CN113279969A

CN113279969A - Double-water-path open type dish washing machine water pump assembly

Info

Publication number: CN113279969A
Application number: CN202110558692.1A
Authority: CN
Inventors: 王永勇; 陈强飞; 周建
Original assignee: Ningbo Jinling Kitchen Equipment Co ltd
Current assignee: Ningbo Jinling Kitchen Equipment Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-08-20

Abstract

The invention discloses a double-water-path open type dish washing machine water pump assembly which comprises an impeller, a volute and a motor, wherein the motor drives the impeller to rotate in the volute; the impeller comprises a central shaft, an inner ring blade connected to the central shaft and an outer ring blade coaxially connected to the periphery of the inner ring blade, the volute is provided with an inner ring pump chamber matched with the inner ring blade and an outer ring pump chamber matched with the outer ring blade, the inner ring pump chamber and the outer ring pump chamber are arranged in an isolated mode, the bottom of the volute is provided with an inner ring water inlet communicated with the inner ring pump chamber and an outer ring water inlet communicated with the outer ring pump chamber, the top of the volute is provided with an inner ring water outlet communicated with the inner ring pump chamber, the lateral part of the volute is provided with an outer ring water outlet communicated with the outer ring pump chamber, the inner ring blade and the inner ring pump chamber are matched to pump cleaning water to the spraying device arranged at the bottom of the water tank body, the outer ring blade and the outer ring pump chamber are matched to pump cleaning water to the spraying device arranged in other directions of the water tank body, the design structure is compact, the cost is reduced, and the assembly is convenient.

Description

Double-water-path open type dish washing machine water pump assembly

Technical Field

The invention relates to the technical field of dish washing machines, in particular to a double-water-path open type dish washing machine water pump assembly.

Background

The inside washing water that adopts the recycling of dish washer, set up filter equipment and basin usually in the bottom of dish washer inner bag, the washing water that the spray arm sprayed enters into the basin so that cyclic utilization through filter equipment to reach the water conservation purpose. The water pump assembly of the existing dishwasher includes a washing pump for spraying the washing water in the water tank to the inner tub of the dishwasher through a spray arm to wash dishes, and a drain pump for draining the washing water in the water tank.

The existing dish washer is only provided with the lower spraying device at the bottom of the water tank body, so that the dish washer is low in cleaning efficiency and relatively common in cleaning quality, in order to solve the problems, a spraying structure is generally additionally arranged in other directions of the dish washer, for example, the upper spraying device is additionally arranged at the top of the dish washer, but the additionally arranged upper spraying device needs to be provided with a power pump independently so as to pump cleaning water at the bottom of the water tank body into the upper spraying device, so that the dish washer is high in cost, and meanwhile, the power pump is additionally arranged independently, so that more space is occupied, the internal structure of the dish washer is complicated, the assembly is inconvenient, and the dish washer is not favorable for popularization in the market; or a power pump is adopted, and the output waterway of the power pump is divided into two paths of water outlets, and the structure can not achieve higher pressure due to the fact that water pressure can not reach the higher pressure after the two paths of water outlets.

The existing dishwasher water pump can also refer to an open type water pump disclosed in CN201310750285.6, the open type water pump is suspended at the bottom of the water tank and is limited with a water inlet located below or at the side of the bracket and a water outlet extending into the spray arm, the open type water pump is essentially formed by combining a lower-stage axial flow pump and an upper-stage centrifugal pump, the axial flow pump is used for drawing water upwards by utilizing an axial flow bending section of the impeller, the centrifugal pump is used for centrifugally throwing cleaning water on the axial flow pump, and meanwhile, negative pressure is formed at the centrifugal pump to further draw water from the water inlet. The open type water pump is only provided with one water outlet extending into the spray arm, so that the second water outlet can not be separated to supply water to the double spray arms, and if other spray arms are arranged in the water tank of the dishwasher, a separate power pump needs to be additionally arranged.

Disclosure of Invention

The invention aims to provide a double-water-path open type dishwasher water pump assembly, which is characterized in that cleaning water is pumped to a spraying device arranged at the bottom of a water tank body through the matching of an inner ring blade and an inner ring pump chamber, the cleaning water is pumped to the spraying devices arranged in other directions of the water tank body through the matching of an outer ring blade and an outer ring pump chamber, a power pump is not required to be arranged independently, the design structure is compact, the cost is reduced, and the assembly is convenient.

