A double water channel open dishwasher water pump assembly

Abstract

The present invention discloses a double-water-path open dishwasher water pump assembly, comprising an impeller, a volute, and a motor, wherein the motor drives the impeller to rotate in the volute; the impeller comprises a central axis, an inner ring blade connected to the central axis, and an outer ring blade coaxially connected to the outer 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 isolated from each other, an inner ring water inlet connected with the inner ring pump chamber and an outer ring water inlet connected with the outer ring pump chamber are provided at the bottom of the volute, an inner ring water outlet connected with the inner ring pump chamber is provided at the top of the volute, and an outer ring water outlet connected with the outer ring pump chamber is provided at the side of the volute, cleaning water is pumped to a spray device arranged at the bottom of a water tank body through the cooperation of the inner ring blade and the inner ring pump chamber, and cleaning water is pumped to a spray device arranged in other directions of the water tank body through the cooperation of the outer ring blade and the outer ring pump chamber, the design has a compact structure, reduced cost, and is easy to assemble.

Description

Technical Field

[0001] The invention relates to the technical field of dishwashers, and in particular to a water pump assembly of a double-water-path open dishwasher. Background Art

[0002] The dishwasher uses recycled washing water. Usually, a filter device and a water tank are set at the bottom of the dishwasher tank. The washing water sprayed by the spray arm enters the water tank through the filter device for recycling, thereby achieving the purpose of water saving. The existing dishwasher water pump assembly includes a washing pump and a drainage pump. The washing pump is used to spray the washing water in the water tank through the spray arm into the dishwasher tank to wash the dishes, and the drainage pump is used to discharge the washing water in the water tank.

[0003] The existing dishwasher is only provided with a lower spray device at the bottom of the water tank body, resulting in low cleaning efficiency and general cleaning quality of the dishwasher. In order to solve the above problems, a spray structure is generally added in other directions of the dishwasher, such as adding an upper spray device on the top of the dishwasher. However, the added upper spray device needs to be provided with a separate power pump to pump the cleaning water at the bottom of the water tank body into the upper spray device, resulting in a higher cost of the dishwasher. At the same time, a separate power pump will take up more space, making the internal structure of the dishwasher complicated and inconvenient to assemble, which is not conducive to market promotion. Alternatively, a power pump is used, and a structure with two water outlets is further divided on the output water path of the power pump. In this structure, the water pressure cannot reach a higher pressure after the water is discharged from the two outlets.

[0004] The existing dishwasher water pump can also refer to the open water pump disclosed in CN201310750285.6. The open water pump is suspended at the bottom of the water tank, and is defined by a water inlet located below or on the side of the bracket and a water outlet extending into the spray arm. The technical essence of the open water pump is a combination of an axial flow pump at the lower section and a centrifugal pump at the upper section. The function of the axial flow pump is to use the axial flow curved section of the impeller to draw water upward, and the function of the centrifugal pump is to centrifugally throw out the cleaning water drawn by the axial flow pump, and at the same time form a negative pressure at the centrifugal pump to further draw water from the water inlet. Since this open water pump is only provided with one water outlet extending into the spray arm, it cannot separate a second water outlet for supplying water to the double spray arms. If other spray arms are provided inside the dishwasher sink, a separate power pump needs to be provided. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-water-path open dishwasher water pump assembly, which pumps cleaning water to a spray device arranged at the bottom of a water tank body through the cooperation of inner ring blades and inner ring pump chambers, and pumps cleaning water to spray devices arranged in other directions of the water tank body through the cooperation of outer ring blades and outer ring pump chambers. There is no need to set up a power pump separately. This design has a compact structure, reduced cost, and is easy to assemble.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a dual-water-path open dishwasher water pump assembly, comprising an impeller, a volute, and a motor, wherein the motor drives the impeller to rotate in the volute; the impeller comprises a central axis, inner ring blades connected to the central axis, and outer ring blades coaxially connected to the outer periphery 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 is isolated from the outer ring pump chamber, the bottom of the volute is provided with an inner ring water inlet connected to the inner ring pump chamber and an outer ring water inlet connected to the outer ring pump chamber, the top of the volute is provided with an inner ring water outlet connected to the inner ring pump chamber, and the side of the volute is provided with an outer ring water outlet connected to the outer ring pump chamber.

