CN214945256U - Volute structure and double-pump system of water pump, cleaning machine - Google Patents

Abstract

The utility model relates to a volute structure of water pump, volute structure of water pump includes the casing, lower casing, it has the first holding chamber that is arranged in installing first power component upper portion to go up the casing, casing upper portion has the second holding chamber that is arranged in installing first power component lower part down, lower casing side division has the first water inlet that supplies water and gets into in the second holding chamber, the lower part has the third holding chamber that is arranged in installing second power component, open the bottom of lower casing has the second water inlet that supplies water and get into in the third holding chamber, the lateral part is opened has the delivery port from third holding chamber output. The utility model provides a volute structure of an open water pump, wherein a second holding cavity and a first holding cavity supply water for bottom spraying, a third holding cavity supplies water for top and/or middle spraying, and the power of two paths of water flow is independently supplied by corresponding pumps, so that the lift and the water flow of each path of water flow are improved, and the cleaning effect is favorably improved; go up the casing and be convenient for the dismouting with lower casing, can wash last casing and lower casing, avoid bacterial growing.

Description

Volute structure and double-pump system of water pump, cleaning machine

Technical Field

The utility model relates to a dish washer technical field specifically indicates a spiral case structure of water pump and applied double pump system, the cleaning machine that has the spiral case structure of this water pump.

Background

For table type and cabinet type dish washing machines, because the washing space is large, in order to achieve better washing effect, a top spray arm, a middle spray arm and a lower spray arm are generally designed; when the dishwasher is in operation, the washing pump conveys water to the top, the middle and the lower spray arms through pipelines, the water is sprayed out of the top, the middle spray arms and the lower spray arms and washes tableware and then falls back into a water cup at the bottom of the dishwasher, and the washing pump conveys the fallen water to the top, the middle and the lower spray arms again to complete a cycle.

For example, the chinese utility model patent application publication No. CN106859563A, energy saving dishwasher (application No. CN201611232345.5), discloses a structure including a chamber 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 spraying system is arranged in the cavity; the water pumping end of the pump body is communicated with the cavity, and the water supply end is communicated with the spraying system; the spraying system comprises an inner water pipe and more than two sets of spraying devices, and the more than two sets of spraying devices are respectively arranged on the inner water pipe; the water supply end of the pump body is connected with a water distribution device, the water distribution device is provided with more than two water outlets corresponding to more than two sets of spraying devices, and the spraying devices are communicated with the corresponding water outlets; when the spraying device works, the water distribution device conducts more than one water outlet according to the instruction, so that more than one set of spraying device can perform cleaning work.

In the above-mentioned current dish washer that can carry out bottom and spray, top sprays, a pump for supplying water for the spraying system generally adopts closed structure, is about to locate the spiral case of washing pump in the box below, is provided with ability pivoted impeller in the spiral case, and the water inlet of washing pump spiral case is linked together bottom the washing chamber, and the delivery port of spiral case is connected with the water diversion device, and this water diversion device divides into the first branch road of supplying water to bottom spray arm and the second branch road of supplying water to top spray arm with rivers. Because the water pressure of the top spraying water and the water pressure of the bottom spraying water are independently supplied by the washing pump, the lift, the flow and the impact force of the water flow on each branch are greatly reduced after the water flow is divided, and the cleaning effect is influenced; meanwhile, the closed volute fixed below the box body is difficult to disassemble, assemble and clean, bacteria can be bred due to residue accumulation after long-time use, washing effect is influenced, and poor experience can be brought to users.

In addition, the volute structure of the water pump directly influences the water supply capacity of the pump, and the volute in the prior art is mature, so that the water flow lift and flow cannot be improved under the condition that the volute structure of the water pump is not changed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the current situation to prior art provides a spiral case structure that is favorable to improving the lift and the discharge of rivers and then improves the water pump of cleaning performance.

