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

Abstract

The present invention relates to a volute structure of a water pump and its application. The volute structure of the water pump includes an upper housing and a lower housing. The upper housing has a first accommodation cavity for installing the upper part of the first power component. The upper part of the lower housing has a second accommodation cavity for installing the lower part of the first power component. A first water inlet for water to enter the second accommodation cavity is provided on the side of the lower housing, and a third accommodation cavity for installing the second power component is provided at the lower part of the lower housing. A second water inlet for water to enter the third accommodation cavity is provided at the bottom of the lower housing, and a water outlet for output from the third accommodation cavity is provided on the side. The present invention provides a volute structure of an open water pump. The second accommodation cavity and the first accommodation cavity supply water by bottom spraying, and the third accommodation cavity supplies water by top and / or middle spraying. The power of the two-way water flow is independently supplied by the corresponding pumps, which improves the head and water flow of each water flow and is beneficial to improving the cleaning effect. The upper housing and the lower housing are convenient for disassembly and assembly, and the upper housing and the lower housing can be cleaned to avoid bacterial growth.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and specifically to a volute structure of a water pump, a dual-pump system applying the volute structure of the water pump, and a cleaning machine. Background Art

[0002] For tabletop and cabinet dishwashers, due to their large washing space, in order to achieve better washing effects, generally three spray arms, namely a top spray arm, a middle spray arm, and a bottom spray arm, are designed; during operation, the washing pump conveys water through pipelines to the top, middle, and bottom spray arms, the water sprays out from the top, middle, and bottom spray arms and rinses the tableware, and then falls back into the water cup at the bottom of the dishwasher, and the washing pump conveys the fallen water to the top, middle, and bottom spray arms again to complete a cycle.

[0003] For example, the Chinese patent application "Energy-saving Dishwasher" (application number: CN201611232345.5) with the publication number of CN106859563A discloses a structure, which includes a cavity for accommodating tableware and providing a cleaning space, a spraying system for spraying water to clean the tableware, and a pump body for pumping water and supplying water to the spraying system; the spraying system is arranged in the cavity; the water intake end of the pump body communicates with the cavity, and the water supply end communicates with the spraying system; the spraying system includes 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; a water distribution device is connected to the water supply end of the pump body, and the water distribution device is provided with more than two water outlets corresponding to the more than two sets of spraying devices, and the spraying devices communicate with the corresponding water outlets; during operation, the water distribution device conducts one or more water outlets according to instructions to enable one or more sets of spraying devices to perform cleaning work.

[0004] In the above-mentioned existing dishwashers that can perform bottom spraying and top spraying, the pump for supplying water to the spraying system generally adopts a closed structure, that is, the volute of the washing pump is arranged below the box body, an impeller that can rotate is arranged in the volute, the water inlet of the volute of the washing pump is communicated with the bottom of the washing cavity, and a water distribution device is connected to the water outlet of the volute. The water distribution device 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 for top spraying and bottom spraying is 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 box body is difficult to disassemble and clean, and bacteria will breed due to residue accumulation after long-term use, which not only affects the washing effect but also brings a bad experience to users.

[0005] In addition, the volute structure of the water pump directly affects the water supply capacity of the pump, and the volute in the prior art is already relatively mature, and it is impossible to increase the water head and flow rate of the water flow without changing the volute structure of the water pump. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a volute structure of a water pump that is conducive to increasing the lift and water flow rate of water, thereby improving the cleaning effect.

[0007] The second technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a double-pump system applying the above-mentioned volute structure of the water pump. The double-pump system provides power for two-way washing water separately, thereby increasing the lift and water flow rate and improving the cleaning effect.

[0008] The third technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a double-pump system adopting an open volute, which is convenient for disassembly, assembly and cleaning.

[0009] The fourth technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a cleaning machine applying the above-mentioned double-pump system.