[0007] Furthermore, 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.

[0008] Furthermore, the volute includes an upper volute and a lower volute, 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, the inner side of the inner annular wall and the inner side of the annular connecting wall form the inner circle pump chamber; the upper volute, the lower volute, the inner annular wall and the annular connecting wall surround and form the outer circle pump chamber.

[0009] Furthermore, the volute also includes 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 surround and form the outer ring pump chamber.

[0010] Furthermore, a water dividing ring corresponding to the annular connecting wall is provided below the volute, and the water dividing ring is used to divide the bottom of the volute into two water drawing areas, one of which is connected to the inner circle pump chamber through the inner circle water inlet, and the other is connected to the outer circle pump chamber through the outer circle water inlet.

[0011] Furthermore, it also includes a water tank body, and the water dividing ring is provided with a mounting hole for fixing the motor below the water tank body and a mounting guide column for fixing the volute to the bottom of the water tank body.

[0012] Furthermore, a water outlet pipe is provided on the side of the volute, and the outer ring water outlet is connected to the liquid outlet of the water outlet pipe, and the liquid outlet of the water outlet pipe discharges liquid upward, downward or sideways.

[0013] Furthermore, an upper water retaining ring is provided on the upper part of the outer ring blades, and the inner end of the upper water retaining ring extends to the annular connecting wall.

[0014] Furthermore, a lower water retaining ring that matches the volute gap is provided on the outer periphery of the bottom of the outer ring blades, and the outer ring water inlet is located between the lower water retaining ring and the annular connecting wall.

[0015] Furthermore, an axial flow bending section is provided at the bottom of the outer ring blade.

[0016] In summary, the present invention has the following beneficial effects:

[0017] A double-water-path open-type dishwasher water pump assembly, wherein a power component drives an impeller to rotate, and inner ring blades suck the cleaning water in a water tank body into the inner ring water inlet, and through the inner ring pump chamber, the cleaning water is pumped from the inner ring water outlet to a spray device arranged at the bottom of the water tank body for spraying by the spray device; at the same time, outer ring blades suck the cleaning water in the water tank body into the outer ring water inlet, and through the outer ring pump chamber, the cleaning water is pumped from the outer ring water outlet to other spray devices, preferably spray devices arranged at the top of the dishwasher, for spraying by the spray device, and thus there is no need to separately arrange a power pump. The design has a compact structure, reduced cost, and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the present invention when the liquid outlet of the water outlet pipe is arranged toward the side.

[0019] Figure 2 It is an exploded view when the liquid outlet of the water outlet pipe of the present invention is arranged toward the side.

[0020] Figure 3 It is an overall schematic diagram when the liquid outlet of the water outlet pipe of the present invention is arranged toward the upper end.

[0021] Figure 4 It is a cross-sectional view of the present invention.

[0022] Figure 5 It is an enlarged view of point A of the present invention.

[0023] Figure 6 It is an exploded view of the combination of the present invention, the dishwasher water tank body and the lower spray device.

[0024] Figure 7 It is a structural schematic diagram of the present invention when the liquid outlet of the water outlet pipe is arranged downward.

[0025] Figure 8 It is a schematic diagram of the overall structure of the present invention.

[0026] Fig. 9 It is a schematic diagram of an impeller provided with an upper water retaining ring in the present invention.

[0027] Fig.10 It is a schematic diagram of an impeller without an upper water retaining ring in the present invention.

[0028] Fig.11 It is a structural schematic diagram of the lower volute when the water outlet pipe is arranged downward in the present invention.