The utility model aims to solve the second technical problem to provide a double pump system who uses the spiral case structure that has above-mentioned water pump to the current situation of prior art, thereby this double pump system improves lift and discharge and then improves the cleaning performance through providing power for two way washing water alone respectively.

The utility model discloses the third technical problem that will solve is to prior art's current situation, thereby provides one kind and adopts open spiral case to be convenient for carry out dismouting and abluent double pump system.

The utility model discloses the fourth technical problem that will solve is to prior art's current situation, provides a should have the cleaning machine of above-mentioned double pump system.

The utility model provides a technical scheme that at least one above-mentioned technical problem adopted does: a volute structure for a water pump, comprising:

the upper shell is provided with a first accommodating cavity for mounting the upper part of the first power component, and the top wall and/or the side wall of the upper shell are/is provided with spray holes communicated with the first accommodating cavity in a fluid mode; and

the lower shell is connected below the upper shell, a second accommodating cavity used for installing the lower part of the first power component is formed in the upper part of the lower shell, a first water inlet used for allowing water to enter the second accommodating cavity is formed in the side part of the lower shell, a third accommodating cavity used for installing the second power component is formed in the lower part of the lower shell, a second water inlet used for allowing water to enter the third accommodating cavity is formed in the bottom of the lower shell, and a water outlet used for allowing water to be output from the third accommodating cavity is formed in the side part of the lower shell.

In the above scheme, the middle part of the lower shell is provided with a partition board for dividing the second accommodating cavity and the third accommodating cavity into relatively independent cavities. The second accommodating cavity and the third accommodating cavity are relatively independent, so that water supply for downward spraying and top and/or middle spraying is facilitated, mutual fluid disturbance is reduced, the problem of water robbing caused by suction distribution is avoided, capacity loss is reduced, and water flow lift, water flow and spraying strength are improved.

Preferably, the third accommodating cavity is located below the partition plate and is approximately disc-shaped, the second water inlet is formed in the bottom wall of the lower shell, and the water outlet is formed in the side wall of the lower shell and is tangentially connected with the third accommodating cavity through a guide pipeline. The structure is beneficial to reducing the capacity loss of the third accommodating cavity for outputting water flow.

Preferably, the second accommodating cavity is located above the partition plate and extends vertically, and the inner diameter of the second accommodating cavity is smaller than that of the third accommodating cavity and is matched with the lower part of the first power component. The structure is beneficial to reducing the capacity loss of water flow when the water flow passes through the second accommodating cavity.

Preferably, the top wall of the partition board is provided with a n-shaped coaming board extending transversely, the coaming board and the partition board jointly enclose a water inlet channel communicated with the second accommodating cavity, and an outer port of the water inlet channel forms the first water inlet. By adopting the structure, the water inlet channel is convenient to produce and manufacture, and is arranged at the bottom of the second accommodating cavity, so that the water flow disturbance is favorably reduced, and the capacity loss of the water flow flowing through the second accommodating cavity is further reduced.

For the convenience of assembly, the outer circumferential wall of the upper portion of the lower housing is provided with a support plate extending in a radial direction, and the upper housing is restrained on the support plate. The upper wall surface of the supporting plate is provided with a clamping ring, and the bottom wall of the upper shell is provided with a clamping pin which can rotatably penetrate through the clamping ring to be arranged and is clamped and limited with the bottom wall of the clamping ring, so that the upper shell is detachably connected to the top of the lower shell.

Preferably, a third water inlet arranged corresponding to the first accommodating cavity is formed in the bottom wall of the upper shell, and the third water inlet is butted with an upper port of the second accommodating cavity. The diameter of the third water inlet is larger than the inner diameter of the second accommodating cavity, and the inner diameter of the upper part of the lower shell close to the upper end of the second accommodating cavity is gradually enlarged to form a guide part which can be smoothly transited and connected with the inner bottom wall of the first accommodating cavity. The structure is beneficial to reducing the capacity loss of water flow in the process of entering the first accommodating cavity from the second accommodating cavity.