[0010] The technical solution adopted by the present invention to solve at least one of the above technical problems is as follows: A volute structure of a water pump, characterized by comprising

[0011] an upper housing having a first accommodating cavity for installing the upper part of the first power component, and spray holes communicating with the first accommodating cavity are opened on the top wall and / or side wall of the upper housing; and

[0012] a lower housing connected below the upper housing. The upper part of the lower housing has a second accommodating cavity for installing the lower part of the first power component. The second accommodating cavity is communicated with the first accommodating cavity. A first water inlet for water to enter the second accommodating cavity is opened on the side of the lower housing. The lower part of the lower housing has a third accommodating cavity for installing the second power component. A second water inlet for water to enter the third accommodating cavity is opened on the bottom wall of the lower housing. A guide ring with a side opening is arranged around the second water inlet on the bottom wall of the lower housing. The opening of the guide ring is located beside the first water inlet. A water outlet for water to output from the third accommodating cavity is opened on the side of the lower housing.

[0013] In the above solution, the opening of the guide ring is located at the bottom edge of the lower housing. The first end of the guide ring forms a first guide arc segment arched inward towards the opening near the opening. The second end of the guide ring forms a second guide arc segment arched inward towards the opening near the opening, and the circular arc radius corresponding to the second guide arc segment is smaller than the circular arc radius corresponding to the first guide arc segment. This structure is conducive to rectifying and guiding the incoming water and reducing energy loss on the basis of enclosing a water absorption area.

[0014] Preferably, a diversion channel extending obliquely downward is provided on the side of the lower housing. The lower port of the diversion channel forms the first water inlet, and the first water inlet is arranged adjacent to the open end. This structure concentrates the two water inlets together and controls the water suction inlet at a very low position, which not only makes it easy for the water pump to start but also avoids the problem of air inhalation. In addition, in the present invention, the water inlet is arranged corresponding to the side wall of the dishwasher slag basket, which can improve the slag collection effect by means of the water suction force, and at the same time wash the bottom of the volute and the side wall of the slag basket to keep them clean.

[0015] Preferably, a partition for separating the second accommodation cavity and the third accommodation cavity into relatively independent cavities is provided in the middle of the lower housing. The diversion channel is located above the partition and extends downward along the periphery of the partition from top to bottom. Making the second accommodation cavity and the third accommodation cavity relatively independent is convenient for supplying water to the lower spray, top and / or middle spray respectively, reducing the fluid disturbance between them, avoiding the "water robbing" problem caused by suction distribution, reducing the energy loss, and thus improving the water flow head, water flow rate and spraying force.

[0016] Preferably, the lower edge of the diversion channel is substantially aligned with the diversion ring, and an arc-shaped diversion plate extending obliquely downward is provided on the outer side wall of the lower housing in the diversion channel, so that the width of the flow channel at the first water inlet gradually decreases from top to bottom. This structure is beneficial to increasing the water flow velocity, thereby increasing the water flow power.

[0017] Preferably, the cross-section of the diversion channel forms a smooth curved ︵-shaped structure at the outer edge corresponding to the partition. This structure is beneficial to further reducing the energy loss.

[0018] More preferably, an upwardly arched arc-shaped notch is formed at the outer edge of the lower port of the diversion channel, and the arc-shaped notch forms the water inlet of the diversion channel. In the assembled state, the bottom edges of the above-mentioned diversion ring and the diversion channel are both in contact with the inner bottom wall of the dishwasher. By providing the above-mentioned arc-shaped notch for water flow inhalation, the water suction inlet is controlled at a very low position, which not only makes it easy for the water pump to start but also avoids the problem of air inhalation. In addition, in the present invention, the water inlet is arranged corresponding to the side wall of the dishwasher slag basket, which can improve the slag collection effect by means of the water suction force, and at the same time wash the bottom of the volute and the side wall of the slag basket to keep them clean.

[0019] Preferably, the third accommodating chamber is roughly disc-shaped, the second accommodating chamber is located above the partition and extends vertically, the diameter of the lower port of the second accommodating chamber is smaller than the diameter of the third accommodating chamber, a circular area corresponding to the lower port of the second accommodating chamber is arranged on the upper wall surface of the partition, and the diversion channel has a first side wall and a second side wall tangentially connected to the outer edge of the circular area, the first side wall and the second side wall are arranged oppositely and the distance between them gradually decreases along the flow direction of the water. This structure is conducive to pressurizing the water flow during the water diversion process to increase the head, and the tangential connection method is conducive to reducing energy loss.

