CN218888222U - Plastic package stator module of motor for dish washer circulating pump, motor and dish washer - Google Patents

Abstract

The utility model provides an aspect provides a plastic envelope stator module, including stator, plastic envelope shell, the plastic envelope shell uses the stator to form as the integrative formation of moulding plastics of inserts, the plastic envelope shell is roughly a cylinder, and the outer peripheral diameter D1 of this cylinder is big than stator core's yoke portion outer peripheral diameter D2, and the inner peripheral diameter D1 of this cylinder is big than the diameter D2 of the polar surface circular arc of stator core's pole shoe, the cylinder just is equipped with the axial that radial recessed formation link up the guide groove at cylinder both ends to the inner peripheral surface in clearance between every pole shoe of stator core, the outer peripheral surface top segment of cylinder is equipped with more than 2 fixture blocks that radial arch formed. The plastic package stator assembly is provided with guide grooves axially penetrating through two ends of the cylinder body, so that subsequent matching pieces can be conveniently guided to be sleeved in and radial and circumferential positions of the matching pieces can be conveniently limited, and the clamping blocks are arranged to be conveniently detachably connected with the matching pieces and limit axial positions of the matching pieces. The utility model also provides a motor and a dish washer.

Description

Plastic package stator module of motor for dish washer circulating pump, motor and dish washer

Technical Field

The utility model relates to a motor for dish washer circulating pump especially relates to the plastic envelope stator module of this motor, still relates to the dish washer that has this kind of motor, and IPC classification can belong to H02K 1/14, H02K 5/22, H02K 15/02, H02K 3/34, H02K5/128.

Background

European patent EP3613557B1 discloses an electric pump for a domestic appliance having a rotor housing, an impeller and an electric motor driving the impeller, wherein a stator of the electric motor is located outside a rotor cavity of the rotor housing and a permanent magnet rotor of the electric motor is rotatably mounted in the rotor cavity, a cylindrical jacket wall of the rotor cavity is arranged between the stator and the permanent magnet rotor, which jacket wall has an inner wall facing the permanent magnet rotor and an outer wall facing the stator, wherein a core of the stator is formed by a linear chain having a plurality of chain links, each bent into a circular ring after punching out of the linear chain, the connecting ends of the circular rings are welded fixed, forming a circular ring stator encapsulation, a coil body is formed by a plastic injection molding body formed by overmolding the circular ring stator encapsulation during a plastic injection molding process, a counter guide is arranged on the outer wall of the cylindrical jacket wall facing the stator, and a guide is formed on the coil body, which interacts with a corresponding counter guide to fix the stator at least radially to the outer wall of the jacket wall. There is a need for further improvements in the stator and assembly structure of the drive motor of the prior art electric pump to facilitate manufacture.

The general knowledge and terms can be found in the mechanical engineering handbook 2 nd edition of mechanical engineering publishers 1997, the motor engineering handbook, the mechanical industry publishers 2014 1 st edition of pump theory and technology, and the national standard GB/T7021 term for electric water pump.

Disclosure of Invention

Therefore, an object of the utility model is to provide a driving motor that is used for circulating pump water system of dish washer, the plastic envelope stator module that this motor was equipped with easily assembles and is connected reliably with the rotor shell of holding rotor subassembly.

An aspect of the utility model provides a plastic envelope stator module of motor for dish washer circulating pump, including stator, plastic envelope shell, the plastic envelope shell uses the stator to mould plastics as inserts an organic whole and forms, the stator includes annular stator core, insulating part and separates the terminal that insulating part coiling in a plurality of coils of stator core and be connected with the coil electrical contact, the plastic envelope shell is roughly a cylinder, and the outer peripheral diameter D1 of this cylinder is greater than stator core's yoke portion outer peripheral diameter D2, and the inner peripheral diameter D1 of this cylinder is greater than the diameter D2 of the polar surface circular arc of stator core's pole shoe, the cylinder just is equipped with the axial that radial recessed formation link up the guide way at cylinder both ends to the inner peripheral surface in clearance between every pole shoe of stator core, the outer peripheral surface top segment of cylinder is equipped with more than 2 fixture blocks that radial protruding formed.

