CN216554471U - Double-pump system and cleaning machine with double-pump system - Google Patents

Abstract

The utility model relates to a double-pump system and a cleaning machine applying the same. The utility model provides an open type double-pump system, wherein a second accommodating cavity, a first accommodating cavity and an upper impeller which are positioned at the upper part supply water for spraying at the bottom, a third accommodating cavity and a lower impeller which are positioned at the lower part supply water for spraying at the top and/or the middle part, and 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, and the cleaning effect is favorably improved; the double-pump system is convenient to disassemble, assemble and clean, and bacteria are prevented from breeding; the spraying arm is arranged on the volute through the self-locking structure, the stability is good, and the spraying arm can be prevented from being separated from the volute under the non-manual operation.

Description

Double-pump system and cleaning machine with double-pump system

Technical Field

The utility model relates to the technical field of dish washing machines, in particular to a double-pump system and a cleaning machine with the double-pump system.

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, Chinese patent application publication No. CN106859563A, entitled "energy saving dishwasher" (application No. CN201611232345.5), discloses a structure including a chamber for receiving dishes and providing a washing space, a spray system for spraying water to wash the dishes, 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, for the installation of the spray arm at present, the in-place hand feeling is not obvious after the installation is finished, and the judgment on whether the spray arm is installed in place is difficult.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide a dual pump system that facilitates the connection of the spray arm with the volute, in view of the current state of the prior art.

The second technical problem to be solved by the present invention is to provide a dual pump system capable of providing power for two paths of washing water respectively, so as to improve the lift and water flow rate and further improve the cleaning effect.

A third technical problem to be solved by the present invention is to provide a dual pump system that employs an open volute to facilitate disassembly, assembly, and cleaning, in view of the current situation of the prior art.

The fourth technical problem to be solved by the present invention is to provide a cleaning machine with the above dual pump system, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a dual pump system comprising:

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 is provided with a second shaft positioned in the center and second blades which are distributed on the circumferential surface of the second shaft at intervals along the circumferential direction;

the spray arm is provided with a first accommodating cavity for mounting the upper part of the first blade, and a spray hole communicated with the first accommodating cavity is formed in the top wall and/or the side wall of the spray arm; and

the volute is connected below the spray arm, a second accommodating cavity used for installing the lower part of the first blade is formed in the upper part of the volute, a first water inlet used for enabling water to enter the second accommodating cavity is formed in the side wall of the volute, a third accommodating cavity used for installing a lower impeller is formed in the lower part of the volute, and a second water inlet used for enabling water to enter the third accommodating cavity and a water outlet used for outputting water from the third accommodating cavity are formed in the side wall and/or the bottom wall of the volute;

the spraying arm can be rotatably connected to the top wall of the volute through a self-locking structure, and the spraying arm and the volute always keep an automatic locking trend in a rotating state.

In the utility model, the outer peripheral wall of the upper part of the volute is provided with the supporting plate extending along the radial direction, the supporting plate is provided with the clamping ring which can always keep the locking trend with the supporting plate under the rotating state of the spray arm, and the bottom wall of the spray arm is provided with the clamping pin which can be rotatably arranged through the clamping ring and is clamped and limited with the bottom wall of the clamping ring, so that the spray arm is detachably connected to the top of the volute, and the disassembly and the assembly are convenient.

Preferably, the upper surface of backup pad is provided with along the spacing portion of radially extending and cross section for the #, has the breach that is close to outer end department and arranges on the first lateral wall of this spacing portion, extends to spacing portion along this breach and forms the draw-in groove, under the state that the assembly finishes, spacing portion holding is inboard at the rand, thereby be provided with on the internal perisporium of rand and slide into the draw-in groove through the breach lug of draw-in groove interference fit, this lug constitutes with the draw-in groove jointly auto-lock structure. During assembly, the clamping ring is connected with the spray arm, the clamping ring is inserted to the outer side of the limiting part, then the spray arm is rotated clockwise, the convex block slides into the clamping groove from the notch and slides into the innermost end of the clamping groove in an interference fit mode, a user can clearly feel that the assembly is in place at the moment, and the spray arm rotates clockwise when rotating and is consistent with the locking directions of the convex block and the clamping groove, so that the spray arm can be stably locked on the volute all the time and cannot be separated from the volute.

Preferably, the inner top wall of the clamping groove is formed by sequentially connecting an inclined plane gradually inclined downwards from outside to inside from the notch, a first plane which is horizontal relatively, a second plane which is lower than the first plane in height and a third plane which is flush with the first plane, and the convex block is in contact fit with the third plane and the inner side wall of the clamping groove in an assembled state. The structure is favorable for further improving the assembling stability of the spraying arm and the volute, the operation hand feeling of a user is improved, and the in-place state of the assembly can be accurately sensed.