[0020] Preferably, the water outlet is opened 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.

[0021] Preferably, the second accommodating chamber is divided into a first section, a second section and a third section from bottom to top along the direction of water flow, the first section is arranged corresponding to the guide channel, the second section is smoothly connected to the first section and the inner diameter is gradually reduced, and the third section is smoothly connected to the second section and the inner diameter is gradually expanded. The upper end of the guide channel is arranged corresponding to the second section and the third section and has a smooth transition at the connection. The above structure is conducive to cooperating with the corresponding impeller to improve the water flow extraction effect, thereby increasing the head and water flow.

[0022] Preferably, a third water inlet corresponding to the first accommodating chamber is formed on the bottom wall of the upper shell, and the third water inlet is connected to the upper end of the third section of the second accommodating chamber, and the third section constitutes a guide portion for smoothly transitioning the inner wall of the second accommodating chamber to the inner bottom wall of the first accommodating chamber, and the outer edge of the guide portion is arranged close to the inner edge of the third water inlet. 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.

[0023] 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.

[0024] 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.

[0025] A dual pump system using the volute structure of the water pump comprises:

[0026] The volute structure of the water pump described above;

[0027] An upper impeller, the upper part of which is rotatably arranged in the first accommodating cavity for dispersing the water in the first accommodating cavity and spraying it out from the spray holes; the lower part of the upper impeller is rotatably arranged in the second accommodating cavity for sucking water into the second accommodating cavity through the first water inlet and conveying it to the first accommodating cavity; and

[0028] A lower impeller, which is rotatably arranged in the third accommodating cavity for sucking water into the third accommodating cavity through the second water inlet and outputting it through the water outlet.

[0029] Preferably, the lower impeller includes a shaft located at the center, an end cover gradually extending radially outward from the upper part of the shaft, and blades arranged on the lower wall surface of the end cover. In the assembled state, the end cover is arranged close to the inner top wall of the third accommodating cavity, and the lower edge of the blade is close to the second water inlet.

[0030] A cleaning machine applying the above double-pump system, including a box body and a water supply pipe capable of conveying the water at the bottom of the box body upward, characterized in that: the lower shell is constrained on the inner bottom wall of the box body, and the water outlet is connected to the lower end of the water supply pipe.

[0031] Preferably, the water supply pipe has relatively independent first branch pipes and second branch pipes. The first branch pipe is used for conveying water flow to the middle part of the box body, and the second branch pipe is used for conveying water flow to the top of the box body. With such a structure, spraying on the lower layer, middle layer, and top layer is realized, which is beneficial to improving the cleaning effect.

[0032] Preferably, a water distribution valve for controlling the flow of the first branch pipe and the second branch pipe is further arranged at the bottom of the box body. The water inlet of the water distribution valve is connected to the water outlet of the lower shell, the first water outlet of the water distribution valve is connected to the input end of the first branch pipe, and the second water outlet of the water distribution valve is connected to the input end of the second branch pipe. This structure facilitates controlling the use states of spraying on the middle layer and the top layer as needed. For example, the first branch pipe can be closed and the second branch pipe can be opened for only top-layer spraying; or the first branch pipe can be opened and the second branch pipe can be closed for only middle-layer spraying to meet more usage requirements.

[0033] Preferably, a slag basket is arranged at the bottom of the box body, and both the first water inlet and the open mouth are arranged close to the slag basket. This structure is beneficial to improving the slag collection effect.