The plastic package stator assembly is provided with guide grooves axially penetrating through two ends of the cylinder body, so that subsequent matching pieces can be conveniently guided to be sleeved in and radial and circumferential positions of the matching pieces can be conveniently limited, the clamping blocks are arranged, the detachable connection with the matching pieces can be conveniently realized, the axial positions of the matching pieces can be limited, and the assembly is simple and reliable. On one hand, the exposed pole shoes can keep a small working air gap with the rotor, and on the other hand, the diameter gap of the pole shoes can increase the radial depth of the guide groove, so that the displacement of the matching piece is limited, and the connection is firmer.

Further, the inner circumference diameter d1 of the cylindrical body is 0.5mm to 1.5mm larger than the diameter d2 of the pole face arc of the pole shoe of the stator core. The design ensures that the inner circumference of the cylinder body can be coated with the coil and the insulating piece, and the wall thickness is not too large, so that plastic package plastics are wasted.

Further, the distance L between the radial bottom surface of the guide groove and the inner peripheral surface of the cylinder is 0.5mm-1.5mm. The design avoids the problem that the service life is influenced by insufficient strength due to too high small-size bulge of a die for forming the guide groove by injection molding.

Further, the stator core is formed by a plurality of chain-type iron core pieces, the chain-type iron core pieces are laminated into a straight strip-shaped iron core after being stamped and formed, the insulating piece is arranged in a die by taking the straight strip-shaped iron core as an insert, and resin is injected into the die and is hardened to form the stator core. And the insulation piece is formed on the iron core by injection molding, and the insulation piece is firmly connected with the iron core, so that the assembly process is simplified, and the automatic production is facilitated.

The utility model discloses a second aspect provides a motor for dish washer circulating pump, including the rotor shell, the center of rotor shell has a cylindric rotor section of thick bamboo of injecing rotor chamber N, still include rotor subassembly, the rotor chamber lid subassembly and the outer seal ring of sealed rotor chamber N that rotatably install in rotor chamber N, still include any foretell plastic envelope stator module, this plastic envelope stator module cover is located the chamber wall periphery of rotor section of thick bamboo, the radial arch of the chamber wall periphery of rotor section of thick bamboo has the direction muscle, this direction muscle with the cooperation of guide slot is injecing plastic envelope stator module circumference and radial position; and the top section of the periphery of the rotor shell is provided with a buckle lug, and the buckle lug and the fixture block are matched to limit the axial position of the plastic package stator assembly.

The plastic package stator assembly of the motor is connected with the rotor shell by adopting a detachable buckle structure and is provided with a guide groove for guiding assembly, the guide groove is matched with the guide rib to limit the radial and circumferential positions, and the buckle lug is matched with the fixture block to limit the axial position, so that the motor is simple, firm and reliable in assembly.

Furthermore, the top end of the rotor cavity N extends radially outward to form an annular rotor casing fixing part, the outer edge of the rotor casing fixing part extends axially downward to form an annular rib, and the fastening lug extends downward at the lower end of the annular rib.

Furthermore, the inner wall of the annular rib is in clearance fit with the periphery of the plastic package stator assembly.

The inner wall of the annular rib is matched with the periphery of the plastic package stator assembly to further ensure the connection reliability of the plastic package stator assembly and the rotor shell.

Preferably, the rotor cavity cover assembly comprises a plastic upper cover provided with a central through hole, a bearing positioned in the through hole, a shaft seal and a sealing cover for limiting the axial position of the shaft seal, and the rotating shaft is rotatably supported in the bearing. The rotor cavity cover assembly structure can be penetrated by the rotating shaft in a rotating way, and washing water can be prevented from entering the rotor cavity.

The third aspect of the utility model provides a dish washing machine, including flourishing water tank, install in the foretell motor of flourishing water tank bottom lower extreme is fixed in the impeller on pivot top, with the motor with the axle center install in flourishing water tank bottom upper end, the holding impeller is equipped with water inlet through hole's water conservancy diversion subassembly, with water conservancy diversion subassembly fixed connection and be equipped with the spray assembly of rivers export.

When the water containing tank body of the dish washing machine has water, the impeller rotates to drive the water to enter the inner cavity of the flow guide assembly from the radial through hole at the lower part of the flow guide assembly, the water is thrown out to the spray assembly at the upper part of the impeller and then is sprayed out from the pressure relief hole on the spray assembly, and the water circulating pump function of the dish washing machine is realized.