In the above scheme, the middle part of the volute is provided with a partition plate for dividing the second accommodating cavity and the third accommodating cavity into relatively independent cavities. The second containing cavity and the third containing cavity are relatively independent, so that water supply for lower spraying through the upper impeller and water supply for top and/or middle spraying through the lower impeller are facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and jet force 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 volute, and the water outlet is formed in the side wall of the volute 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 blade. 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.

Preferably, a third water inlet arranged corresponding to the first accommodating cavity is formed in the bottom wall of the spray arm, and the third water inlet is butted with the 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 portion of the volute, close to the upper end of the second accommodating cavity, is gradually enlarged to form a guide portion 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 part 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 spraying arm is arranged on the outer peripheral wall of the guide part, 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.

In the utility model, 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.

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 disposed below the volute, the output shaft is disposed upward, and the output shaft penetrates through the volute from bottom to top to extend into the first accommodating cavity of the spray arm and is connected with the lower impeller and the upper impeller respectively. By adopting the structure, a double-pump system is constructed by adopting one power source, and the water supply condition is more conveniently controlled on the basis of simplifying the whole structure and reducing the production cost.

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 along the axial direction of the output shaft is arranged at the upper end of the output shaft. By adopting the structure, the spraying arm is convenient to disassemble and assemble, the upper impeller can be taken down after the spraying arm is taken down from the clamping ring, and the cavity on the upper part of the spraying arm, the upper impeller and the volute is cleaned, so that bacteria breeding is avoided, and the cleaning effect is improved.

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 volute 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 volute, 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.

Compared with the prior art, the utility model has the advantages that: the utility model provides an open type double-pump system, wherein a second accommodating cavity, a first accommodating cavity and an upper impeller which are positioned at the upper part supply water for spraying at the bottom, a third accommodating cavity and a lower impeller which are positioned at the lower part supply water for spraying at the top and/or the middle part, and 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, and the cleaning effect is favorably improved; the double-pump system is convenient to disassemble and assemble, the spray arm is disassembled from the volute, the spray arm, the upper impeller and the volute can be cleaned, and bacteria are prevented from breeding; the spraying arm is arranged on the volute through the self-locking structure, the stability is good, and the spraying arm can be prevented from being separated from the volute under the non-manual operation.

Drawings

FIG. 1 is a schematic 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 view of the volute of the 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 volute in an embodiment of the present invention;

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

FIG. 8 is a partial structural view of a volute according to an embodiment of the present invention;

figure 9 is an assembly view of the volute and spray arm of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

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

As shown in fig. 1 to 9, the dual pump system of the present embodiment includes an upper impeller 1, a lower impeller 2, a spray arm 3, a volute 4 and a driving member 5.

The upper impeller 1 has a first shaft 11 located at the center and a plurality of first blades 12 distributed on the circumferential surface of the first shaft 11 at intervals in the circumferential direction and extending in the axial direction, and the upper part of each first blade 12 is a centrifugal blade and the lower part thereof is an axial flow blade.

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 spray arm 3 has a body extending in a length direction, a first receiving cavity 31 for mounting an upper portion of the first blade 12 is formed in a central portion of the body, flow passages communicated with the first receiving cavity 31 are respectively formed in two sides of the body, and a spray hole 32 communicated with the flow passages is formed in a top wall of the spray arm 3.

The volute 4 is connected below the spray arm 3, the upper part of the volute 4 is provided with a second accommodating cavity 41 for mounting the lower part of the first blade 12, and the side wall of the volute 4 is provided with a first water inlet 411 for water to enter the second accommodating cavity 41; the lower part of the volute 4 is provided with a third accommodating cavity 42 for installing the lower impeller 2, the bottom wall of the volute 4 is provided with a second water inlet 421 for water to enter the third accommodating cavity 42, and the side wall of the volute 4 is provided with a water outlet 422 for water to be output from the third accommodating cavity 42.

The driving part 5 is a motor, is arranged below the volute 4, and the output shaft 51 is arranged upward, and the output shaft 51 penetrates through the volute 4 from bottom to top and extends into the first accommodating cavity 31 of the spray arm 3, and is respectively connected with the lower impeller 2 and the upper impeller 1, and is used for driving the upper impeller 1 and the lower impeller 2 to rotate.