[0034] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides a volute structure of an open-type water pump. Among them, the second accommodation cavity and the first accommodation cavity located in the upper part supply water for bottom spraying, and the third accommodation cavity located in the lower part supplies water for top and / or middle spraying. Since the power of the two water flows is independently supplied by the corresponding pumps, the lift and water flow rate of each water flow are improved, which is beneficial to improving the cleaning effect. Moreover, the upper housing and the lower housing are easy to disassemble and assemble. By removing the upper housing from the lower housing, the upper housing and the lower housing can be cleaned to avoid the growth of bacteria. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. is a schematic diagram of the volute structure of the water pump according to an embodiment of the present invention;

[0036] Figure 2 is Figure 1 a cross-sectional view of;

[0037] Figure 3 FIG. is a schematic diagram of the structure of the lower housing according to an embodiment of the present invention;

[0038] Figure 4 is Figure 3 a bottom structure diagram of;

[0039] Figure 5 is Figure 3 a cross-sectional view of;

[0040] Figure 6 is Figure 3 another cross-sectional view of;

[0041] Figure 7 FIG. is a schematic diagram of the structure of a dual-pump system according to an embodiment of the present invention;

[0042] Figure 8 is Figure 7 a cross-sectional view of;

[0043] Figure 9 FIG. is a partial structure diagram of a cleaning machine according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following further describes the present invention in detail with reference to the embodiments of the drawings.

[0045] The volute structure of the water pump in this embodiment is applicable to a dual-pump system, that is, a pump system that can provide bidirectional power. The dual-pump system can be applied to a dishwasher with a relatively large volume to supply water for bottom spraying, top spraying, and / or middle spraying. Of course, it is not limited to this usage environment.

[0046] Such as Figures 1 to 8As shown in the figure, the volute structure of the water pump in this embodiment includes an upper housing 3 and a lower housing 4. The upper housing 3 has a body extending in the length direction. The central part of the body has a first accommodation cavity 31 for installing the upper part of the first power component. Flow channels communicating with the first accommodation cavity 31 are respectively provided on both sides of the body. Spray holes 32 communicating with the flow channels are formed on the top wall of the upper housing 3. The lower housing 4 is connected below the upper housing 3. The upper part of the lower housing 4 has a second accommodation cavity 41 for installing the lower part of the first power component. The second accommodation cavity 41 communicates with the first accommodation cavity 31 correspondingly. A first water inlet 411 for water to enter the second accommodation cavity 41 is formed on the side of the lower housing 4. The lower part of the lower housing 4 has a third accommodation cavity 42 for installing the second power component. A second water inlet 421 for water to enter the third accommodation cavity 42 is formed on the bottom wall of the lower housing 4. A guide ring 420 with a side opening and arranged around the second water inlet 421 is further provided on the bottom wall of the lower housing 4. The opening 4200 of the guide ring 420 is located beside the first water inlet 411. A water outlet 422 for water to output from the third accommodation cavity 42 is formed on the side of the lower housing 4.

[0047] A partition 43 for separating the second accommodation cavity 41 and the third accommodation cavity 42 into relatively independent cavities is arranged in the middle of the lower housing 4 described above. Making the second accommodation cavity 41 and the third accommodation cavity 42 relatively independent is convenient for supplying water for lower spraying, top and / or middle spraying respectively, reducing the fluid disturbance between them, avoiding the "water robbing" problem caused by suction distribution, reducing the energy loss, so as to improve the water flow head, water flow rate and spraying force.

[0048] Specifically, the opening 4200 of the guide ring 420 is located at the bottom edge of the lower housing 4. The first end of the guide ring 420 forms a first guide arc segment 4201 arching towards the inside of the opening 4200 near the opening 4200. The second end of the guide ring 420 forms a second guide arc segment 4202 arching towards the inside of the opening 4200 near the opening 4200. And the circular arc radius corresponding to the second guide arc segment 4202 is smaller than the circular arc radius corresponding to the first guide arc segment 4201. The first guide arc segment 4201 is arranged close to the first water inlet 411. This structure is beneficial to rectify and guide the incoming water on the basis of enclosing the water absorption area, reducing the energy loss.