The technical solution and effects of the present invention will be further described in the detailed description with reference to the accompanying drawings.

Drawings

Fig. 1 is an exploded view of a motor according to an embodiment of the present invention;

fig. 2 is an axial sectional view of a motor according to an embodiment of the present invention;

FIG. 2-1 is an enlarged view of a portion of FIG. 2 at A;

fig. 3 is a radial cross-sectional view of an electric machine according to an embodiment of the present invention;

FIG. 3-1 is an enlarged view of a portion of FIG. 3 at B;

fig. 4 is a schematic perspective view of a plastic package stator assembly according to an embodiment of the present invention;

fig. 5 is a bottom view of the plastic package stator assembly according to the embodiment of the present invention;

fig. 6 is a radial cross-sectional view of a plastic package stator assembly according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a stator according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of a straight iron core according to an embodiment of the present invention;

fig. 9 is a schematic perspective view of the embodiment of the present invention, in which the straight strip-shaped iron core is integrally injection molded to form the insulator;

fig. 10 is a schematic perspective view of a rotor case according to an embodiment of the present invention;

fig. 11 is an axial sectional view of a rotor case according to an embodiment of the present invention;

fig. 12 is a schematic perspective view of a circulating pump water spraying system of a dishwasher according to an embodiment of the present invention.

Reference numerals

The motor 10, the rotor housing 11, the rotor cavity N, the rotor barrel 111, the guide rib 1111, the rotor housing fixing portion 112, the mounting post 113, the mounting hole 114, the annular rib 115, the snap tab 116, the bayonet 117, the rotor assembly 12, the rotating shaft 121, the permanent magnet rotor 122, the plastic encapsulated stator assembly 13, the stator 131, the stator core 1311, the insulating member 1312, the coil 1313, the terminal 1314, the plastic encapsulated housing 132, the bottom 1321, the barrel 1322, the top 1323, the terminal sealing portion 1324, the guide slot 1325, the clamping block 1326, the rotor cavity cover assembly 14, the plastic upper cover 141, the central through hole 1411, the bearing 142, the shaft seal 143, the sealing cover 144, the outer sealing ring 15, the water containing tank 201, the impeller 202, the flow guide assembly 203, and the spray assembly 204.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

It is to be understood that the directional terms upper, lower, inner, outer, upward, downward, inward, outward, etc. used in the description are intended in the description of the orientations shown in the figures and are not intended to be limiting. Unless specifically stated otherwise, the terms inward, outward, inboard, outboard herein refer to ranges relative to the center of the component, e.g., with reference to the motor axis, inward and inboard refer to positions or orientations closer to or pointing toward the motor axis, and outward and outboard refer to locations further from the motor center axis; further with reference to the impeller position, upper and upper sides refer to positions or orientations closer to or pointing toward the impeller, and lower sides refer to positions or orientations further from the impeller. Furthermore, the terms horizontal, upright, suspended, etc. do not imply that the components are absolutely horizontal or suspended, but are allowed to tilt somewhat. Such as horizontal simply means that its direction is more horizontal than vertical, and does not mean that the structure is perfectly horizontal, but may be slightly inclined.

The motor 10 for the dishwasher circulating pump as shown in fig. 1-3 has a rotor housing 11 defining a rotor cavity N, a rotatable rotor assembly 12 accommodated in the rotor cavity N, a plastic-encapsulated stator assembly 13 sleeved on an outer wall of the rotor cavity, a rotor cavity cover assembly 14 closing the rotor cavity N, and an outer seal ring 15 disposed on an upper end surface of the rotor housing 11 and surrounding the rotor cavity N. The rotor assembly 12 includes a rotating shaft 121 and a permanent magnet rotor 122 fixedly connected to the rotating shaft 121.

(Plastic packaging stator assembly 13)

As shown in fig. 4-6, the plastic molded stator assembly 13 includes a stator 131 and a plastic molded shell 132. In the present embodiment, the stator 131 is disposed in a mold, and a resin is injected into the mold and cured to form the mold 132. That is, the plastic capsule 132 is integrally injection-molded by using the stator 131 as an insert.

As shown in fig. 7, stator 131 includes a ring-shaped stator core 1311, a plurality of coils 1313 wound around stator core 1311 with an insulator 1312 interposed therebetween, and terminals 1314 electrically connected to coils 1313, in which coils 1313 are arranged in a ring shape with their center holes oriented in the radial direction, and terminals 1314 are provided at the lower end of insulator 1312 and on the outer peripheries of coils 1313 and stator core 1311.

