A double pump system and a cleaning machine using the double pump system

Abstract

The present invention relates to a double pump system and a cleaning machine using the double pump system, wherein the double pump system comprises an upper impeller, a lower impeller, an upper shell, a lower shell and a driving member. The upper shell has a first accommodating chamber for installing the upper part of a first blade, the upper part of the lower shell has a second accommodating chamber for installing the lower part of the first blade, the side wall of the lower shell is provided with a first water inlet for supplying water into the second accommodating chamber, the lower part of the lower shell has a third accommodating chamber for installing the lower impeller, and the side wall and / or the bottom wall of the lower shell are provided with a second water inlet and a water outlet. The present invention provides an open double pump system, wherein the second accommodating chamber, the first accommodating chamber and the upper impeller located at the upper part are used for bottom spray water supply, and the third accommodating chamber and the lower impeller located at the lower part are used for top and / or middle spray water supply. Since the power of the two water flows is independently supplied by the corresponding pumps, the head and water flow of each water flow are improved, which is conducive to improving the cleaning effect; the double pump system of the present invention is easy to disassemble and clean, and avoids bacterial growth.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to a double pump system and a washing machine using the double pump system. Background Art

[0002] For desktop and cabinet dishwashers, since the washing space is large, in order to achieve a better washing effect, they are generally designed with three spray arms: top, middle and lower. When working, the washing pump transports water to the top, middle and lower spray arms through pipes. The water is sprayed out from the top, middle and lower spray arms and rinses the dishes before falling back into the water cup at the bottom of the dishwasher. The washing pump transports the fallen water to the top, middle and lower spray arms again to complete a cycle.

[0003] For example, the Chinese invention patent application "Energy-saving dishwasher" (application number: CN201611232345.5) with application publication number CN106859563A discloses a structure, which includes a cavity for accommodating tableware and providing a cleaning space, a spray system for spraying water to clean the tableware, and a pump body for pumping water and supplying water to the spray system; the spray system is arranged in the cavity; the water pumping end of the pump body is connected to the cavity, and the water supply end is connected to the spray system; the spray system includes an inner water pipe and two or more spray devices, and the two or more spray devices are respectively arranged on the inner water pipe; the water supply end of the pump body is connected to a water distribution device, and the water distribution device is provided with two or more water outlets corresponding to the two or more spray devices, and the spray device is connected to the corresponding water outlets; when working, the water distribution device conducts one or more water outlets according to instructions, so that one or more spray devices perform cleaning work.

[0004] In the above-mentioned existing dishwashers capable of bottom spraying and top spraying, the pump used to supply water to the spray system generally adopts a closed structure, that is, the volute of the washing pump is arranged below the housing, a rotatable impeller is arranged inside the volute, the water inlet of the washing pump volute is connected to the bottom of the washing chamber, and the water outlet of the volute is connected to a water diversion device, which divides the water flow into a first branch for supplying water to the bottom spray arm and a second branch for supplying water to the top spray arm. Since the water pressure of the water for top spraying and the water for bottom spraying are independently supplied by the washing pump, the head, flow rate and impact force of the water flow on each branch after diversion are greatly reduced, affecting the cleaning effect; at the same time, the closed volute fixed below the housing is difficult to disassemble and clean, and after long-term use, it will breed bacteria due to the accumulation of residues, which not only affects the washing effect but also causes a bad experience for users. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a dual pump system which can provide power for two washing water routes respectively, thereby improving the head and water flow rate and thus improving the cleaning effect, in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a dual pump system which adopts an open volute to facilitate disassembly, assembly and cleaning in view of the current status of the prior art.

[0007] The third technical problem to be solved by the present invention is to provide a cleaning machine having the above-mentioned dual pump system in view of the current status of the prior art.

[0008] The technical solution adopted by the present invention to solve at least one of the above technical problems is: a dual pump system, characterized in that: it includes:

[0009] An upper impeller has a first shaft located at the center and first blades distributed at intervals in the circumferential direction on the circumference of the first shaft and extending in the axial direction;

[0010] A lower impeller having a second shaft located at the center and second blades distributed at intervals along the circumferential direction on the circumference of the second shaft;

[0011] An upper shell body, having a first accommodating cavity for mounting the upper portion of the first blade, a spray hole in fluid communication with the first accommodating cavity being formed on a top wall and / or a side wall of the upper shell body; and

[0012] The lower shell is connected to the bottom of the upper shell, the upper part of the lower shell has a second accommodating chamber for installing the lower part of the first blade, the side wall of the lower shell is provided with a first water inlet for supplying water into the second accommodating chamber, the lower part of the lower shell has a third accommodating chamber for installing the lower impeller, the side wall and / or the bottom wall of the lower shell is provided with a second water inlet for supplying water into the third accommodating chamber and a water outlet for outputting water from the third accommodating chamber.