Preferably, the outer edge of the guide portion is arranged close to the inner edge of the third water inlet, a blocking piece which extends along the radial direction and is supported on the bottom wall of the upper shell is arranged on the outer peripheral wall of the guide portion, and the outer edge of the blocking piece is arranged corresponding to the inner edge of the blocking foot. The structure is favorable for improving the sealing performance of the third water inlet, and avoids water leakage from influencing the bottom spraying lift.

A dual pump system to which the volute structure of the above water pump is applied, comprising:

the volute structure of the water pump;

the upper part of the upper impeller is rotatably arranged in the first accommodating cavity and is used for dispersing water in the first accommodating cavity and spraying the water out of the spray hole; the lower part of the upper impeller is rotatably arranged in the second accommodating cavity and is used for pumping water into the second accommodating cavity through the first water inlet and conveying the water to the first accommodating cavity; and

and the lower impeller is rotatably arranged in the third accommodating cavity and is used for pumping water into the third accommodating cavity through the second water inlet and outputting the water through the water outlet.

The upper impeller is provided with a first shaft positioned in the center and first blades which are distributed on the circumferential surface of the first shaft at intervals along the circumferential direction and extend along the axial direction; the lower impeller has a second shaft located at the center and second blades circumferentially spaced on the circumferential surface of the second shaft. The upper part of the first blade is a centrifugal blade, and the lower part of the first blade is an axial flow blade; the second blade is a centrifugal blade.

The utility model provides an use cleaning machine that has above-mentioned double pump system, includes the box and can be with the water supply pipe that the water of bottom half upwards carried, its characterized in that: the lower shell is restrained on the inner bottom wall of the box body, and the water outlet is connected with the lower end of the water supply pipeline.

Preferably, the water supply pipeline is provided with a first branch pipeline and a second branch pipeline which are relatively independent, the first branch pipeline is used for conveying water flow to the middle of the box body, and the second branch pipeline is used for conveying water flow to the top of the box body. By adopting the structure, the spraying of the lower layer, the middle layer and the top layer is realized, and the cleaning effect is favorably improved.

Preferably, the bottom of the box body is further provided with a shunt valve for controlling whether the first branch pipeline and the second branch pipeline circulate or not, a water inlet of the shunt valve is connected with a water outlet of the lower shell, a first water outlet of the shunt valve is connected with an input end of the first branch pipeline, and a second water outlet of the shunt valve is connected with an input end of the second branch pipeline. The structure is convenient for controlling the use states of the middle-layer spraying and the top-layer spraying according to requirements, for example, the first branch pipeline can be closed, the second branch pipeline can be opened, and only the top-layer spraying is carried out; the first branch pipeline can be opened, the second branch pipeline can be closed, and only middle-layer spraying is carried out, so that more use requirements are met.

Preferably, the bottom of the box body is provided with a slag basket, and the first water inlet and the second water inlet are both arranged close to the slag basket. The structure is beneficial to improving the slag collecting effect.

Compared with the prior art, the utility model has the advantages of: the utility model provides a volute structure of an open water pump, wherein, a second holding cavity and a first holding cavity which are positioned at the upper part supply water for bottom spraying, and a third holding cavity which is positioned at the lower part supply water for top and/or middle spraying, because the power of two paths of water flow is independently supplied by corresponding pumps, the lift and the water flow of each path of water flow are improved, which is beneficial to improving the cleaning effect; moreover, the upper shell and the lower shell are convenient to disassemble and assemble, the upper shell is disassembled from the lower shell, the upper shell and the lower shell can be cleaned, and bacteria breeding is avoided.