[0049] A guide channel 413 extending obliquely downward is provided on the side of the lower housing 4 in this embodiment. The lower port of the guide channel 413 forms the first water inlet 411 for water to enter the second accommodation cavity 41. The guide channel 413 is located above the partition 42 and extends downward along the periphery of the partition 42 from top to bottom so that the first water inlet 411 is arranged close to the bottom edge of the lower housing 4. The first water inlet 411 is arranged adjacent to the opening 4200. This structure is beneficial to reducing the height of the water suction port, avoiding inhaling air, and enabling the pump to quickly suck water.

[0050] The lower edge of the above-mentioned diversion channel 413 is substantially aligned with the diversion ring 420. An arc-shaped diversion plate 4130 is provided on the outer sidewall of the lower housing 4 inside the diversion channel 413, which extends obliquely downward so that the width of the flow channel at the first water inlet 411 gradually decreases from top to bottom. This structure is beneficial to increasing the water flow velocity, thereby increasing the water flow power.

[0051] The third accommodation cavity 42 of this embodiment is generally disc-shaped. The second accommodation cavity 41 is located above the partition 43 and extends vertically. The diameter of the lower port of the second accommodation cavity 41 is smaller than the diameter of the third accommodation cavity 42. A circular area 400 corresponding to the lower port of the second accommodation cavity 41 is provided on the upper wall surface of the partition 43. The diversion channel 413 has a first sidewall 4133 and a second sidewall 4134 that are tangentially connected to the outer edge of the circular area 400. The first sidewall 4133 and the second sidewall 4134 are arranged opposite to each other and the distance between the two gradually decreases along the water flow direction, so that the diversion channel 413 is a V-shaped structure when viewed from above. This structure is beneficial to pressurizing the water flow during the water diversion process to increase the lift, and the tangential connection method is beneficial to reducing energy loss.

[0052] An arc-shaped notch 4136 that arches upward is formed at the outer edge of the lower port of the above-mentioned diversion channel 413. This arc-shaped notch 4136 constitutes the water inlet of the diversion channel 413. In the assembled state, the bottom edges of the above-mentioned diversion ring 420 and the diversion channel 413 are both in contact with the inner bottom wall of the dishwasher. By setting the above-mentioned arc-shaped notch 4136 to suck in water flow and controlling the water suction inlet at a very low position, not only is the water pump easy to start, but also the problem of sucking in air is avoided; in addition, in this embodiment, the above-mentioned water inlet is arranged corresponding to the sidewall of the dishwasher slag basket 9, which can improve the slag collection effect by means of this water suction force, and at the same time wash the bottom of the volute and the sidewall of the slag basket 9 to keep it clean.

[0053] The cross-section of the above-mentioned diversion channel 413 forms a smoothly curved ︵-shaped structure 4135 at the outer edge corresponding to the partition 43. This structure is beneficial to further reducing energy loss.

[0054] The water outlet 422 of this embodiment is opened on the sidewall of the lower housing 4 and is tangentially connected to the third accommodation cavity 42 through a guiding pipe 423. This structure is beneficial to reducing the energy loss of the water flow output by the third accommodation cavity.

[0055] The second accommodating chamber 41 of this embodiment is divided into a first section 41a, a second section 41b and a third section 41c from bottom to top along the direction of water flow. The first section 41a corresponds to the outer periphery of the circular area 400, the second section 41b is smoothly connected to the first section 41a and the inner diameter gradually decreases, and the third section 41c is smoothly connected to the second section 41b and the inner diameter gradually increases. The upper end of the guide channel 413 corresponds to the side arrangement of the second section 41b and the third section 41c and has a smooth transition at the connection. The above structure is conducive to cooperating with the corresponding impeller to improve the water flow extraction effect, thereby increasing the head and water flow.

[0056] In this embodiment, the bottom wall of the upper shell 3 is provided with a third water inlet 34 arranged corresponding to the first accommodating chamber 31, and the third water inlet 34 is connected to the upper end of the third section 41c of the second accommodating chamber 41, and the third section 41c constitutes a guide portion for smoothly transitioning the inner wall of the second accommodating chamber 41 and the inner bottom wall of the first accommodating chamber 31, and the outer edge of the guide portion is arranged close to the inner edge of the third water inlet 34. 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.