As shown in fig. 8 to 9, the stator core 1311 is formed of a plurality of chain-type iron core pieces, which are pressed and laminated into a straight bar-shaped core after press forming, and the insulating member 1312 of the present embodiment is disposed in a mold with the straight bar-shaped core as an insert, and is formed by injecting resin into the mold and hardening the resin. Then, coil 1313 is wound around insulator 1312, a straight iron core having insulator 1312 and coil 1313 is wound into a circle, the two ends after forming are connected by welding, and terminal 1314 is provided at the lower end of insulator 1312 to be electrically connected to each phase coil, respectively, to form stator 131 shown in fig. 7, and the common ends of each phase coil of stator 131 are welded together or connected by the same terminal. In other embodiments, there is a production process of rolling the strip-shaped iron core having the insulating member 1312 and then winding the coil 1313 around the insulating member 1312.

Further, as shown in fig. 2, 4, and 5, the molded case 132 is a cylindrical body including an annular bottom 1321 covering the coil 1313, the insulator 1312, and the stator core 1311 from below; a cylindrical portion 1322 extending upward from the bottom portion 1321; an annular top portion 1323 that covers the coil 1313, the insulator 1312, and the stator core 1311 from above; and a terminal sealing portion 1324 protruding from the outer periphery of the barrel portion 1322, the terminal sealing portion 1324 covering a connection portion between the terminal 1314 and the coil 1313 and exposing a connection portion between the terminal 1314 and an external power supply. The mold 132 covers the coil 1313, the insulating member 1312, and the stator core 1311 except for the pole pieces, that is, the inner surface of the cylindrical portion 1322 of the mold 132 exposes the end faces of the pole pieces and the pole faces of the pole pieces of the stator core 1311.

Further, as shown in fig. 6, the outer circumferential diameter D1 of the cylindrical portion 1322 of the mold casing 132 is larger than the yoke diameter D2 of the stator core 1311; as shown in fig. 5, the inner circumferential diameter d1 of the cylindrical portion 1322 of the mold cover 132 is larger than the pole face diameter d2 of the pole piece of the stator core 1311, and therefore, part of the pole piece end face and the pole face of the stator core 1311 are exposed to the inner circumferential surface of the cylindrical portion 1322. Preferably, d1 is 0.5mm to 1.5mm greater than d 2. Further, the inner surface of the cylinder portion 1322 between each pole piece is radially recessed to form a guide groove 1325 penetrating the bottom portion 1321 and the top portion 1323, and the distance L between the radial bottom portion of the guide groove 1325 and the inner surface of the cylinder portion 1322 is 0.5mm to 1.5mm. Thus, the guide slot 1325 has shallow groove depths at the upper end and the lower end of the inner periphery of the cylinder part 1322, deep groove depths between the pole shoes, the shallow parts at the two ends of the guide slot 1325 play a role in guiding, the whole section can play a role in limiting, and the structural strength of the limiting part is good. As shown in fig. 4, the cylindrical portion 1322 of the plastic capsule 132 is formed with blocks 1326 radially protruding from the outer periphery thereof adjacent to the top portion 1323 thereof, and preferably, more than 2 blocks 1326 are uniformly distributed in the circumferential direction.

The encapsulating member 132 is preferably injection molded from Bulk Molding Compound (BMC).

(rotor case 11)

As shown in fig. 10 and 11, the rotor housing 11 has a cylindrical rotor cylinder 111 at the center thereof defining a rotor cavity N, the rotor cylinder 111 having an inner wall facing the rotor assembly 12 and an outer wall facing the plastic encapsulated stator assembly 13, and guide ribs 1111 are radially protruded on the outer wall, and preferably, the number of the guide ribs 1111 is the same as the number of the guide grooves 1325 of the plastic encapsulated stator assembly 13. Radial outside extension forms annular rotor shell fixed part 112 in the top of rotor chamber N, rotor shell fixed part 112 terminal surface axial protrusion has several erection column 113, erection column 113 center is equipped with mounting hole 114, rotor shell fixed part 112's outer fringe axial downwardly extending forms an annular muscle 115, clearance fit is adopted with plastic envelope stator module 13 outer peripheral face to the inner wall surface of annular muscle 115, annular muscle 115's lower extreme axial extension arch has more than 2 a buckle ear 116, the bayonet 117 that the trompil formed on the buckle ear.