The technical purpose of the invention is realized by the following technical scheme: a double-water-path open type dishwasher pump assembly comprises an impeller, a volute and a motor, wherein the motor drives the impeller to rotate in the volute; the impeller comprises a central shaft, inner ring blades connected to the central shaft and outer ring blades coaxially connected to the peripheries of the inner ring blades, the volute is provided with an inner ring pump chamber matched with the inner ring blades and an outer ring pump chamber matched with the outer ring blades, the inner ring pump chamber and the outer ring pump chamber are arranged in an isolated mode, the bottom of the volute is provided with an inner ring water inlet communicated with the inner ring pump chamber and an outer ring water inlet communicated with the outer ring pump chamber, the top of the volute is provided with an inner ring water outlet communicated with the inner ring pump chamber, and the side of the volute is provided with an outer ring water outlet communicated with the outer ring pump chamber.

Further, the impeller is provided with an annular connecting wall, the inner ring blades are connected to the inner side of the annular connecting wall, and the outer ring blades are connected to the outer side of the annular connecting wall.

Further, the volute comprises an upper volute and a lower volute, and the upper volute is arranged above the lower volute; the upper volute is provided with an inner annular wall corresponding to the annular connecting wall, and the inner side of the inner annular wall and the inner side of the annular connecting wall form the inner ring pump chamber; the upper volute, the lower volute, the inner ring wall and the annular connecting wall are surrounded to form the outer ring pump chamber.

Furthermore, the volute also comprises a volute bottom arranged between the upper volute and the lower volute, and the upper volute, the lower volute, the volute bottom and the annular connecting wall are enclosed to form the outer ring pump chamber.

Furthermore, a water diversion ring corresponding to the annular connecting wall is arranged below the volute, the water diversion ring is used for dividing the lower part of the volute into two water drawing areas, one water drawing area is communicated with the inner ring pump chamber through the inner ring water inlet, and the other water drawing area is communicated with the outer ring pump chamber through the outer ring water inlet.

Further, still include the basin body, the water distribution ring is equipped with and is used for installing the mounting hole of motor fixed mounting in basin body below and is used for installing the installation guide pillar of spiral case fixed mounting in basin body bottom.

Furthermore, the side of the volute is provided with a water outlet pipeline, the outer ring water outlet is communicated with a liquid outlet of the water outlet pipeline, and the liquid outlet of the water outlet pipeline discharges liquid upwards, downwards or towards the side.

Furthermore, the upper part of the outer ring blade is provided with an upper water retaining ring, and the inner end of the upper water retaining ring extends to the annular connecting wall.

Furthermore, the periphery of the bottom of the outer ring blade is provided with a lower water retaining ring in clearance fit with the volute, and the outer ring water inlet is positioned between the lower water retaining ring and the annular connecting wall.

Further, the bottom of outer lane blade is equipped with axial compressor bending section.

In conclusion, the invention has the following beneficial effects:

a double-water-path open type dishwasher water pump assembly is characterized in that a power assembly drives an impeller to rotate, an inner ring blade sucks cleaning water in a water tank body into an inner ring water inlet, and the cleaning water is pumped to a spraying device arranged at the bottom of the water tank body from an inner ring water outlet through an inner ring pump chamber to be sprayed by the spraying device; simultaneously, the outer ring blades suck cleaning water in the water tank body into an outer ring water inlet, the cleaning water is pumped to other spraying devices from an outer ring water outlet through an outer ring pump chamber, the spraying devices are preferably arranged at the top of the dish washing machine and used for spraying, and then a power pump is not required to be independently arranged.

Drawings

Fig. 1 is an overall schematic view of the outlet conduit of the present invention when the outlet is disposed sideways.

Fig. 2 is an exploded view of the outlet port of the outlet conduit of the present invention positioned sideways.

Fig. 3 is an overall schematic view of the outlet conduit of the present invention as it is disposed toward the upper end.

Fig. 4 is a cross-sectional view of the present invention.

Fig. 5 is an enlarged view of the invention at a.

Fig. 6 is an exploded view of the combination of the present invention with a dishwasher sump body and a lower spray device.

Fig. 7 is a schematic view of the outlet conduit of the present invention with the outlet port facing downward.