[0057] 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.

[0058] The dual pump system of this embodiment includes the volute structure of the water pump, the upper impeller 1, the lower impeller 2 and the driving member 5. The upper impeller 1 has a first axis located in the center and a plurality of first blades spaced circumferentially and extending axially on the circumference of the first axis. The upper part of the first blade is a centrifugal blade and the lower part is an axial flow blade. The upper part of the upper impeller 1 is rotatably arranged in the first accommodating chamber 31, and is used to disperse the water in the first accommodating chamber 31 and spray it out from the spray hole 32; the lower part of the upper impeller 1 is rotatably arranged in the second accommodating chamber 41, and is used to draw water into the second accommodating chamber 41 through the first water inlet 411 and transport it to the first accommodating chamber 31. The lower impeller 2 is rotatably arranged in the third accommodating chamber 42, and is used to draw water into the third accommodating chamber 42 through the second water inlet 421 and output it through the water outlet 422.

[0059] The above-mentioned lower impeller 2 includes a shaft 21 located in the center, an end cover 22 extending gradually radially outward from the upper part of the shaft 21, and a blade 23 arranged on the lower wall surface of the end cover 22. In the assembled state, the end cover 22 is arranged close to the inner top wall of the third accommodating cavity 42, and the lower edge of the blade 23 is arranged close to the second water inlet 421.

[0060] In this embodiment, if Figure 9As shown in the figure, the cleaning machine applied with the above double-pump system includes a box body 6 and a water supply pipe 7 that can convey the water at the bottom of the box body 6 upward. 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 driving member 5 is a motor, which is arranged at the outer bottom of the box body 6, and the output shaft 51 is arranged upward. The output shaft 51 passes through the lower shell 4 of the box body 6 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 for driving the upper impeller 1 and the lower impeller 2 to rotate.

[0061] The water supply pipe 7 has relatively independent first branch pipes 71 and second branch pipes 72. The first branch pipe 71 is used to convey the water flow to the middle of the box body, and the second branch pipe 72 is used to convey the water flow to the top of the box body. With such a structure, spraying on the lower layer, middle layer, and top layer is realized, which is beneficial to improving the cleaning effect.

[0062] A water distribution valve 8 for controlling the flow of the first branch pipe 71 and the second branch pipe 72 is further arranged at the bottom of the box body 6. The water inlet of the water distribution valve 8 is connected to the water outlet 422 of the lower shell 4. The first water outlet of the water distribution valve 8 is connected to the input end of the first branch pipe 71, and the second water outlet of the water distribution valve 8 is connected to the input end of the second branch pipe 72. This structure facilitates controlling the use states of spraying on the middle layer and the top layer according to needs. For example, the first branch pipe 71 can be closed and the second branch pipe 72 can be opened for only top-layer spraying; or the first branch pipe 71 can be opened and the second branch pipe 72 can be closed for only middle-layer spraying to meet more usage requirements.

[0063] A slag basket 9 is arranged at the bottom of the box body 6, and the first water inlet 411 and the open mouth 4200 are both arranged close to the slag basket 9. This structure is beneficial to improving the slag collection effect.

[0064] During use, the output shaft 51 of the driving member 5 rotates, driving the upper impeller 1 and the lower impeller 2 to rotate. The axial-flow blades at the lower part of the upper impeller 1 suck the water from the first water inlet 411 into the second accommodating cavity 41 and convey it upward to the first accommodating cavity 31. The water in the first accommodating cavity 31 is ejected through the spray holes 32 under the action of the upper part of the upper impeller 1; the lower impeller 2 sucks the water from the second water inlet 421 into the third accommodating cavity 42 and conveys it to the water supply pipe 7 along the circumferential direction through the guiding pipe 423 via the water outlet 422, and the water supply pipe 7 conveys the water flow upward for top and / or middle spraying.