(rotor assembly 12)

As shown in fig. 2, the rotor assembly 12 accommodated in the rotor chamber N includes a rotating shaft 121 and an injection molded permanent magnet rotor 122 fixed to the rotating shaft 121. In other embodiments, the permanent magnet rotor may be formed by placing several permanent magnet blocks and the shaft 121 in an injection mold and overmolding with an injected plastic material, particularly a thermoplastic.

(rotor cavity cover assembly 14)

As shown in fig. 2, the rotor chamber cover assembly 14 includes a plastic upper cover 141 having a central through hole 1411, and a bearing 142 located in the through hole and penetrated by the rotating shaft 121, a shaft seal 143, and a cover 144 for limiting the shaft seal 143, wherein the bearing 143 rotatably supports the rotating shaft 121 of the rotor assembly, and the shaft seal 143 prevents wash water from penetrating into the rotor chamber N through the central through hole 1411.

Above-mentioned each subassembly assembly forms the utility model discloses a motor 10, its cooperation relation is as shown in fig. 2, 3, and plastic envelope stator module 13 cover is established and is fixed in rotor shell 11's rotor section of thick bamboo 111 outer wall, and wherein guide slot 1325 and annular muscle 111 cooperation are injectd plastic envelope stator module 13 circumference and radial position, and the axial displacement of plastic envelope stator module 13 is injectd in fixture block 1326 and the bayonet 117 cooperation of detaining ear 116. The outer sealing ring 15 is provided with a mounting hole which is sleeved with the mounting column 113 and then limited on the upper end surface of the rotor shell fixing part 112, the plastic upper cover 141 of the rotor cavity cover component 14 is buckled with the rotor cavity N to fixedly seal the rotor cavity N, and the inner side of the outer sealing ring 15 is pressed at the same time, so that the washing water is prevented from permeating into the rotor cavity N from the outer edge of the plastic upper cover 141. The rotor assembly 12 is received in the rotor cavity N with its shaft 121 supported by the bearing 142 of the rotor cavity cover assembly 14 and extending out of the rotor cavity N through the rotor cavity cover assembly 14.

(dishwasher)

As shown in fig. 12, the utility model discloses a dishwasher is equipped with water containing tank 201, and motor 10 is fixed in water containing tank 201's bottom, and water containing tank 201's bottom is equipped with the mounting hole 114 of through-hole and rotor shell fixed part 112 that is equipped with its lower extreme and adopts the screw spiro union fixed, and water containing tank 201's bottom compresses tightly the lip of external seal up end simultaneously, avoids the washing water to spill over to water containing tank 201 outside. The upper end of the bottom of the water containing tank 201 is also provided with a cylindrical flow guide assembly 203 which is coaxial with the motor 10, the top section of a rotating shaft 121 of the motor is fixed with an impeller 202, the flow guide assembly 203 is concentric with the impeller 202 and accommodates the impeller 202 in a cylindrical inner cavity, the lower section of the inner cavity is provided with a plurality of radial through holes, liquid is guided into the inner cavity from the water containing tank 201, and the vertically-raised liquid is guided to the horizontal direction by the impeller 202. The flow guide assembly 203 can be screwed and fixed with the mounting hole 114 together with the through hole at the bottom of the water containing tank 201, or can be independently fixed at the bottom of the water containing tank 201 or the rotor housing fixing part 112. The outer surface of the upper section of the cylinder body of the flow guide assembly 203 extends outwards in the radial direction to form a platform surface, and a spraying assembly 204 is fixed on the platform surface. After water is filled into the water containing tank of the dishwasher, the bottom of the water containing tank is used as a partition, the impeller 202 on the bottom is positioned in water, when the dishwasher is operated, the impeller 202 rotates to drive water to enter the inner cavity of the flow guide assembly from the radial through hole on the lower part of the flow guide assembly, the water is thrown out of the upper part of the impeller 202 to the spray assembly 204, and then the water is sprayed out from the pressure relief hole on the spray assembly 204, so that the water circulating pumping function of the dishwasher is realized.

The above embodiments and design examples only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention.