Fig. 8 is a schematic view of the overall structure of the present invention.

Fig. 9 is a schematic view of an impeller provided with an upper water deflector ring according to the present invention.

Fig. 10 is a schematic view of an impeller of the present invention without an upper water deflector ring.

FIG. 11 is a schematic view of the lower volute with the outlet conduit down according to the present invention.

In the figure: 1. an impeller; 11. a central shaft; 12. an annular connecting wall; 13. an inner ring blade; 14. an outer ring blade; 141. an upper water retaining ring; 142. a lower water retaining ring; 15. an upper impeller portion; 16. a lower impeller portion; 2. a volute; 21. an upper volute; 211. an inner annular wall; 22. a lower volute; 221. a curved surface; 23. an inner ring pump chamber; 231. an inner ring water inlet; 232. a water outlet of the inner ring; 24. an outer ring pump chamber; 241. a water inlet of the outer ring; 242. a water outlet of the outer ring; 25. a volute bottom; 26. a water diversion ring; 261. mounting holes; 262. mounting a guide pillar; 27. a water outlet pipeline; 28. a connecting pipe; 3. a motor; 31. a protective shell; 32. a seal ring; 4. a sink body; 41. a circulating water holding area; 5. a spray arm; 51. a spray arm fixing ring; 52. a nozzle; 53. and (4) a spraying flow channel.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 11, a double-water-path open type dishwasher water pump assembly includes an impeller 1, a volute 2, a motor 3, the motor 3 drives the impeller 1 to rotate in the volute 2, the dishwasher water pump assembly further includes a water tank body 4, the bottom of the water tank body 4 includes a circulating water containing area 41, a filter device (not shown in the figure) is covered on the circulating water containing area 41, a protective shell 31 for accommodating the motor 3 is fixedly installed at a position of the lower end of the water tank body 4 corresponding to the circulating water containing area 41, and a sealing ring 32 is arranged between an output end of the motor 3 and the protective shell 31 to prevent washing water from invading into the motor 3.

The impeller 1 comprises a central shaft 11, inner ring blades 13 connected to the central shaft 11 and outer ring blades 14 coaxially connected to the peripheries of the inner ring blades 13, the volute 2 is provided with an inner ring pump chamber 23 matched with the inner ring blades 13 and an outer ring pump chamber 24 matched with the outer ring blades 14, the inner ring pump chamber 23 and the outer ring pump chamber 24 are arranged in a separated mode, the bottom of the volute 2 is provided with an inner ring water inlet 231 communicated with the inner ring pump chamber 23 and an outer ring water inlet 241 communicated with the outer ring pump chamber 24, the top of the volute 2 is provided with an inner ring water outlet 232 communicated with the inner ring pump chamber 23, the side of the volute 2 is provided with an outer ring water outlet 242 communicated with the outer ring pump chamber 24, the central shaft 11 is of a hollow structure, and the output end of the motor 3 extends into the hollow structure and is fixedly connected with the central shaft 11 so that the motor 3 drives the impeller 1 to rotate to draw water.

Impeller 1 is equipped with cyclic annular connecting wall 12, and inner circle blade 13 is connected in the inboard of cyclic annular connecting wall 12, and outer lane blade 14 is connected in the outside of cyclic annular connecting wall 12, through setting up cyclic annular connecting wall 12 for this impeller 1's structure is more stable, and intensity is higher, and cyclic annular connecting wall 12 has still increased the quality of impeller 1 lower extreme, prevents that impeller 1 wheel from causing the output shaft of motor 3 crooked because of weighing down.

The volute 2 comprises an upper volute 21 and a lower volute 22, and the upper volute 21 is arranged above the lower volute 22; the upper volute casing 21 is provided with an inner ring wall 211 corresponding to the annular connecting wall 12, and the inner side of the inner ring wall 211 and the inner side of the annular connecting wall 12 form the inner ring pump chamber 23; the upper volute 21, the lower volute 22, the inner annular wall 211 and the annular connecting wall 12 surround and form the outer ring pump chamber 24, specifically, the inner annular wall 211 extends in the direction of the annular connecting wall 12 and is in clearance fit with the annular connecting wall 12, the distance of the clearance ensures that the annular connecting wall 12 does not interfere with the inner annular wall 211 during rotation, and the distance of the clearance ensures that the cleaning water in the inner ring pump chamber 23 and the cleaning water in the outer ring pump chamber 24 do not interfere during respective pumping.

