A cleaning machine and a cleaning method

Abstract

The present application relates to a kind of cleaning machine and cleaning method, first cavity and backwater area are integrally formed in the present application, provide the slow-flow area in backwater process, it is favorable to improve backwater flow rate stability, the heating element that covers the bottom of first cavity constitutes the part of box bottom wall, not only simplify the structure of box bottom, and make box bottom flat, to eliminate the problem of residue accumulation, simultaneously, heating element real-time heating to the backwater that enters and flows through first cavity, heating efficiency is high;After cleaning, heating element will the little residual water at the bottom of backwater area heat treatment, residual water becomes steam from bottom spray arm from bottom to top injection, from pipeline and top spray arm from top to bottom injection, not only eliminate the residual water in bottom spray arm, backwater area bottom, pipeline, top spray arm, truly realize the whole cavity no residual water, and make airflow in washing chamber occur up-down collision, it is favorable to improve drying effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dishwashers, in particular to a cleaning machine and a cleaning method for cleaning tableware and fruits and vegetables. BACKGROUND

[0002] For a dishwasher with a large volume, in order to achieve a better washing effect, at least two groups of spray arms arranged in an up-down manner are generally provided. During operation, a washing pump delivers water to each spray arm for up-down spraying, and the water falling back after washing the tableware is collected in a water cup at the bottom of the dishwasher. The washing pump delivers the falling back water to each spray arm again to complete a water flow cycle.

[0003] The applicant's prior application CN202211216094.7 "Water flow system for cleaning machine and cleaning machine" discloses a structure in which a guide vane capable of splitting water is arranged in the pump shell of the water pump. One way of water is output through the first water outlet at the top of the pump shell, and the other way of water is output through the second water outlet at the side of the pump shell. The guide vane itself does not move. Under the splitting action of the guide vane, the interference problem of the two ways of water is eliminated, the water flow energy loss is reduced, and both ways of water can maintain a high head and a large water flow. The operation of the entire water flow system can be completed by relying on only one centrifugal impeller, the overall structure is simple, and the production cost is reduced. However, since the pump shell is fixed to the bottom of the box body by screws, there is a height difference at each connection structure, which causes some residual water to remain in the bottom of the box body after cleaning, which can easily breed bacteria and cause secondary pollution if stored for a long time.

[0004] Therefore, the structure of the above cleaning machine needs to be further improved. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a cleaning machine that can easily drain residual water and perform local drying treatment, thereby realizing no residual water in the bottom of the box body and avoiding bacterial breeding.

[0006] The second technical problem to be solved by the present application is to provide a cleaning method for the above cleaning machine.

[0007] The technical solutions adopted by the present application to solve at least one of the above technical problems are as follows:

[0008] The application discloses a cleaning machine, which comprises a box body and a water pumping mechanism, wherein the bottom of the box body is provided with a concave water returning area, the top of the water returning area is covered with a filter plate, the water pumping mechanism is used for pumping water in the water returning area to the filter plate, the bottom of the water returning area is shaped with a first cavity which is upwardly arched and has an open bottom, a second cavity for installing a water pumping assembly of the water pumping mechanism is shaped above the first cavity, the bottom edge of the first cavity is communicated with the water returning area through a water returning port, and the second cavity is communicated with the first cavity and the filter plate respectively; and a heating element is arranged at the open bottom of the first cavity.

[0009] Preferably, the water pumping mechanism comprises a driving element and the water pumping assembly, the second cavity constitutes a pump shell for installing the water pumping assembly, the driving element is arranged below the heating element and the power output shaft of the driving element penetrates the heating element, extends into the inner cavity of the pump shell and is connected with the water pumping assembly. The second cavity of the application is integrally formed with the water returning area of the bottom of the box body, has good sealing performance and stability, the water pumping assembly is arranged in the second cavity, an open water pump directly communicated with the washing cavity is formed, the water returning path is short, the water suction stability is good, the fluid energy loss is reduced, the jet lift and water pressure are improved, and the cleaning effect is improved.

[0010] Preferably, the heating element is a thick film heating plate which is covered at the open bottom of the first cavity through a sealing element, and the thick film heating plate constitutes the bottom wall of the first cavity. The thick film heating plate is arranged at the bottom of the first cavity, the thick film heating plate constitutes part of the bottom wall of the box body, the unevenness and residue accumulation problem caused by directly arranging the heating element at the bottom of the box body are eliminated, the bottom wall of the first cavity is completely covered by the thick film heating plate, the first cavity as the first direct transition cavity of the water returning is beneficial to improving the heating efficiency of the washing water, and after washing, the heated air can be diffused to all parts of the dishwasher at a uniform temperature and flow rate through the transition cavity, the drying effect is improved, and the effect that there is no residual water in all parts of the water returning area is achieved.