[0013] In the above solution, a partition is provided in the middle of the lower shell for separating the second accommodating chamber and the third accommodating chamber into relatively independent chambers. The second accommodating chamber and the third accommodating chamber are relatively independent, so that the upper impeller can be used to supply water to the lower spray, and the lower impeller can be used to supply water to the top and / or middle spray, so as to reduce the fluid disturbance between each other, reduce the capacity loss, and improve the water head, water flow and injection force.

[0014] Preferably, the third accommodating chamber is located below the partition and is substantially disc-shaped, the second water inlet is provided on the bottom wall of the lower shell, and the water outlet is provided on the side wall of the lower shell and is tangentially connected to the third accommodating chamber through a guide pipe. This structure is conducive to reducing the capacity loss of the third accommodating chamber to output water flow.

[0015] Preferably, the second accommodating chamber is located above the partition and extends vertically, the inner diameter of the second accommodating chamber is smaller than the inner diameter of the third accommodating chamber and is adapted to the lower part of the first blade. This structure is conducive to reducing the energy loss of water flow when flowing through the second accommodating chamber.

[0016] Preferably, a transversely extending ∩-shaped enclosure is provided on the top wall of the partition, and the enclosure and the partition together enclose a water inlet channel connected to the second accommodating chamber, and the outer end of the water inlet channel constitutes the first water inlet. Such a structure is not only convenient for production and manufacturing, but also places the water inlet channel at the bottom of the second accommodating chamber, which is conducive to reducing water flow disturbance and further reducing the capacity loss of water flow when flowing through the second accommodating chamber.

[0017] In order to facilitate assembly, a support plate extending in the radial direction is provided on the outer peripheral wall of the upper part of the lower shell, and the upper shell is constrained on the support plate. A clamping ring is provided on the upper wall surface of the support plate, and a clamping foot that can rotatably pass through the clamping ring and is clamped and limited with the bottom wall of the clamping ring is provided on the bottom wall of the upper shell, so that the upper shell is detachably connected to the top of the lower shell.

[0018] Preferably, a third water inlet is provided on the bottom wall of the upper shell body corresponding to the first accommodating chamber, and the third water inlet is connected to the upper end of the second accommodating chamber. The diameter of the third water inlet is larger than the inner diameter of the second accommodating chamber, and the inner diameter of the upper part of the lower shell body gradually expands near the upper end of the second accommodating chamber to form a guide portion that can smoothly transition and connect with the inner bottom wall of the first accommodating chamber. This structure is conducive to reducing the energy loss of water flow in the process of entering the first accommodating chamber from the second accommodating chamber.

[0019] Preferably, the outer edge of the guide portion is arranged close to the inner edge of the third water inlet, and a baffle extending radially and supported on the bottom wall of the upper shell is provided on the outer peripheral wall of the guide portion, and the outer edge of the baffle corresponds to the inner edge of the clamping foot. This structure is conducive to improving the sealing performance at the third water inlet and preventing water leakage from affecting the head of the bottom spray.

[0020] In the present invention, the upper part of the first blade is a centrifugal blade, and the lower part is an axial flow blade; the second blade is a centrifugal blade.

[0021] In each of the above schemes, the dual pump system further includes a driving member for driving the upper impeller and the lower impeller to rotate. The driving member is arranged below the lower housing and the output shaft is arranged upward. The output shaft passes through the lower housing from bottom to top and extends into the first accommodating cavity of the upper housing and is connected to the lower impeller and the upper impeller respectively. With this structure, a dual pump system is constructed with one power source, which simplifies the overall structure and reduces production costs, and is more convenient for controlling the water supply.