The volute 2 further comprises a volute bottom 25 arranged between the upper volute 21 and the lower volute 22, the upper volute 21, the lower volute 22, the volute bottom 25 and the annular connecting wall 12 are surrounded to form the outer ring pump chamber 24, the upper volute 21 and the volute bottom 25 are fixed in advance through screws, a water path of the outer ring pump chamber 24 is guaranteed to be smooth, and meanwhile, the space of the outer ring pump chamber 24 is reduced, so that the pumping efficiency of the outer ring pump chamber 24 is improved.

A water diversion ring 26 corresponding to the annular connecting wall 12 is arranged below the volute 2, the water diversion ring 26 is used for dividing the lower part of the volute 2 into two water drawing areas, one water drawing area is communicated with the inner ring pump chamber 23 through an inner ring water inlet 231, the other water drawing area is communicated with the outer ring pump chamber 24 through an outer ring water inlet 241, the water diversion ring 26 is provided with a mounting hole 261 for fixedly mounting the motor 3 below the water tank body 4 and a mounting guide pillar 262 for fixedly mounting the volute 2 at the bottom of the water tank body 4, specifically, the inner end of the water diversion ring 26 extends to the annular connecting wall 12 and has a gap with the annular connecting wall 12, the water diversion ring 26 fixes the motor 3 and the bottom of the inner container together through screws in advance, the upper volute 21 fixes the lower volute 22 on the guide pillar of the water diversion ring 26 through screws, and divides water at the bottom of the volute 2 into two ways up and down through the water, the water quantity is evenly distributed.

The bottom of the outer ring blade 14 is provided with an axial flow bending section, specifically, the outer ring blade 14 is radially distributed on the periphery of the annular connecting wall 12, and the outer ring blade 14 is bent along the rotation direction of the central shaft 11, so that the inner ring blade 13 and the outer ring blade 14 can draw water at a low position, and can draw sufficient flow from the inner ring water inlet 231 and the outer ring water inlet 241, so that the water drawing effect is better.

The lowermost end of the outer ring of blades 14 is higher than the lowermost end of the inner ring of blades 13, although the lowermost end of the inner ring of blades 13 may also be located between the uppermost end of the outer ring of blades 14 and the lowermost end of the outer ring of blades 14.

The invention specifically describes that the lower spray device and the upper spray device are arranged in the dishwasher, the lower spray device comprises a spray arm 5 and a spray arm fixing ring 51, the spray arm fixing ring 51 is rotatably connected to an upper volute 21, the spray arm 5 is fixedly connected with the spray arm fixing ring 51, so that the spray arm 5 is rotatably connected to the upper volute 21, the spray arm is provided with a plurality of nozzles 52, the nozzles 52 are arranged in different directions, the upper spray device comprises an upper spray arm 5 and a lower spray arm 5 which are detachably connected, the upper spray arm 5 and the lower spray arm 5 are provided with a spray flow passage 53 communicated with the nozzles 52, the spray flow passage 53 is communicated with an inner ring water outlet 232, specifically, the lower spray arm is in clearance fit with the upper volute 21, so that all or most of cleaning water pumped from the inner ring water outlet 232 enters the spray flow channel 53, the motor 3 drives the impeller 1 to rotate, the cleaning water in the circulating water containing area is pumped into the spray flow channel 53 and sprayed out from the nozzle 52 for washing, meanwhile, the cleaning water drives the spray arm to rotate on the upper volute 21 under the action of centrifugal force, and finally the cleaning water flows back to the circulating water containing area 41 after being filtered by the filter device.

A water outlet pipeline 27 is arranged beside the volute 2, the outer ring water outlet 242 is communicated with a liquid outlet of the water outlet pipeline 27, a liquid outlet of the water outlet pipeline 27 discharges liquid upwards, downwards or towards the side,

when the liquid outlet of the water outlet pipe 27 of the volute 2 discharges liquid towards the side edge, as shown in fig. 1-2, the water outlet pipe 27 is bent along the rotation direction of the impeller 1, specifically, the water outlet pipe 27 is connected to the upper spraying device through the connecting pipe 28, both the water outlet pipe 27 and the connecting pipe 28 are located inside the water tank body 4, and specifically, the water outlet pipe and the connecting pipe can be fixedly installed on the inner side wall of the water tank body 4.