Drawings

Fig. 1 is a schematic structural diagram of a dual pump system according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another angle;

FIG. 3 is a cross-sectional view of a dual pump system according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a lower housing in an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 from another angle;

fig. 6 is a cross-sectional view of a lower housing in an embodiment of the invention;

FIG. 7 is a schematic structural view of a cleaning machine according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a volute structure of a water pump according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The volute structure of the water pump of this embodiment is applicable to the double pump system, can provide the pump system of two-way power, and the double pump system can be applied to in the great dish washer of volume, sprays for the bottom, sprays and/or the middle part sprays the water supply, certainly also is not limited to this service environment.

As shown in fig. 1 to 8, the volute structure of the water pump of the present embodiment includes an upper housing 3 and a lower housing 4, the upper housing 3 has a body extending in a length direction, a first accommodating cavity 31 is formed in a central portion of the body for installing an upper portion of a first power component, flow passages communicating with the first accommodating cavity 31 are respectively formed on two sides of the body, and a nozzle hole 32 communicating with the flow passages is formed on a top wall of the upper housing 3. The lower shell 4 is connected below the upper shell 3, the upper part of the lower shell 4 is provided with a second accommodating cavity 41 for installing the lower part of the first power component, the second accommodating cavity 41 is correspondingly communicated with the first accommodating cavity 31, and the side part of the lower shell 4 is provided with a first water inlet 411 for water to enter the second accommodating cavity 41; the lower part of the lower shell 4 is provided with a third accommodating cavity 42 for installing a second power component, the bottom of the lower shell 4 is provided with a second water inlet 421 for water to enter the third accommodating cavity 42, and the side part of the lower shell 4 is provided with a water outlet 422 for water to be output from the third accommodating cavity 42.

Specifically, as shown in fig. 3 and 6, a partition plate 43 for dividing the second accommodating chamber 41 and the third accommodating chamber 42 into relatively independent chambers is disposed in the middle of the lower housing 4. The second accommodating cavity 41 and the third accommodating cavity 42 are relatively independent, so that independent water supply for bottom spraying, top spraying and/or middle spraying is facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and jet force are improved.

The third accommodating cavity 42 is located below the partition plate 43 and is approximately disc-shaped, the second water inlet 421 is arranged at the center of the bottom wall of the lower shell 4, and the water outlet 422 is tangentially connected with the third accommodating cavity 42 through the guide pipeline 423, so that the structure is favorable for reducing the capacity loss of the third accommodating cavity 42 in outputting water flow.

The second accommodating chamber 41 is located above the partition 43 and extends vertically, and 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 power component. This configuration is advantageous in reducing the loss of water flow through the second receiving chamber 41.

As shown in fig. 4, 5 and 6, the top wall of the partition 43 is provided with a n-shaped skirt 431 extending transversely, the skirt 431 and the partition 43 together define a water inlet passage 432 communicating with the second receiving chamber 41, and an outer port of the water inlet passage 432 forms the first water inlet 411. By adopting the structure, the production and the manufacture are convenient, and the water inlet channel 432 is arranged at the bottom of the second accommodating cavity 41, so that the disturbance of water flow is reduced, and the capacity loss of the water flow flowing through the second accommodating cavity 42 is further reduced.

For ease of assembly, the outer peripheral wall of the upper portion of the lower case 4 is provided with a support plate 44 extending in the radial direction, and the upper case 3 is restrained on the support plate 44. A clamping ring 441 is arranged on the upper wall surface of the supporting plate 44, and a clamping pin 33 which can be rotatably arranged through the clamping ring 441 and is clamped and limited with the bottom wall of the clamping ring 441 is arranged 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.

As shown in fig. 3, a third water inlet 34 is formed on the bottom wall of the upper housing 3 and arranged corresponding to the first accommodating chamber 31, and the third water inlet 34 is butted against the upper port 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 housing 4 near the upper end of the second accommodating chamber 41 is gradually enlarged to form a guide part 412 which can be smoothly transited and connected with the inner bottom wall of the first accommodating chamber 31. This structure is advantageous for reducing the loss of the water flow in the process of entering the first accommodation chamber 31 from the second accommodation chamber 41. The outer edge of the guide part 412 is disposed close to the inner edge of the third water inlet 34, and a stopper 413 extending in the radial direction and supported on the bottom wall of the upper housing 3 is disposed on the outer peripheral wall of the guide part 412, and the outer edge of the stopper 413 is disposed corresponding to the inner edge of the locking leg 33. This structure is favorable to improving the leakproofness of third inlet 34 department, avoids rivers to leak and influences the lift that the bottom sprays.