[0022] Preferably, the output shaft is radially limited with the upper impeller and the lower impeller respectively, and a nut capable of preventing the upper impeller from moving axially along the output shaft is provided at the upper end of the output shaft. The above structure is convenient for disassembly and assembly. After removing the upper housing from the clamping ring, the nut can be unscrewed to remove the upper impeller, and the upper cavity of the upper housing, the upper impeller and the lower housing can be cleaned to avoid bacterial growth and improve the cleaning effect.

[0023] A cleaning machine using the above-mentioned dual pump system includes a box body and a water supply pipe that can transport water at the bottom of the box body upwards, characterized in that the lower shell is constrained on the bottom wall of the box body and the water outlet is connected to the lower end of the water supply pipe.

[0024] Preferably, the water supply pipe has a relatively independent first branch pipe and a second branch pipe, the first branch pipe is used to deliver water to the middle of the box, and the second branch pipe is used to deliver water to the top of the box. With such a structure, spraying of the lower, middle and top layers can be achieved, which is conducive to improving the cleaning effect.

[0025] Preferably, a water-dividing valve for controlling the circulation of the first branch pipe and the second branch pipe is also provided at the bottom of the box body. The water inlet of the water-dividing valve is connected to the water outlet of the lower shell body, the first water outlet of the water-dividing valve is connected to the input end of the first branch pipe, and the second water outlet of the water-dividing valve is connected to the input end of the second branch pipe. This structure is convenient for controlling the use status of the middle layer and the top layer spraying as needed. For example, the first branch pipe can be closed and the second branch pipe can be opened to spray only the top layer; the first branch pipe can also be opened and the second branch pipe can be closed to spray only the middle layer to meet more usage requirements.

[0026] Compared with the prior art, the advantages of the present invention are as follows: the present invention provides an open dual-pump system, wherein the second accommodating chamber, the first accommodating chamber and the upper impeller located at the upper part are used for bottom spray water supply, and the third accommodating chamber and the lower impeller located at the lower part are used for top and / or middle spray water supply. Since the power of the two water flows is independently supplied by the corresponding pumps, the head and water flow rate of each water flow are improved, which is beneficial to improving the cleaning effect. The dual-pump system of the present invention is easy to disassemble and assemble. The upper shell can be removed from the lower shell, and the upper shell, the upper impeller and the lower shell can be cleaned to avoid bacterial growth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a dual pump system in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure from another angle;

[0029] Figure 3 A cross-sectional view of a dual pump system according to an embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the lower housing in an embodiment of the present invention;

[0031] Figure 5 for Figure 4 A schematic diagram of the structure from another angle;

[0032] Figure 6 is a cross-sectional view of the lower housing in an embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the structure of a cleaning machine in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings.

[0035] The dual pump system of this embodiment can be applied to a larger dishwasher to supply water for the bottom spray, the top spray and / or the middle spray, but the dual pump system of this embodiment is not limited to this use environment.

[0036] like Figures 1 to 6 As shown, the dual pump system of this embodiment includes an upper impeller 1, a lower impeller 2, an upper casing 3, a lower casing 4 and a driving member 5.

[0037] The upper impeller 1 has a first shaft 11 located in the center and a plurality of first blades 12 distributed circumferentially and extending axially on the circumference of the first shaft 11. The upper portion of the first blade 12 is a centrifugal blade and the lower portion is an axial flow blade.

[0038] The lower impeller 2 has a second shaft 21 located in the center and a plurality of second blades 22 distributed at intervals in the circumferential direction on the circumference of the second shaft 21 . The second blades 22 are centrifugal blades.

[0039] The upper shell 3 has a main body extending in the length direction, and the central part of the main body has a first accommodating cavity 31 for installing the upper part of the first blade 12. The two sides of the main body respectively have flow channels connected to the first accommodating cavity 31. A spray hole 32 connected to the flow channel is opened on the top wall of the upper shell 3, and the upper shell 3 constitutes a bottom spray arm structure.

[0040] The lower shell 4 is connected to the bottom of the upper shell 3, and the upper part of the lower shell 4 has a second accommodating chamber 41 for installing the lower part of the first blade 12, and the side wall of the lower shell 4 is provided with a first water inlet 411 for supplying water into the second accommodating chamber 41; the lower part of the lower shell 4 has a third accommodating chamber 42 for installing the lower impeller 2, and the bottom wall of the lower shell 4 is provided with a second water inlet 421 for supplying water into the third accommodating chamber 42, and the side wall is provided with a water outlet 422 for supplying water from the third accommodating chamber 42.