The outlet pipe 7 is bent and extended along the same height of the volute 2 to enable the outer ring liquid outlet 131 to discharge liquid towards the side edge, that is, the liquid outlet of the outlet pipe 27 is as shown in fig. 1-2, when the liquid outlet of the outlet pipe 27 of the volute 2 discharges liquid towards the upper end, as shown in fig. 3, the connecting pipe 28 is connected with the water pipe 27, so that the washing liquid discharged from the liquid outlet is supplied upwards to the upper spraying device through the connecting pipe 28, and in the two technical solutions, the connecting pipe 28 is located inside the water tank body 4, that is, does not pass through the lower part of the water tank body 4.

When the liquid outlet of the outlet pipe 27 of the volute 2 discharges liquid towards the lower end, as shown in fig. 6, 7, 8, and 11, the outlet pipe 27 passes through the bottom of the water tank body 4 and is connected to the upper spraying device through the connecting pipe 28 located at the lower end of the water tank body 4, the connecting pipe is located outside the water tank body 4, the structure is located inside the water tank body 4 relative to the structure in which the outlet pipe 27 and the connecting pipe are both located inside the water tank body 4, the cleaning quality of the upper spraying device is general, and in order to prevent the cleaning water in the outer-ring pump chamber 24 from falling in the flow, the outer-ring water flow surface of the lower volute 22 is set to be a gradually-changing curved surface 221 from high to low along the rotation direction of the outer-ring blades 14, so that the cleaning water is discharged along the outer-ring water outlet 242, thereby facilitating the pressurization of the cleaning water in the outer-ring pump chamber 24 and improving the pumping efficiency.

The upper part of the outer ring blade 14 is provided with an upper water retaining ring 141, the inner end of the upper water retaining ring 141 extends to the annular connecting wall 12, and the upper water retaining ring 141 is arranged, so that the washing liquid drawn by the outer ring blade 14 is pumped towards the side edge of the outer ring pump chamber 24, and the effect of converting the upward impact force of the fluid into lateral impact force is achieved, so that the lateral liquid drainage efficiency of the invention is further improved, and meanwhile, the upper water retaining ring 141 is arranged, so that the strength of the outer ring blade 14 can be increased, the lateral liquid drainage efficiency is firmer, and the service life is longer.

Outer lane blade 14 bottom periphery is equipped with down water retaining ring 142 with 2 clearance fit of spiral case, and outer lane water inlet 241 is located down between water retaining ring 142 and the cyclic annular connecting wall 12, through setting up water retaining ring 142 down, makes this outer lane blade 14 more firm, and life is longer, and water retaining ring 142 can be used to the manger plate down simultaneously, is convenient for wash water and gets into from outer lane water inlet 241.

The principle of the impeller 1 is that the motor 3 drives the impeller 1 to rotate, washing water in the circulating water containing area 41 is sucked from the inner ring water inlet 231 and the outer ring water inlet 241, speed energy is given to the washing water through the rotation of the inner impeller 1 group and the outer impeller 1 group, the speed energy is converted into pressure energy through the inner ring pump chamber 23 and the outer ring pump chamber 24, the washing water is boosted, and the boosted washing water is pumped to the upper spray device and the lower spray device for spraying.

The impeller 1 comprises an upper impeller part 15 and a lower impeller part 16 which are arranged in a split manner, the lower end surface of the inner ring blade 13 of the upper impeller part 15 corresponds to the upper end surface of the inner ring blade 13 of the lower impeller part 16, and the structure specifically refers to the patent application number: 201621146684.7, the purpose of its structure design is to effectively reduce the difficulty of die design, make the process simpler, not only greatly reduce the manufacturing cost, but also significantly improve the machinability.

The invention relates to a double-water-path open type dishwasher water pump assembly which is a real one-machine double-pump structure, adopts a power motor to drive an impeller arranged inside and outside, and synchronously and respectively works in a pump shell arranged in an internal and external isolation way, and the pump body technology positioned in the pump shell at the inner side is basically different from the prior open type water pump which adopts a combined structure of an axial flow pump and a centrifugal pump, but an upper impeller part 15 is provided with an arc-shaped flow guide top surface, the outer end of the flow guide top surface extends to the edge position of an impeller blade, the flow guide top surface is matched with the blade of an upper impeller 15 to form a flow passage for converting cleaning water from an axial direction to a transverse direction, and central negative pressure formed at the upper impeller part 15 in a spray arm can be removed, so that the spray pressure of the cleaning water in the spray arm is increased, and the open type high pressure water pump is a real sense.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.