The double-pump system of the embodiment comprises the volute structure of the water pump, an upper impeller 1, a lower impeller 2 and a driving part 5, wherein the upper impeller 1 is provided with a first shaft 11 positioned at the center and a plurality of first blades 12 which are distributed on the circumferential surface of the first shaft 11 at intervals along the circumferential direction and extend along the axial direction, the upper parts of the first blades 12 are centrifugal blades, and the lower parts of the first blades 12 are axial flow blades. The lower impeller 2 includes a second shaft 21 located at the center and a plurality of second blades 22 circumferentially spaced apart from each other on the circumferential surface of the second shaft 21, and the second blades 22 are centrifugal blades. The upper part of the upper impeller 1 is rotatably arranged in the first accommodating cavity 31 and is used for dispersing water in the first accommodating cavity 31 and spraying the water out of the spraying hole 32; the lower portion of the upper impeller 1 is rotatably disposed in the second receiving chamber 41, and is used for drawing water into the second receiving chamber 41 through the first water inlet 411 and conveying the water to the first receiving chamber 31. The lower impeller 2 is rotatably disposed in the third accommodating chamber 42, and is used for drawing water into the third accommodating chamber 42 through the second water inlet 421 and outputting the water through the water outlet 422. The driving part 5 is used for driving the upper impeller 1 and the lower impeller 2 to rotate.

In this embodiment, as shown in fig. 7, the cleaning machine to which the above-described dual pump system is applied includes a tank 6 and a water supply pipe 7 capable of supplying water from the bottom of the tank 6 upward, the lower housing 4 is constrained on the inner bottom wall of the tank 6, and the water outlet 422 is connected to the lower end of the water supply pipe 7.

The driving member 5 is a motor, and is disposed at the outer bottom of the box 6, and the output shaft 51 is disposed upward, and the output shaft 51 passes through the box 6 and the second water inlet 421 from bottom to top, extends into the first accommodating cavity 31 of the upper housing 3, and is connected with the lower impeller 2 and the upper impeller 1 respectively, so as to drive the upper impeller 1 and the lower impeller 2 to rotate. The output shaft 51 is respectively limited with the upper impeller 1 and the lower impeller 2 in the radial direction, and the upper end of the output shaft 51 is provided with a nut which can prevent the upper impeller 1 from moving along the axial direction of the output shaft 51. By adopting the structure, the upper shell 3 is convenient to disassemble and assemble, the upper impeller 1 can be taken down after the upper shell 3 is taken down from the clamping ring 441, and the cavity on the upper parts of the upper shell 3, the upper impeller 1 and the lower shell 4 is cleaned, so that bacteria breeding is avoided, and the cleaning effect is improved.

The water supply pipeline 7 is provided with a first branch pipeline 71 and a second branch pipeline 72 which are relatively independent, the first branch pipeline 71 is used for conveying water flow to the middle of the box body, and the second branch pipeline 72 is used for conveying water flow to the top of the box body. By adopting the structure, the spraying of the lower layer, the middle layer and the top layer is realized, and the cleaning effect is favorably improved.

The bottom of the box 6 is further provided with a shunt valve 8 for controlling whether the first branch pipeline 71 and the second branch pipeline 72 circulate, a water inlet of the shunt valve 8 is connected with a water outlet 422 of the lower shell 4, a first water outlet of the shunt valve 8 is connected with an input end of the first branch pipeline 71, and a second water outlet of the shunt valve 8 is connected with an input end of the second branch pipeline 72. The structure is convenient for controlling the use state of the middle-layer and top-layer spraying according to the requirement, for example, the first branch pipeline 71 can be closed, the second branch pipeline 72 can be opened, and only the top-layer spraying is carried out; the first branch pipeline 71 can be opened, the second branch pipeline 72 can be closed, and only middle-layer spraying is carried out, so that more use requirements can be met.