[0029] In the figure: 1, impeller; 11, central axis; 12, annular connecting wall; 13, inner ring blades; 14, outer ring blades; 141, upper water retaining ring; 142, lower water retaining ring; 15, upper impeller part; 16, lower impeller part; 2, volute; 21, upper volute; 211, inner ring wall; 22, lower volute; 221, curved surface; 23, inner ring pump chamber; 231, inner ring water inlet; 232, inner ring water outlet; 2 4. Outer ring pump chamber; 241. Outer ring water inlet; 242. Outer ring water outlet; 25. Volute bottom; 26. Water dividing ring; 261. Mounting hole; 262. Mounting guide column; 27. Water outlet pipe; 28. Connecting pipe; 3. Motor; 31. Protective shell; 32. Sealing ring; 4. Sink body; 41. Circulating water storage area; 5. Spray arm; 51. Spray arm fixing ring; 52. Nozzle; 53. Spray flow channel. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] like Figure 1-11 As shown, a dual-waterway open dishwasher water pump assembly includes an impeller 1, a volute 2, and a motor 3. The motor 3 drives the impeller 1 to rotate in the volute 2. The dishwasher water pump assembly also includes a water tank body 4. The bottom of the water tank body 4 includes a circulating water holding area 41. The upper cover of the circulating water holding area 41 is equipped with a filtering device (not shown in the figure). A protective shell 31 for accommodating the motor 3 is fixedly installed at the lower end of the water tank body 4 corresponding to the position of the circulating water holding area 41. A sealing ring 32 is arranged between the output end of the motor 3 and the protective shell 31 to prevent cleaning water from invading the motor 3.

[0032] The impeller 1 includes a central axis 11, an inner ring blade 13 connected to the central axis 11, and an outer ring blade 14 coaxially connected to the outer periphery of the inner ring blade 13. The volute 2 is provided with an inner ring pump chamber 23 matched with the inner ring blade 13 and an outer ring pump chamber 24 matched with the outer ring blade 14. The inner ring pump chamber 23 is isolated from the outer ring pump chamber 24. The bottom of the volute 2 is provided with an inner ring water inlet 231 connected to the inner ring pump chamber 23 and an outer ring water inlet 241 connected to the outer ring pump chamber 24. The top of the volute 2 is provided with an inner ring water outlet 232 connected to the inner ring pump chamber 23. The side of the volute 2 is provided with an outer ring water outlet 242 connected to the outer ring pump chamber 24. The central axis 11 is a hollow structure. The output end of the motor 3 extends into the hollow structure and is fixedly connected to the central axis 11, so that the motor 3 drives the impeller 1 to rotate to draw water.

[0033] 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. By providing the annular connecting wall 12, the structure of the impeller 1 is more stable and the strength is higher. The annular connecting wall 12 also increases the mass of the lower end of the impeller 1, preventing the output shaft of the motor 3 from bending due to the impeller 1 being heavy on the top and light on the bottom.

[0034] The volute 2 includes an upper volute 21 and a lower volute 22, the upper volute 21 is arranged above the lower volute 22; the upper volute 21 is provided with an inner annular wall 211 corresponding to the annular connecting wall 12, and the inner side of the inner annular wall 211 and the inner side of the annular connecting wall 12 form the inner circle 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 circle pump chamber 24, specifically, the inner annular wall 211 extends along the direction of the annular connecting wall 12 and is gap-matched with the annular connecting wall 12, the distance of the gap ensures that the annular connecting wall 12 does not interfere with the inner annular wall 211 during rotation, and at the same time, the distance of the gap can ensure that the cleaning water of the inner circle pump chamber 23 and the cleaning water of the outer circle pump chamber 24 do not interfere with each other during their respective pumping processes.