Claims

1. A double-water-path open type dishwasher water pump assembly comprises an impeller (1), a volute (2) and a motor (3), wherein the motor (3) drives the impeller (1) to rotate in the volute (2); the method is characterized in that: impeller (1) includes center pin (11), connects in inner circle blade (13) of center pin (11) and outer lane blade (14) of coaxial coupling in inner circle blade (13) periphery, and spiral case (2) are equipped with inner circle blade (13) complex inner circle pump chamber (23) and with outer lane blade (14) complex outer lane pump chamber (24), inner circle pump chamber (23) keep apart the setting with outer lane pump chamber (24), spiral case (2) bottom is equipped with inner circle water inlet (231) and outer lane water inlet (241) that communicate with inner circle pump chamber (23) intercommunication, spiral case (2) top is equipped with inner circle delivery port (232) with inner circle pump chamber (23) intercommunication, and spiral case (2) lateral part is equipped with outer lane delivery port (242) that communicate with outer lane pump chamber (24).

2. The dual water path open dishwasher pump assembly of claim 1, wherein: the impeller (1) is provided with an annular connecting wall (12), the inner ring blades (13) are connected to the inner side of the annular connecting wall (12), and the outer ring blades (14) are connected to the outer side of the annular connecting wall (12).

3. The dual water path open dishwasher pump assembly of claim 2, wherein: the volute (2) comprises an upper volute (21) and a lower volute (22), and the upper volute (21) is arranged above the lower volute (22); the upper volute (21) is provided with an inner ring wall (211) corresponding to the annular connecting wall (12), and the inner side of the inner ring wall (211) and the inner side of the annular connecting wall (12) form the inner ring pump chamber (23); the upper volute (21), the lower volute (22), the inner ring wall (211) and the annular connecting wall (12) are encircled to form the outer ring pump chamber (24).

4. The dual water path open dishwasher pump assembly according to claim 3, characterized in that: the volute (2) further comprises a volute bottom (25) arranged between the upper volute (21) and the lower volute (22), and the upper volute (21), the lower volute (22), the volute bottom (25) and the annular connecting wall (12) are surrounded to form the outer ring pump chamber (24).

5. The dual water path open dishwasher pump assembly of claim 2, wherein: a water distribution ring (26) corresponding to the annular connecting wall (12) is arranged below the volute (2), the water distribution ring (26) is used for dividing the lower part of the volute (2) into two water drawing areas, one water drawing area is communicated with the inner ring pump chamber (23) through the inner ring water inlet (231), and the other water drawing area is communicated with the outer ring pump chamber (24) through the outer ring water inlet (241).

6. The dual water path open dishwasher pump assembly of claim 5, wherein: the water distribution device is characterized by further comprising a water tank body (4), wherein the water distribution ring (26) is provided with a mounting hole (261) for fixedly mounting the motor (3) below the water tank body (4) and a mounting guide post (262) for fixedly mounting the volute (2) at the bottom of the water tank body (4).

7. The dual water path open dishwasher pump assembly of claim 1, wherein: the side of spiral case (2) is equipped with outlet conduit (27), outer lane delivery port (242) communicate the liquid outlet of outlet conduit (27), the liquid outlet of outlet conduit (27) is flowing back up, flowing back down or side flowing back.

8. The dual water path open dishwasher pump assembly of claim 2, wherein: the upper portion of outer lane blade (14) is equipped with water retaining ring (141) on, the inner of water retaining ring (141) extends to cyclic annular connecting wall (12).

9. The dual water path open dishwasher pump assembly of claim 2, wherein: the periphery of the bottom of the outer ring blade (14) is provided with a lower water retaining ring (142) in clearance fit with the volute (2), and the outer ring water inlet (241) is positioned between the water retaining ring (142) and the annular connecting wall (12).

10. The dual water path open dishwasher pump assembly of claim 9, wherein: the bottom of the outer ring blade (14) is provided with an axial flow bending section.