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 volute 4. The second accommodating cavity 41 and the third accommodating cavity 42 are relatively independent, so that water supply for lower spraying through the upper impeller 1 and water supply for top and/or middle spraying through the lower impeller 2 are facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and spraying 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 volute 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 receiving cavity 41 is located above the partition plate 43 and extends vertically, and the inner diameter of the second receiving cavity 41 is smaller than the inner diameter of the third receiving cavity 42 and is adapted to the lower portion of the first blade 12. 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.

The spray arm 3 of the present embodiment is rotatably connected to the top wall of the volute 4 through the self-locking structure 100, and the spray arm 3 and the volute 4 always keep an automatic locking trend in a rotating state of the spray arm 3.

Specifically, a radially extending support plate 44 is disposed on the outer peripheral wall of the upper portion of the volute 4, a collar 441 is disposed on the support plate 44 and can always maintain a locking tendency with the support plate 44 when the spray arm 3 rotates, and a locking pin 33 is disposed on the bottom wall of the spray arm 3 and can rotatably penetrate through the collar 441 and can be locked and limited with the bottom wall of the collar 441, so that the spray arm 3 can be rotatably connected with the collar 441.

As shown in fig. 4 and 8, the upper surface of the supporting plate 44 is provided with a radially extending limiting portion 442 having a cross section of # and having a notch 443 disposed near the outer end on a first side wall of the limiting portion 442, a slot 444 is formed by extending the notch 443 into the limiting portion 442, the limiting portion 442 is accommodated inside the collar 441 in an assembled state, a protrusion 445 capable of sliding into the slot 444 through the notch 442 so as to form an interference fit with the slot 444 is disposed on an inner peripheral wall of the collar 441, and the protrusion 445 and the slot 444 together form the self-locking structure 100.

As shown in fig. 8, the inner top wall of the locking slot 444 is formed by sequentially connecting an inclined surface 400 inclined gradually downward from the outside to the inside from the notch 443, a first plane 401 that is relatively horizontal, a second plane 402 that is lower than the first plane 401, and a third plane 403 that is flush with the first plane 402, and in an assembled state, the protrusion 445 is in contact fit with the third plane 403 and the inner side wall 404 of the locking slot 444.

As shown in fig. 9, when the spray arm 3 and the scroll casing 4 are assembled, the collar 441 is connected to the spray arm 3, the collar 441 is inserted outside the limiting portion 442, and then the spray arm 3 is rotated clockwise, so that the projection 445 slides into the slot 444 from the notch 443 and slides into the innermost end of the slot 444 through interference fit, at this time, the user can clearly feel that the assembly is in place, and since the spray arm 3 rotates clockwise during rotation and the locking direction of the projection 445 and the slot 444 is the same, the spray arm 3 can be ensured to be stably locked on the scroll casing 4 all the time without being separated from the scroll casing 4.

As shown in fig. 3, a third water inlet 34 is formed on the bottom wall of the spray arm 3 and arranged corresponding to the first accommodating cavity 31, and the third water inlet 34 is butted against the upper port of the second accommodating cavity 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 portion of the volute 4 near the upper end of the second accommodating chamber 41 is gradually enlarged to form a guide part 412 which can be smoothly transitionally 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 arranged close to the inner edge of the third water inlet 34, and a baffle 413 extending along the radial direction and supported on the bottom wall of the spray arm 3 is arranged on the outer peripheral wall of the guide part 412, and the outer edge of the baffle 413 is arranged corresponding to the inner edge of the clamping foot 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 output shaft 51 of the present embodiment is radially limited to the upper impeller 1 and the lower impeller 2, respectively, and a nut capable of preventing the upper impeller 1 from moving along the axial direction of the output shaft 51 is disposed at the upper end of the output shaft 51. By adopting the structure, the spraying arm 3 is convenient to disassemble and assemble, the upper impeller 1 can be taken down after the spraying arm is taken down from the clamping ring 441, and the cavity on the upper parts of the spraying arm 3, the upper impeller 1 and the volute 4 is cleaned, so that bacteria breeding is avoided, and the cleaning effect is improved.

In this embodiment, as shown in fig. 7, the cleaning machine to which the above-mentioned 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 volute 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 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 volute 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 states of the middle-layer spraying and the top-layer spraying according to requirements, 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.