[0035] The volute 2 also includes 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 surround and form the outer ring pump chamber 24. The upper volute 21 and the volute bottom 25 are fixed in advance by screws to ensure that the water path of the outer ring pump chamber 24 is smooth. At the same time, since the space of the outer ring pump chamber 24 is reduced, the pumping efficiency of the outer ring pump chamber 24 is improved.

[0036] A water dividing ring 26 corresponding to the annular connecting wall 12 is provided below the volute 2. The water dividing ring 26 is used to divide the bottom of the volute 2 into two water drawing areas, one of which is connected to the inner circle pump chamber 23 through the inner circle water inlet 231, and the other is connected to the outer circle pump chamber 24 through the outer circle water inlet 241. The water dividing ring 26 is provided with a mounting hole 261 for fixing the motor 3 below the water tank body 4 and a mounting guide column 262 for fixing the volute 2 to the bottom of the water tank body 4. Specifically, the inner end of the water dividing ring 26 extends to the annular connecting wall 12 and leaves a gap with the annular connecting wall 12. The water dividing ring 26 fixes the motor 3 to the bottom of the inner tank in advance by screws, and the upper volute 21 fixes the lower volute 22 on the guide column of the water dividing ring 26 by screws. The water at the bottom of the volute 2 is divided into two upper and lower paths by the water dividing ring 26 to evenly distribute the water.

[0037] An axial flow bending section is provided at the bottom of the outer ring blades 14. Specifically, the outer ring blades 14 are radially distributed on the outer periphery of the annular connecting wall 12, and the outer ring blades 14 are bent along the rotation direction of the central axis 11, so that the inner ring blades 13 and the outer ring blades 14 can not only draw water at a low position, but also 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.

[0038] The lowest end of the outer blade 14 is higher than the lowest end of the inner blade 13 . Of course, the lowest end of the inner blade 13 may also be located between the highest end of the outer blade 14 and the lowest end of the outer blade 14 .

[0039] The dishwasher is provided with a lower spray device and an upper spray device (not shown in the figure). Of course, the upper spray device can also be a spray device in other directions, such as a spray structure arranged in the left and right directions or the front and back directions of the dishwasher. The present invention specifically describes the lower spray device and the upper spray device. The lower spray device includes a spray arm 5 and a spray arm fixing ring 51. The spray arm fixing ring 51 is rotatably connected to the upper volute 21. The spray arm 5 is fixedly connected to 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, and the nozzles 52 are arranged in different directions. The upper spray device includes a detachably connected The upper spray arm 5 and the lower spray arm 5 are formed with a spray channel 53 connected to the nozzle 52, and the spray channel 53 is connected to the inner circle water outlet 232. Specifically, the lower spray arm is clearance-matched with the upper volute 21, so that all or most of the cleaning water pumped from the inner circle water outlet 232 enters the spray channel 53, and the motor 3 drives the impeller 1 to rotate, and the cleaning water in the circulating water holding area is pumped into the spray channel 53 and sprayed from the nozzle 52 for washing. At the same time, 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 is filtered by the filtering device and then flows back to the circulating water holding area 41.

[0040] A water outlet pipe 27 is provided on the side of the volute 2, and the outer ring water outlet 242 is connected to the liquid outlet of the water outlet pipe 27, and the liquid outlet of the water outlet pipe 27 discharges liquid upward, downward or to the side.

[0041] When the outlet of the water outlet pipe 27 of the volute 2 discharges liquid toward the side, Figure 1-2As shown, 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 spray device through a connecting pipe 28. The water outlet pipe 27 and the connecting pipe 28 are both located inside the water tank body 4, and can be specifically fixedly installed on the inner wall of the water tank body 4. Through this arrangement, the flow channel distance between the outer ring water outlet 242 and the upper spray device is reduced, and the energy loss in the process of pumping the cleaning water is reduced, thereby improving the pumping pressure of the cleaning water, ensuring the cleaning efficiency and cleaning quality of the dishwasher. At the same time, the outer ring water flow surface of the lower volute 22 in the structure is a curved surface 221 that gradually changes upward from low to high.