[0041] The driving member 5 is a motor, which is arranged below the lower shell 4 and the output shaft 51 is arranged upward. The output shaft 51 passes through the lower shell 4 from bottom to top and extends into the first accommodating cavity 31 of the upper shell 3 and is respectively connected to the lower impeller 2 and the upper impeller 1, so as to drive the upper impeller 1 and the lower impeller 2 to rotate.

[0042] Specifically, Figure 3 , 6 As shown, a partition plate 43 for separating the second accommodating chamber 41 and the third accommodating chamber 42 into relatively independent chambers is provided in the middle of the lower shell 4. The second accommodating chamber 41 and the third accommodating chamber 42 are relatively independent, so that water can be supplied to the lower spray through the upper impeller 1 and water can be supplied to the top and / or middle spray through the lower impeller 2, so as to reduce fluid disturbance between each other and reduce capacity loss, so as to improve water head, water flow and injection force.

[0043] The third accommodating chamber 42 is located below the partition 43 and is roughly disc-shaped. The second water inlet 421 is opened at the center of the bottom wall of the lower shell 4. The water outlet 422 is tangentially connected to the third accommodating chamber 42 through a guide pipe 423. This structure is beneficial to reducing the capacity loss of the third accommodating chamber 42 to output water flow.

[0044] The second accommodating chamber 41 is located above the partition 43 and extends vertically. The inner diameter of the second accommodating chamber 41 is smaller than the inner diameter of the third accommodating chamber 42 and is adapted to the lower part of the first blade 12. This structure is conducive to reducing the energy loss of water flow when flowing through the second accommodating chamber 41.

[0045] like Figure 4 , 5 6, a transversely extending ∩-shaped enclosure 431 is provided on the top wall of the partition 43, and the enclosure 431 and the partition 43 together enclose a water inlet channel 432 connected to the second accommodating chamber 41, and the outer end of the water inlet channel 432 constitutes the first water inlet 411. Such a structure is not only convenient for production, but also the water inlet channel 432 is placed at the bottom of the second accommodating chamber 41, which is conducive to reducing water flow disturbance and further reducing the capacity loss of water flow when flowing through the second accommodating chamber 42.

[0046] In order to facilitate assembly, a support plate 44 extending in the radial direction is provided on the outer peripheral wall of the upper part of the lower shell 4, and the upper shell 3 is constrained on the support plate 44. A clamping ring 441 is provided on the upper wall surface of the support plate 44, and a clamping foot 33 that can be rotatably arranged through the clamping ring 441 and is clamped and limited with the bottom wall of the clamping ring 441 is provided on the bottom wall of the upper shell 3, so that the upper shell 3 is detachably connected to the top of the lower shell 4.

[0047] like Figure 3As shown, a third water inlet 34 corresponding to the first accommodating chamber 31 is provided on the bottom wall of the upper shell 3, and the third water inlet 34 is connected to the upper end of the second accommodating chamber 41. The diameter of the third water inlet 34 is larger than the inner diameter of the second accommodating chamber 41, and the inner diameter of the upper part of the lower shell 4 is gradually enlarged near the upper end of the second accommodating chamber 41 to form a guide portion 412 that can smoothly transition and connect with the inner bottom wall of the first accommodating chamber 31. This structure is conducive to reducing the energy loss of water flow in the process of entering the first accommodating chamber 31 from the second accommodating chamber 41. The outer edge of the guide portion 412 is arranged near the inner edge of the third water inlet 34, and a baffle 413 extending radially and supported on the bottom wall of the upper shell 3 is provided on the outer peripheral wall of the guide portion 412, and the outer edge of the baffle 413 is arranged corresponding to the inner edge of the clamping foot 33. This structure is conducive to improving the sealing performance at the third water inlet 34, and avoiding water leakage and affecting the head of the bottom spray.

[0048] The output shaft 51 of this embodiment is radially limited with the upper impeller 1 and the lower impeller 2 respectively, and a nut is provided at the upper end of the output shaft 51 to prevent the upper impeller 1 from axially moving along the output shaft 51. The above structure is convenient for disassembly and assembly. After the upper housing 3 is removed from the clamping ring 441, the nut is screwed off to remove the upper impeller 1, and the upper cavity of the upper housing 3, the upper impeller 1 and the lower housing 4 is cleaned to avoid bacterial growth and improve the cleaning effect.