[0065] In the description and claims of the present invention, directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various exemplary structural parts and elements of the present invention. However, these terms are used herein only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these directional terms are used only for illustration and should not be construed as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0066] As used herein, "fluid communication" refers to the spatial positional relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, a fluid (gas, liquid or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid passage such as a pipe, a channel, a conduit, a flow guide, a hole, a groove, etc., or a chamber allowing fluid to flow through, or a combination thereof.

Claims

1. A dual-pump system for a cleaning machine, including a volute structure of a water pump, characterized in that: The volute structure of the water pump includes an upper housing (3) having a first accommodating cavity (31) for mounting the upper part of the first power component, and spray holes (32) communicating with the first accommodating cavity (31) are formed on the top wall and / or side wall of the upper housing (3); and a lower housing (4) connected below the upper housing (3). The upper part of the lower housing (4) has a second accommodating cavity (41) for mounting the lower part of the first power component. The second accommodating cavity (41) communicates with the first accommodating cavity (31). A first water inlet (411) for water to enter the second accommodating cavity (41) is formed on the side of the lower housing (4). The lower part of the lower housing (4) has a third accommodating cavity (42) for mounting the second power component. A second water inlet (421) for water to enter the third accommodating cavity (42) is formed on the bottom wall of the lower housing (4). A guide ring (420) arranged around the second water inlet (421) and having a side opening (4200) is further provided on the bottom wall of the lower housing (4). The opening (4200) of the guide ring (420) is located beside the first water inlet (411). A water outlet (422) for water to be output from the third accommodating cavity (42) is formed on the side of the lower housing (4); The double-pump system further includes: an upper impeller (1), the upper part of the upper impeller (1) is rotatably arranged in the first accommodating cavity (31) for dispersing the water in the first accommodating cavity (31) and spraying it out from the spray holes (32); the lower part of the upper impeller (1) is rotatably arranged in the second accommodating cavity (41) for sucking the water into the second accommodating cavity (41) through the first water inlet (411) and conveying it to the first accommodating cavity (31); and a lower impeller (2) rotatably arranged in the third accommodating cavity (42) for sucking the water into the third accommodating cavity (42) through the second water inlet (421) and outputting it through the water outlet (422); a guide channel (413) extending obliquely downward is provided on the side of the lower housing (4). A partition plate (43) for separating the second accommodating cavity (41) and the third accommodating cavity (42) into relatively independent cavities is provided in the middle of the lower housing (4). The lower edge of the lower end of the guide channel (413) is substantially aligned with the guide ring (420). An arc-shaped guide plate (4130) extending obliquely downward is provided on the outer side wall of the lower housing (4) in the guide channel (413) so that the flow channel width at the first water inlet (411) gradually decreases from top to bottom. The cross-section of the guide channel (413) forms a smooth curved ⌒-shaped structure (4135) at the outer edge of the partition plate (43); The double-pump system is an open double-pump system disposed in the cleaning machine housing. The second accommodating cavity and the first accommodating cavity supply water for bottom spraying, and the third accommodating cavity supplies water for top and / or middle spraying; the upper impeller and the lower impeller rotate. The axial-flow blades below the upper impeller suck water from the first water inlet into the second accommodating cavity and convey it upward to the first accommodating cavity. The water in the first accommodating cavity is ejected through the spray holes under the action of the upper part of the upper impeller; the lower impeller sucks water from the second water inlet into the third accommodating cavity and conveys it to the water supply pipe in the circumferential direction through the water outlet. The water supply pipe conveys the water flow upward and provides top and / or middle spraying for the cleaning machine.

2. The double-pump system of the cleaning machine according to claim 1, wherein: The opening (4200) of the guide ring (420) is located at the bottom edge of the lower housing (4). The first end of the guide ring (420) forms a first guide arc section (4201) that arches inward toward the opening (4200) near the opening (4200). The second end of the guide ring (420) forms a second guide arc section (4202) that arches inward toward the opening (4200) near the opening (4200), and the arc radius corresponding to the second guide arc section (4202) is smaller than the arc radius corresponding to the first guide arc section (4201).

3. The dual-pump system of the cleaning machine according to claim 2, wherein: The lower port of the guide channel (413) constitutes the first water inlet (411), and the first water inlet (411) is arranged adjacent to the opening (4200).