[0042] The water outlet pipe 7 is bent and extended along the same height of the volute 2 so that the outer ring liquid outlet 131 discharges liquid toward the side, that is, the liquid outlet of the water outlet pipe 27 is as follows: Figure 1-2 As shown, when the outlet of the water outlet pipe 27 of the volute 2 discharges liquid toward the upper end, as shown in Figure 3 As shown, the connecting pipe 28 is connected to the water pipe 27 so that the washing liquid discharged from its liquid outlet is supplied to the upper spray device upward through the connecting pipe 28. In the above two technical solutions, the connecting pipe 28 is located inside the water tank body 4, that is, it does not pass through the lower part of the water tank body 4.

[0043] When the liquid outlet of the water outlet pipe 27 of the volute 2 is discharging liquid toward the lower end, Figure 6 , 7 As shown in Figures 8 and 11, the outlet pipe 27 passes through the bottom of the water tank body 4 and is connected to the upper spray device through the connecting pipe 28 located at the lower end of the water tank body 4. In this structure, the connecting pipe is located outside the water tank body 4. Compared with 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 spray device in this structure is average. At the same time, in order to prevent the washing water in the outer ring pump chamber 24 from generating a drop in height during the flow, the outer ring water flow surface of the lower volute 22 is arranged as a gradient curved surface 221 from high to low along the rotation direction of the outer ring blades 14, so that the washing water is discharged through the outer ring water outlet 242, which is beneficial to pressurizing the washing water in the outer ring pump chamber 24 to improve the pumping efficiency.

[0044] An upper water retaining ring 141 is provided on the upper part of the outer ring blades 14, and the inner end of the upper water retaining ring 141 extends to the annular connecting wall 12. By providing the upper water retaining ring 141, the washing liquid absorbed by the outer ring blades 14 is pumped toward the side of the outer ring pump chamber 24, which plays a role in converting the upward impact force of the fluid into a lateral impact force, thereby further improving the lateral liquid discharge efficiency of the present invention. At the same time, providing the upper water retaining ring 141 can also increase the strength of the outer ring blades 14, making them more solid and having a longer service life.

[0045] The outer ring blades 14 are provided with a lower water retaining ring 142 at the bottom periphery thereof, which cooperates with the clearance of the volute 2. The outer ring water inlet 241 is located between the lower water retaining ring 142 and the annular connecting wall 12. By providing the lower water retaining ring 142, the outer ring blades 14 are made more solid and have a longer service life. At the same time, the lower water retaining ring 142 can be used to retain water, so that cleaning water can enter from the outer ring water inlet 241.

[0046] The principle of the impeller 1 is that the motor 3 drives the impeller 1 to rotate, and the cleaning water located in the circulating water holding area 41 is sucked in from the inner ring water inlet 231 and the outer ring water inlet 241, and the cleaning water is given velocity energy by the rotation of the inner impeller 1 group and the outer impeller 1 group, and passes through the inner ring pump chamber 23 and the outer ring pump chamber 24 respectively, so that the velocity energy is converted into pressure energy, and then the cleaning water is pressurized, and the pressurized cleaning water is pumped to the upper spray device and the lower spray device for spraying.

[0047] The impeller 1 includes an upper impeller part 15 and a lower impeller part 16 which are separately arranged. The lower end surface of the inner ring blades 13 of the upper impeller part 15 corresponds to the upper end surface of the inner ring blades 13 of the lower impeller part 16. The structure specifically refers to patent application number: 201621146684.7. The purpose of its structural design is to effectively reduce the difficulty of mold design and make processing simpler, which not only greatly reduces the manufacturing cost but also significantly improves the machinability.