Claims (9)

1. The plastic package stator assembly (13) of the motor for the dishwasher circulating pump comprises a stator (131) and a plastic package shell (132), wherein the plastic package shell (132) is formed by integrally injection molding by taking the stator (131) as an insert, the stator (131) comprises an annular stator core (1311), an insulating member (1312), a plurality of coils (1313) wound on the stator core through the insulating member (1312) and terminals (1314) connected with the coils (1313), and the plastic package stator assembly is characterized in that the plastic package shell (132) is approximately a cylinder, the outer peripheral diameter D1 of the cylinder is larger than the outer peripheral diameter D2 of a yoke part of the stator core (1311), the inner peripheral diameter D1 of the cylinder is larger than the diameter D2 of a circular arc cylinder of a pole surface of a pole shoe of the stator core (1311), a guide groove (1325) which is formed by radial sinking and penetrates through two ends in the axial direction is arranged on the inner peripheral surface of a gap between every pole shoes of the stator core (1311), and more than 2 fixture blocks (1326) formed by radial protruding are arranged on the top section of the outer peripheral surface of one end.

2. A plastic encapsulated stator assembly (13) according to claim 1, characterized in that the inner circumference diameter d1 of said cylindrical body is 0.5mm-1.5mm larger than the diameter d2 of the pole face arc of the pole shoe of said stator core (1311).

3. The plastic package stator assembly (13) according to claim 1, wherein a distance L between a radial bottom surface of the guide groove (1325) and an inner circumferential surface of the cylinder is 0.5mm to 1.5mm.

4. A plastic encapsulated stator assembly (13) as claimed in claim 1, wherein said stator core (1311) is formed of a plurality of chain-type core pieces, said chain-type core pieces being laminated into a straight bar-shaped core after being press-formed, the insulating member (1312) being disposed in a mold with said straight bar-shaped core as an insert, and being formed by injecting resin into said mold and hardening it.

5. A motor for a dishwasher circulating pump comprises a rotor shell (11), wherein a cylindrical rotor barrel (111) for limiting a rotor cavity N is arranged in the center of the rotor shell (11), the motor further comprises a rotor assembly (12) rotatably installed in the rotor cavity N, a rotor cavity cover assembly (14) for sealing the rotor cavity N and an outer sealing ring (15), and the motor is characterized by further comprising a plastic package stator assembly (13) according to any one of claims 1 to 4, the plastic package stator assembly (13) is sleeved on the periphery of the cavity wall of the rotor barrel (111), a guide rib (1111) is protruded radially on the periphery of the cavity wall of the rotor barrel (111), and the guide rib (1111) and a guide groove (1325) are matched to limit the circumferential and radial positions of the plastic package stator assembly (13); the outer circumference top segment of rotor shell (11) is equipped with buckle ear (116), the axial position of plastic envelope stator module (13) is injectd in buckle ear (116) and fixture block (1326) cooperation.

6. The motor for a dishwasher circulation pump according to claim 5, wherein the top end of the rotor chamber N is formed with an annular rotor housing fixing portion 112 extending radially outwardly, the outer edge of the rotor housing fixing portion 112 is formed with an annular rib 115 extending axially downwardly, and the fastening lug 116 is formed at the lower end of the annular rib 115 extending downwardly.

7. The motor for the dishwasher circulation pump according to claim 6, wherein the inner wall of the annular rib (115) is in clearance fit with the outer periphery of the plastic-encapsulated stator assembly (13).

8. The motor for a dishwasher circulation pump according to claim 5, wherein said rotor chamber cover assembly (14) comprises a plastic upper cover (141) provided with a central through hole (1411) and a bearing (142) located in said through hole (1411), a shaft seal (143) and a cover (144) defining an axial position of the shaft seal, the rotary shaft (121) of said rotor assembly (12) being rotatably supported in the bearing (142).

9. A dishwasher, comprising a water tank (201), characterized by further comprising a motor for a circulation pump of the dishwasher of any one of claims 5 to 8 installed at the lower end of the bottom of the water tank, an impeller (202) fixed at the top end of a rotating shaft (121) of the rotor assembly (12), a flow guide assembly (203) coaxially installed with the motor at the upper end of the bottom of the water tank, accommodating the impeller (202) and provided with a water inlet through hole, and a spray assembly (204) fixedly connected with the flow guide assembly (203) and provided with a water outlet.

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