4. The dual-pump system of the cleaning machine according to claim 3, wherein: The guide channel (413) is located above the partition plate (43) and extends downward along the periphery of the partition plate (43) from top to bottom.

5. The dual-pump system of the cleaning machine according to claim 4, wherein: An upward-arching arc-shaped notch (4136) is formed at the outer edge of the lower port of the guide channel (413), and the arc-shaped notch (4136) constitutes the water inlet of the guide channel (413).

6. The dual-pump system of the cleaning machine according to claim 4, characterized in that: The third accommodating cavity (42) is generally disk-shaped. The second accommodating cavity (41) is located above the partition plate and extends vertically. The diameter of the lower port of the second accommodating cavity (41) is smaller than the diameter of the third accommodating cavity (42). A circular area (400) corresponding to the lower port of the second accommodating cavity (41) is provided on the upper wall surface of the partition plate (43). The guide channel (413) has a first side wall (4133) and a second side wall (4134) that are tangentially connected to the outer edge of the circular area (400). The first side wall (4133) and the second side wall (4134) are arranged opposite to each other and the distance between the two gradually decreases along the water flow direction.

7. The dual-pump system of the cleaning machine according to any one of claims 1 to 6, characterized in that: The water outlet (422) is opened on the side wall of the lower housing (4) and is tangentially connected to the third accommodating cavity (42) through a guide pipe (423).

8. The double-pump system of the cleaning machine according to any one of claims 3 to 6, characterized in that: The second accommodating cavity (41) is divided into a first section (41a), a second section (41b), and a third section (41c) from bottom to top along the water flow direction. The lower end of the first section (41a) corresponds to the arrangement of the guide channel (413). The second section (41b) is smoothly connected to the first section (41a) and the inner diameter gradually decreases. The third section (41c) is smoothly connected to the second section (41b) and the inner diameter gradually increases.

9. The dual-pump system of the cleaning machine according to claim 8, characterized in that: A third water inlet (34) is provided on the bottom wall of the upper shell (3) and is arranged corresponding to the first accommodating chamber (31). The third water inlet (34) is connected to the upper end of the third section (41c) of the second accommodating chamber (41). The third section (41c) constitutes a guide portion for smoothly transitioning the inner wall of the second accommodating chamber (41) to the inner bottom wall of the first accommodating chamber (31). The outer edge of the guide portion (412) is arranged close to the inner edge of the third water inlet (34).

10. The double-pump system of the cleaning machine according to any one of claims 1 to 6, characterized in that: A support ring (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 ring (44).

11. The double-pump system of the cleaning machine according to claim 10, characterized in that: A clamping ring (441) is arranged on the upper wall surface of the support ring (44), and a clamping foot (33) is arranged on the bottom wall of the upper shell (3) and can be rotatably passed through the clamping ring (441) and is clamped and limited with the bottom wall of the clamping ring (441).

12. The double-pump system of the cleaning machine according to any one of claims 1 to 6, characterized in that: The lower impeller (2) comprises a shaft (21) located at the center, an end cover (22) extending gradually outward in a radial direction from the upper portion of the shaft (21), and blades (23) arranged on the lower wall surface of the end cover (22); in an assembled state, the end cover (22) is arranged close to the inner top wall of the third accommodating chamber (42), and the lower edge of the blade (23) is arranged close to the second water inlet (421).

13. A cleaning machine applying the double-pump system described in any one of claims 1 to 12, comprising a box body (6) and a water supply pipe (7) capable of conveying the water at the bottom of the box body (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).

14. The cleaning machine according to claim 13, wherein: 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).

15. The washing machine according to claim 14, 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 of the water diverter valve is connected to the input end of the first branch pipe (71); and the second water outlet of the water diverter valve is connected to the input end of the second branch pipe (72).

16. The cleaning machine according to claim 13, wherein: A slag basket (9) is provided at the bottom of the box body (6), and the first water inlet (411) and the open opening (4200) are both arranged close to the slag basket (9).

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