[0048] The dual-water-path open dishwasher water pump assembly of the present invention is a true one-machine-dual-pump structure, which adopts a power motor to drive an impeller arranged inside and outside, and works synchronously in the pump casings that are isolated from each other inside and outside. The pump body technology located in the inner pump casing is also essentially different from the existing open water pump that adopts a combined structure of an axial flow pump and a centrifugal pump. Instead, the upper impeller part 15 has an arc-shaped guide top surface, and the outer end of the guide top surface extends to the edge of the impeller blades. The guide top surface cooperates with the blades of the upper impeller 15 to form a flow channel for the washing water to be transformed from axial to lateral, which can remove the central negative pressure formed at the upper impeller part 15 in the spray arm, thereby increasing the injection pressure of the washing water in the spray arm. It is a true open high-pressure water pump.

[0049] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A double-water-path open dishwasher water pump assembly, comprising an impeller (1), a volute (2), and a motor (3), wherein the motor (3) drives the impeller (1) to rotate in the volute (2); characterized in that: The impeller (1) comprises a central axis (11), inner ring blades (13) connected to the central axis (11), and outer ring blades (14) coaxially connected to the outer periphery 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 isolation; the bottom of the volute (2) is provided with an inner ring water inlet (231) connected to the inner ring pump chamber (23) and an outer ring water inlet (241) connected to the outer ring pump chamber (24); the top of the volute (2) is provided with an inner ring water outlet (232) connected to the inner ring pump chamber (23); and the side of the volute (2) is provided with an outer ring water outlet (242) connected to the outer ring pump chamber (24).

2. A dual-waterway open dishwasher water pump assembly according to claim 1, characterized in that: 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. A dual-waterway open dishwasher water pump assembly according to claim 2, characterized in that: The volute (2) comprises an upper volute (21) and a lower volute (22), wherein the upper volute (21) is arranged above the lower volute (22); the upper volute (21) is provided with an inner annular wall (211) corresponding to the annular connecting wall (12), and the inner side of the inner annular wall (211) and the inner side of the annular connecting wall (12) form the inner circle 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 circle pump chamber (24).

4. A dual-waterway open dishwasher water 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); the upper volute (21), the lower volute (22), the volute bottom (25) and the annular connecting wall (12) surround and form the outer ring pump chamber (24).

5. The double-water-path open dishwasher water pump assembly according to claim 2, characterized in that: A water dividing ring (26) corresponding to the annular connecting wall (12) is provided below the volute (2). The water dividing ring (26) is used to divide the lower part of the volute (2) into two water-drawing areas, one of which is connected to the inner pump chamber (23) through the inner water inlet (231), and the other is connected to the outer pump chamber (24) through the outer water inlet (241).

6. A dual-waterway open dishwasher water pump assembly according to claim 5, characterized in that: It also includes a water tank body (4), and the water dividing ring (26) is provided with a mounting hole (261) for fixing the motor (3) below the water tank body (4) and a mounting guide column (262) for fixing the volute (2) at the bottom of the water tank body (4).

7. The double water path open dishwasher water pump assembly according to claim 1, characterized in that: A water outlet pipe (27) is provided on the side of the volute (2), and the outer ring water outlet (242) is connected to the liquid outlet of the water outlet pipe (27), and the liquid outlet of the water outlet pipe (27) discharges liquid upward, downward or to the side.

8. The double water path open dishwasher water pump assembly according to claim 2, characterized in that: An upper water retaining ring (141) is provided on the upper part of the outer ring blade (14), and the inner end of the upper water retaining ring (141) extends to the annular connecting wall (12).

9. A dual-waterway open dishwasher water pump assembly according to claim 2, characterized in that: A lower water retaining ring (142) which is clearance-matched with the volute (2) is provided on the outer periphery of the bottom of the outer ring blades (14), and the outer ring water inlet (241) is located between the water retaining ring (142) and the annular connecting wall (12).

10. A dual-waterway open dishwasher water pump assembly according to claim 9, characterized in that: An axial flow bending section is provided at the bottom of the outer ring blade (14).

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