Above-mentioned 6 bottoms of box are provided with sediment basket 9, and first water inlet 411 is close to sediment basket 9 and arranges that this structure is favorable to improving the sediment effect of collection.

After the assembly is finished, a space is reserved between the bottom wall of the volute structure of the water pump and the bottom wall of the box body 6, so that the second water inlet 421 is exposed, the structure of the second water inlet 421 and the assembly mode of the second water inlet and the box body 6 enable the bottom of the volute to form an annular suction structure, and the structure is beneficial to ensuring a larger water passing area under a small enough assembly distance from the bottom of the box body, reducing the flow speed and reducing the kinetic energy loss; meanwhile, the structure can wash the bottom of the volute when water flows, and residue is reduced. In order to improve the water absorption effect, the first water inlet 411 may be connected with a suction nozzle 4110 extending downward to the vicinity of the slag basket 9. The volute structure of this embodiment water pump has better rivers stability on the whole, has that the water level that absorbs water is low, the water efficiency is low, characteristics that rivers energy loss is little.

When the water pump is used, the output shaft 51 of the driving part 5 rotates to drive the upper impeller 1 and the lower impeller 2 to rotate, the axial flow blades at the lower part of the first blades 12 suck water into the second accommodating cavity 41 from the first water inlet 411 and convey the water upwards into the first accommodating cavity 31, and the water in the first accommodating cavity 31 is sprayed out through the spray holes 32 under the action of the upper part of the first blades 12; the second blade 22 sucks water from the second water inlet 421 into the third accommodating chamber 42, and conveys the water to the water supply pipeline 7 through the water outlet 422 along the guide pipeline 423 in the circumferential direction, and the water supply pipeline 7 conveys the water upwards for top and/or middle spraying.

Directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the present invention, but these terms are used herein for convenience of description only and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to orientations opposite or consistent with the direction of gravity.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.

Claims (15)

1. The utility model provides a spiral case structure of water pump which characterized in that: comprises that

The upper shell (3) is provided with a first accommodating cavity (31) for mounting the upper part of a first power component, and the top wall and/or the side wall of the upper shell (3) is/are provided with spray holes (32) which are communicated with the first accommodating cavity (31) in a fluid mode; and

lower casing (4), connect in the below of last casing (3), the upper portion of lower casing (4) has second holding chamber (41) that is arranged in the first power component lower part of installation, the lateral part of lower casing (4) is opened has first water inlet (411) that supplies water to get into in second holding chamber (41), the lower part of lower casing (4) has third holding chamber (42) that are used for installing second power component, open the bottom of lower casing (4) has second water inlet (421) that supplies water to get into in third holding chamber (42), open the lateral part of lower casing (4) has delivery port (422) that supplies water from third holding chamber (42) output.

2. The volute structure of a water pump of claim 1, wherein: and a partition plate (43) used for dividing the second accommodating cavity (41) and the third accommodating cavity (42) into relatively independent cavities is arranged in the middle of the lower shell (4).

3. The volute structure of a water pump of claim 2, wherein: the third accommodating cavity (42) is located below the partition plate (43) and is approximately disc-shaped, the second water inlet (421) is formed in the bottom wall of the lower shell (4), and the water outlet (422) is formed in the side wall of the lower shell (4) and is tangentially connected with the third accommodating cavity (42) through a guide pipeline (423).

4. The volute structure of a water pump of claim 2, wherein: the second accommodating cavity (41) is located above the partition plate (43) and extends vertically, and the inner diameter of the second accommodating cavity (41) is smaller than that of the third accommodating cavity (42) and is matched with the lower portion of the first power component.