[0049] In this embodiment, if Figure 7 As shown, the cleaning machine using the above-mentioned dual pump system includes a box body 6 and a water supply pipe 7 that can transport water from the bottom of the box body 6 upwards. The lower shell 4 is constrained on the inner bottom wall of the box body 6 and the water outlet 422 is connected to the lower end of the water supply pipe 7. The water supply pipe 7 has a relatively independent first branch pipe 71 and a second branch pipe 72. The first branch pipe 71 is used to transport water to the middle of the box body, and the second branch pipe 72 is used to transport water to the top of the box body. With such a structure, spraying of the lower, middle and top layers can be achieved, which is conducive to improving the cleaning effect.

[0050] The bottom of the box body 6 is also provided with a water diverter valve 8 for controlling the circulation of the first branch pipe 71 and the second branch pipe 72. The water inlet of the water diverter valve 8 is connected to the water outlet 422 of the lower shell 4, the first water outlet of the water diverter valve 8 is connected to the input end of the first branch pipe 71, and the second water outlet of the water diverter valve 8 is connected to the input end of the second branch pipe 72. This structure is convenient for controlling the use status of the middle layer and the top layer spraying as needed. For example, the first branch pipe 71 can be closed and the second branch pipe 72 can be opened to spray only the top layer; the first branch pipe 71 can also be opened and the second branch pipe 72 can be closed to spray only the middle layer to meet more use needs.

[0051] When in use, the output shaft 51 of the driving member 5 rotates, driving the upper impeller 1 and the lower impeller 2 to rotate, and the axial flow blades at the lower part of the first blade 12 suck water from the first water inlet 411 into the second accommodating chamber 41 and transport it upward to the first accommodating chamber 31. The water in the first accommodating chamber 31 is sprayed out through the spray hole 32 under the action of the upper part of the first blade 12; the second blade 22 sucks water from the second water inlet 421 into the third accommodating chamber 42, and transports it to the water supply pipe 7 through the water outlet 422 along the guide pipe 423 in the circumferential direction, and the water supply pipe 7 transports the water flow upward for top and / or middle spraying.

[0052] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0053] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A dual pump system, characterized in that: include An upper impeller (1) has a first shaft (11) located at the center and first blades (12) distributed at intervals in the circumferential direction on the circumferential surface of the first shaft (11) and extending in the axial direction; The lower impeller (2) has a second shaft (21) located at the center and second blades (22) distributed at intervals in the circumferential direction on the circumferential surface of the second shaft (21); An upper shell (3) having a first accommodating cavity (31) for mounting the upper portion of the first blade (12), and a spray hole (32) in fluid communication with the first accommodating cavity (31) is formed on a top wall and / or a side wall of the upper shell (3); and A lower shell (4) is connected to the lower part of the upper shell (3); the upper part of the lower shell (4) has a second accommodating chamber (41) for mounting the lower part of the first blade (12); the second accommodating chamber (41) is communicated with the first accommodating chamber (31); a first water inlet (411) for supplying water into the second accommodating chamber (41) is provided on the side wall of the lower shell (4); the lower part of the lower shell (4) has a third accommodating chamber (42) for mounting the lower impeller (2); a second water inlet (421) for supplying water into the third accommodating chamber (42) and a water outlet (422) for outputting water from the third accommodating chamber (42) are provided on the side wall and / or the bottom wall of the lower shell (4); The dual-pump system is an open dual-pump system provided in the cleaning machine housing, and the upper housing constitutes the bottom spray arm structure of the cleaning machine; The upper impeller and the lower impeller rotate, and the axial flow blade at the lower part of the first blade draws water from the first water inlet into the second accommodating chamber and transports it upward to the first accommodating chamber. The water in the first accommodating chamber is sprayed out through the spray hole under the action of the upper part of the first blade; the second blade draws water from the second water inlet into the third accommodating chamber, and transports it to the water supply pipe through the water outlet in the circumferential direction. The water supply pipe transports the water flow upward to provide top and / or middle spraying for the cleaning machine.

2. The dual pump system according to claim 1, characterized in that: A partition plate (43) is provided in the middle of the lower shell (4) for separating the second accommodating chamber (41) and the third accommodating chamber (42) into relatively independent chambers.