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 utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident 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, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (15)

1. A dual pump system, comprising:

an upper impeller (1) having a first shaft (11) located at the center and first blades (12) that are circumferentially spaced apart from each other on the circumferential surface of the first shaft (11) and extend in the axial direction;

a lower impeller (2) having a second shaft (21) located at the center and second blades (22) circumferentially spaced apart from each other on the circumferential surface of the second shaft (21);

the spray arm (3) is provided with a first accommodating cavity (31) for mounting the upper part of the first blade (12), and the top wall and/or the side wall of the spray arm (3) is/are provided with spray holes (32) which are communicated with the first accommodating cavity (31) in a fluid mode; and

the upper part of the volute (4) is provided with a second accommodating cavity (41) for mounting the lower part of the first blade (12), the second accommodating cavity (41) is communicated with the first accommodating cavity (31), the side wall of the volute (4) is provided with a first water inlet (411) for supplying water into the second accommodating cavity (41), the lower part of the volute (4) is provided with a third accommodating cavity (42) for mounting the lower impeller (2), and the side wall and/or the bottom wall of the volute (4) is provided with a second water inlet (421) for supplying water into the third accommodating cavity (42) and a water outlet (422) for outputting water from the third accommodating cavity (42);

the spray arm (3) can be rotatably connected to the top wall of the volute (4) through a self-locking structure (100), and the spray arm (3) and the volute (4) always keep an automatic locking trend in a rotating state of the spray arm (3).

2. The dual pump system of claim 1, wherein: the outer circumferential wall of the upper portion of the volute (4) is provided with a supporting plate (44) extending along the radial direction, a clamping ring (441) which can always keep a locking trend with the supporting plate (44) in a rotating state of the spray arm (3) is arranged on the supporting plate (44), and a clamping pin (33) which can rotatably penetrate 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 spray arm (3).

3. The dual pump system of claim 2, wherein: the upper surface of backup pad (44) is provided with along radially extending and the spacing portion (442) that the cross section is n, has on the first lateral wall of this spacing portion (442) near breach (443) that the outer tip was arranged, extends to spacing portion (442) along this breach (443) and forms draw-in groove (444), under the state of finishing assembling, spacing portion (442) holding is inboard at rand (441), thereby be provided with on the internal perisporium of rand (441) and slide into draw-in groove (444) through breach (443) and draw-in groove interference fit's lug (445), this lug (445) and draw-in groove (444) constitute auto-lock structure (100) jointly.

4. The dual pump system of claim 3, wherein: the inner top wall of the clamping groove (444) is formed by sequentially connecting an inclined plane (400) which is gradually inclined downwards from outside to inside from a notch (443), a first plane (401) which is horizontal relatively, a second plane (402) which is lower than the first plane (401) in height and a third plane (403) which is flush with the first plane (401), and under the condition of complete assembly, the lug (445) is in contact fit with the third plane (403) and the inner side wall of the clamping groove (444).

5. The dual pump system of claim 1, wherein: the middle part of the volute (4) is provided with a partition plate (43) which is used for dividing the second accommodating cavity (41) and the third accommodating cavity (42) into relatively independent cavities.

6. The dual pump system of claim 5, 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 volute (4), and the water outlet (422) is formed in the side wall of the volute (4) and is tangentially connected with the third accommodating cavity (42) through a guide pipeline (423).

7. The dual pump system of claim 5, 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 blade (12).

8. The dual pump system of claim 7, 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).

9. The dual pump system of any one of claims 1-4, wherein: and a third water inlet (34) arranged corresponding to the first accommodating cavity (31) is formed in the bottom wall of the spray arm (3), and the third water inlet (34) is butted with the upper end opening of the second accommodating cavity (41).

10. The dual pump system of claim 9, 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 volute (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).

11. The dual pump system of claim 10, 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 spray arm (3) is arranged on the outer peripheral wall of the guide part (412).

12. The dual pump system of any one of claims 1-4, wherein: the upper part of the first blade (12) is a centrifugal blade, and the lower part of the first blade is an axial flow blade; the second blade (22) is a centrifugal blade.

13. The dual pump system of any one of claims 1-4, wherein: the spraying arm is characterized by further comprising a driving part (5) for driving the upper impeller (1) and the lower impeller (2) to rotate, wherein the driving part (5) is arranged below the volute (4) and the output shaft (51) is arranged upwards, and the output shaft (51) penetrates through the volute (4) from bottom to top to extend into the first accommodating cavity (31) of the spraying arm (3) and is connected with the lower impeller (2) and the upper impeller (1) respectively.

14. The dual pump system of claim 13, wherein: 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 moving along the axial direction of the output shaft (51) is arranged at the upper end of the output shaft (51).

15. A cleaning machine using a double pump system according to any one of claims 1 to 14, 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 volute (4) is constrained 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).

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