotor 2, realizes the interval setting of the rotor 2 and the bottom surface of the rotor cavity 125, avoids the wear of the bottom surface of the rotor cavity 125 by the rotation of the rotor 2, and further prevents the lubricating oil from flowing into the shaft cavity 127. The bottom end of the rubber sleeve 42 extends radially to form a fixed ring 42, the inner diameter of the fixed ring 42 is smaller than the inner diameter of the support sleeve 41, and the fixed ring 42 contacts the bottom of the support sleeve 41, and through its own friction, it is ensured that the rubber sleeve 42 will not shift. The port of the sleeve shell 43 is evenly opened with a plurality of notches 43, and the depth of the notches 43 is less than the height of the rubber sleeve 42. In this way, the disassembly and assembly of the support sleeve 41 and the rubber sleeve 42 are convenient.

[0046] The three-phase drainage motor for washing machines provided by the present invention has a plastic sealing part 14 to prevent water or humid air from entering the rotor cavity 125, which causes the arc surface of the inner ring 112 to rust. The rust tumors produced by the plastic sealing part 14 and the outer circle of the rotor 2 produce noise by friction. The gaps between the nine circular arc surfaces of the inner ring 112 of the iron core 11 of the stator 1 are filled with the plastic sealing part 14, which is an injection-molded whole with the wall surface of the rotor cavity 125, thereby enhancing the stability and strength of the inner wall of the rotor cavity 125. The sealing ring 32 ensures the sealing of the shaft hole 311 of the upper cover 3, and also ensures the airtightness of the rotor cavity 125 to more effectively prevent water from entering the motor shaft; the sealing ring 32 cooperates with the rotor cavity 125 to prevent the water flow that penetrates into the joint of the cover body 31 and the outer circle of the stator 1 from entering the cavity of the stator 1, thereby improving the waterproof performance of the overall motor. In addition, the end sleeve 4 is arranged between the rotating shaft of the rotor 2 and the rotating shaft cavity 127, thereby preventing the rotor 2 from wearing the side wall of the rotating shaft cavity 127, forming a lubricating oil storage space, and effectively preventing the possibility of lubricating oil leaking from the rotating shaft cavity 127, greatly reducing the probability of motor oil leakage. In this way, the three-phase drainage motor for a washing machine provided by the present invention avoids noise generated inside the motor through the arrangement of the plastic sealing part 14, the sealing ring 32 and the end sleeve 4, thereby extending the service life of the motor.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A three-phase drainage motor for a washing machine, characterized in that: It comprises a stator, a rotor and an upper cover, wherein the rotor is sealed inside the stator through the upper cover, the stator comprises an iron core, a coil skeleton, a three-phase coil and a plastic sealing part, the iron core comprises a wheel hub, an inner ring and teeth, the teeth radially connect the wheel hub and the inner ring, the inner ring is a nine-segment arc structure, the coil skeleton is coated on the teeth, the three-phase coil is wound on the coil skeleton, the plastic sealing part wraps the coil skeleton, the three-phase coil and the iron core to form a stopper, a rotor cavity and a shaft cavity, the stopper is above the rotor cavity, the shaft cavity is at the bottom of the rotor cavity, the plastic sealing part comprises an outer shell, a wall surface of the rotor cavity and a wall surface of the shaft cavity, the outer shell, the wall surface of the rotor cavity and the wall surface of the shaft cavity are integrally formed by injection molding, the rotor is provided with a three-pole permanent magnet and is installed in the rotor cavity, the shaft of the rotor passes through the upper cover, and the upper cover is detachably connected to the stator; The upper cover comprises a cover body and a sealing ring, the cover body is provided with an axial hole at its axial center, the cover body protrudes toward the stator direction to form a mounting cavity and a positioning ring, the mounting cavity and the positioning ring are coaxially arranged with the axial hole, and the diameter of the positioning ring is larger than the mounting cavity, the sealing ring is tightly matched with the rotor cavity, the sealing ring comprises an annular base plate, the annular base plate protrudes axially to form a mounting portion, the mounting portion is a cylinder and is coaxially arranged with the sealing ring, the mounting portion is sleeved on the rotating shaft of the rotor through a bearing, and the inner wall of the mounting portion is tightly matched with the bearing, the mounting portion is tightly embedded in the mounting cavity, and a positioning groove is also provided on the annular base plate, and the positioning ring is matched with the positioning groove; The lower part of the cover body is provided with a plurality of slots, the slots are evenly distributed around the axis on the outer peripheral surface of the cover body, and the upper part of the stator is provided with a plurality of blocks, the blocks are slidably engaged with the slots; The cover body protrudes in a direction away from the stator to form a concave cavity, and the concave cavity is coaxially arranged with the shaft hole; A plurality of reinforcing ribs are evenly arranged between the installation cavity and the positioning ring, and the reinforcing ribs are arranged along the radial direction of the upper cover. A platform is also arranged on the annular substrate, and a groove is formed between the platform and the installation portion, and the groove is engaged with the edge of the installation cavity. The platform cooperates with the reinforcing ribs. A retaining ring is also arranged on the outer periphery of the annular substrate, and the positioning groove is formed between the retaining ring and the platform. The positioning ring is a step structure, and the positioning ring is tightly matched with the positioning groove and the retaining ring. The outer wall of the retaining ring protrudes to form two sealing outer rings, and the sealing outer rings are arranged at intervals from each other; The outer wall of the bearing is recessed to form a sealing groove, the inner wall of the mounting portion is provided with a sealing inner ring that seals with the sealing groove, the cross-section of the sealing groove is rectangular, the cross-section of the sealing inner ring is semicircular, and the end of the mounting portion protrudes to form an annular sealing lip that tightly fits with the hole wall of the shaft hole.

2. The three-phase drain motor for a washing machine according to claim 1, characterized in that: The diameter of the rotor cavity is smaller than the diameter of the stop, the material of the plastic sealing part is BMC plastic, and the wall thickness of the plastic sealing part between the side wall surface of the rotor cavity and the nine circular arc surfaces of the inner ring of the iron core is less than 0.6 mm.

3. The three-phase drain motor for a washing machine according to claim 1, characterized in that: The shaft cavity is tightly embedded with an end sleeve, an oil storage cavity is formed inside the end sleeve, the rotor rear shaft extends into the oil storage cavity, the rotor rear shaft is movably arranged in the oil storage cavity, the inner hole of the end sleeve is arranged in contact with the outer diameter of the rotor rear shaft, and the end surface of the rotor rear shaft is spaced apart from the bottom surface of the oil storage cavity.

4. The three-phase drain motor for a washing machine according to claim 3, characterized in that: The end sleeve comprises a support sleeve, a rubber sleeve and a sleeve shell, wherein the rubber sleeve is tightly sleeved on the support sleeve, the sleeve shell is tightly sleeved on the rubber sleeve, and the sleeve shell is arranged in the rotating shaft cavity. An annular support platform is arranged at the upper end of the support sleeve, the diameter of which is larger than the diameter of the rotating shaft cavity, and the annular support platform is arranged above the rotor cavity and fits tightly with the bottom surface of the rotor cavity. The bottom end of the rubber sleeve radially extends to form a fixing ring, the inner diameter of the fixing ring is smaller than the inner diameter of the support sleeve, and a plurality of notches are evenly opened at the sleeve shell port, and the depth of the notches is smaller than the height of the rubber sleeve.

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