3. The dual pump system according to claim 2, characterized in that: The third accommodating chamber (42) is located below the partition (43) and is roughly disc-shaped. The second water inlet (421) is opened on the bottom wall of the lower shell (4). The water outlet (422) is opened on the side wall of the lower shell (4) and is tangentially connected to the third accommodating chamber (42) through a guide pipe (423).

4. The dual pump system according to claim 2, characterized in that: The second accommodating chamber (41) is located above the partition (43) and extends vertically; the inner diameter of the second accommodating chamber (41) is smaller than the inner diameter of the third accommodating chamber (42) and is adapted to the lower portion of the first blade (12).

5. The dual pump system according to claim 4, characterized in that: A transversely extending ∩-shaped enclosure (431) is provided on the top wall of the partition (43), and the enclosure (431) and the partition (43) together enclose a water inlet channel (432) connected to the second accommodating chamber (41), and the outer port of the water inlet channel (432) constitutes the first water inlet (411).

6. The dual pump system according to claim 1, characterized in that: A support plate (44) extending in the radial direction is arranged on the outer peripheral wall of the upper part of the lower shell (4), and the upper shell (3) is constrained on the support plate (44).

7. The dual pump system according to claim 6, characterized in that: A clamping ring (441) is provided on the upper wall surface of the support plate (44), and a clamping foot (33) is provided on the bottom wall of the upper shell (3) and is rotatably arranged through the clamping ring (441) and is clamped and limited with the bottom wall of the clamping ring (441).

8. The dual pump system according to claim 1, characterized in that: A third water inlet (34) arranged corresponding to the first accommodating chamber (31) is formed on the bottom wall of the upper shell (3), and the third water inlet (34) is connected to the upper end of the second accommodating chamber (41).

9. The dual pump system according to claim 8, characterized in that: The diameter of the third water inlet (34) is greater than the inner diameter of the second accommodating chamber (41), and the inner diameter of the upper portion of the lower shell (4) near the upper end of the second accommodating chamber (41) gradually expands to form a guide portion (412) that can smoothly transition and connect with the inner bottom wall of the first accommodating chamber (31).

10. The dual pump system according to claim 9, characterized in that: The outer edge of the guide portion (412) is arranged close to the inner edge of the third water inlet (34), and a baffle (413) extending radially and supported on the bottom wall of the upper shell (3) is provided on the outer peripheral wall of the guide portion (412).

11. The dual pump system according to any one of claims 1 to 10, characterized in that: The upper part of the first blade (12) is a centrifugal blade, and the lower part is an axial flow blade; the second blade (22) is a centrifugal blade.

12. The dual pump system according to any one of claims 1 to 10, characterized in that: The invention also comprises a driving member (5) for driving the upper impeller (1) and the lower impeller (2) to rotate. The driving member (5) is arranged below the lower housing (4) and the output shaft (51) is arranged upward. The output shaft (51) passes through the lower housing (4) from bottom to top and extends into the first accommodating cavity (31) of the upper housing (3) and is respectively connected to the lower impeller (2) and the upper impeller (1).

13. The dual pump system according to claim 12, characterized in that: The output shaft (51) is radially limited with the upper impeller (1) and the lower impeller (2) respectively, and a nut capable of preventing the upper impeller (1) from axially moving along the output shaft (51) is provided at the upper end of the output shaft (51).

14. A cleaning machine using the dual pump system of any one of claims 1 to 13, comprising a box (6) and a water supply pipe (7) capable of conveying water at the bottom of the box (6) upward, characterized in that: The lower shell (4) is constrained on the inner bottom wall of the box body (6) and the water outlet (422) is connected to the lower end of the water supply pipe (7).

15. The cleaning machine according to claim 14, characterized in that: The water supply pipe (7) comprises a relatively independent first branch pipe (71) and a second branch pipe (72); the first branch pipe (71) is used to transport water to the middle of the box (6), and the second branch pipe (72) is used to transport water to the top of the box (6).

16. The cleaning machine according to claim 15, characterized in that: A water diverter valve (8) for controlling whether the first branch pipe (71) and the second branch pipe (72) are circulated is also provided at the bottom of the box body (6); the water inlet of the water diverter valve (8) is connected to the water outlet (422) of the lower shell body (4); the first water outlet (422) of the water diverter valve is connected to the input end of the first branch pipe (71); and the second water outlet (422) of the water diverter valve is connected to the input end of the second branch pipe (72).

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