5. The volute structure of a water pump of claim 4, wherein: the n-shaped coaming (431) transversely extending is arranged on the top wall of the partition plate (43), a water inlet channel (432) communicated with the second accommodating cavity (41) is formed by the coaming (431) and the partition plate (43) in a surrounding mode, and the outer port of the water inlet channel (432) forms the first water inlet (411).

6. The volute structure of a water pump of claim 2, wherein: the outer peripheral wall of the upper portion of the lower casing (4) is provided with a support plate (44) extending in the radial direction, and the upper casing (3) is restrained on the support plate (44).

7. The volute structure of a water pump of claim 6, wherein: be provided with rand (441) on the upper wall of backup pad (44), be provided with on the diapire of last casing (3) and pass rand (441) with rotating and arrange and with rand (441) diapire looks joint spacing card foot (33).

8. The volute structure of a water pump of claim 1, wherein: and a third water inlet (34) arranged corresponding to the first accommodating cavity (31) is formed in the bottom wall of the upper shell (3), and the third water inlet (34) is butted with the upper end opening of the second accommodating cavity (41).

9. The volute structure of a water pump of claim 8, wherein: the diameter of the third water inlet (34) is larger than the inner diameter of the second accommodating cavity (41), and the inner diameter of the upper part of the lower shell (4) close to the upper end of the second accommodating cavity (41) is gradually enlarged to form a guide part (412) which can be smoothly transited and connected with the inner bottom wall of the first accommodating cavity (31).

10. The volute structure of a water pump of claim 9, wherein: the outer edge of the guide part (412) is close to the inner edge of the third water inlet (34), and a blocking piece (413) which extends along the radial direction and is supported on the bottom wall of the upper shell (3) is arranged on the outer peripheral wall of the guide part (412).

11. A dual pump system using a volute structure of a water pump according to any one of claims 1 to 10, wherein: comprises that

The volute structure of the water pump;

the upper part of the upper impeller (1) is rotatably arranged in the first accommodating cavity (31) and is used for dispersing water in the first accommodating cavity (31) and spraying the water out of the spray hole (32); the lower part of the upper impeller (1) is rotatably arranged in the second accommodating cavity (41) and is used for drawing water into the second accommodating cavity (41) through the first water inlet (411) and conveying the water to the first accommodating cavity (31); and

and the lower impeller (2) is rotatably arranged in the third accommodating cavity (42) and is used for drawing water into the third accommodating cavity (42) through the second water inlet (421) and outputting the water through the water outlet (422).

12. A cleaning machine using the double pump system of claim 11, comprising a tank (6) and a water supply pipe (7) for supplying water from the bottom of the tank (6) upwards, characterized in that: the lower shell (4) is restricted on the inner bottom wall of the box body (6) and the water outlet (422) is connected with the lower end of the water supply pipeline (7).

13. The cleaning machine of claim 12, wherein: the water supply pipeline (7) is internally provided with a first branch pipeline (71) and a second branch pipeline (72) which are relatively independent, the first branch pipeline (71) is used for conveying water flow to the middle of the box body (6), and the second branch pipeline (72) is used for conveying water flow to the top of the box body (6).

14. The cleaning machine of claim 13, wherein: the bottom of the box body (6) is also provided with a shunt valve (8) used for controlling whether the first branch pipeline (71) and the second branch pipeline (72) circulate or not, a water inlet of the shunt valve (8) is connected with a water outlet (422) of the lower shell (4), a first water outlet (422) of the shunt valve is connected with the input end of the first branch pipeline (71), and a second water outlet (422) of the shunt valve is connected with the input end of the second branch pipeline (72).

15. The cleaning machine of claim 12, wherein: the bottom of the box body (6) is provided with a slag basket (9), and the first water inlet (411) and the second water inlet (421) are both arranged close to the slag basket (9).

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