[0011] Preferably, the bottom of the water returning area is provided with a drainage port beside the heating element, the drainage port is provided with a residue collecting basket whose top is exposed to the filter plate, the water returning port is located between the heating element and the drainage port, and at least part of the bottom wall of the water returning port gradually decreases from the upper surface of the thick film heating plate to the drainage port. In the water returning process, most of the water returning enters the first cavity through the side of the residue collecting basket and the water returning port, the above structure is beneficial to reducing the fluid energy loss and avoiding the accumulation of residues at the bottom wall of the water returning area between the residue collecting basket and the first cavity, and the secondary pollution problem is eliminated.

[0012] Preferably, the pump shell bottom is provided with a water suction port communicated with the first cavity, the pump shell top is provided with a first water outlet, the pump shell side is provided with a second water outlet, the tank bottom is provided with a bottom spray arm above the filter plate and communicated with the first water outlet, and the tank middle upper part is provided with a top spray arm communicated with the second water outlet through a pipeline. The water column sprayed upward by the bottom spray arm can clean the dishes in the washing cavity, and the dishes in the upper part of the washing cavity, especially the back of the dishes, can be cleaned from top to bottom by the top spray arm, so that the cleaning dead angle is eliminated and the cleaning effect is improved.

[0013] Preferably, the water suction assembly comprises a guide vane and a centrifugal impeller, the guide vane is arranged in the pump shell and comprises a cover plate capable of separating the pump shell cavity into an upper cavity and a lower cavity, the first water outlet is communicated with the upper cavity, the second water outlet is communicated with the lower cavity, the cover plate is provided with a water distribution port below, and the cover plate edge is provided with a water guide port communicated with the water distribution port and used for water flowing from the lower cavity into the upper cavity; the centrifugal impeller is rotatably arranged in the lower cavity and used for sucking water into the lower cavity through the water suction port, and then sucking the water in the lower cavity into the upper cavity through the water guide port and then out through the first water outlet or directly out through the second water outlet. The guide vane capable of distributing water is arranged in the pump shell, one part of the distributed water is output through the first water outlet at the top of the pump shell, and the other part of the distributed water is output through the second water outlet at the side of the pump shell. The guide vane itself does not move, the interference problem of the two water outlets is eliminated, the water flow energy loss is reduced, the two water outlets can maintain a high lift and a large water flow, the operation of the water flow system of the present application can be completed by only one centrifugal impeller, the overall structure is simple, and the production cost is reduced. In addition, the open water flow system is maintained, and the water flow system is convenient to disassemble and clean.

[0014] Preferably, the lower surface of the cover plate is provided with a plurality of guide vanes, the plurality of guide vanes are arranged at intervals in the circumferential direction of the cover plate and extend inwardly from the cover plate edge against the water flow direction, and a water distribution flow channel is constrained between adjacent two guide vanes. The top part of the guide vane corresponds to the cover plate part which is at least partially missing to form the water guide port communicated with the water distribution flow channel outlet, and the water distribution flow channel outlet constitutes the water distribution port. The guide vane has the following effects: (1) cooperating with the cover plate to form a surrounding cavity to pressurize all water flow in the pump shell in the circumferential direction; (2) the water is distributed in the circumferential direction between adjacent two guide vanes, so that part of the water is output through the second water outlet, and the other part of the water continues to flow in the circumferential direction in the lower cavity with the centrifugal impeller, and most of the water is transported to the first water outlet through the water guide port.

[0015] Preferably, the cover plate is disc-shaped, the outer ends of the guide vanes are projected on the horizontal plane at the edge of the disc-shaped cover plate, and each of the guide vanes encloses a surrounding cavity in the circumferential direction of the cover plate for pressurizing and circumferentially distributing the water flow under the cover plate. This structure can press the fluid to be distributed and reduce the energy loss caused by the different flow directions of the two flows during the distribution process.

[0016] Preferably, in the assembled state, the edge of the cover plate is arranged close to the inner wall of the pump shell, and the outer end of the guide vane is arranged close to the inner wall of the pump shell.

[0017] Preferably, in the two guide vanes arranged adjacently, the outer end portion of the first guide vane is arranged staggered with the inner end arrangement portion of the second guide vane to enclose the water distribution channel, and the cover plate is missing in the range from the outer end of the first guide vane to the outer end of the second guide vane to form the water outlet. The number of water outlets on the cover plate can be set as required, and the number of water outlets is less than the number of water distribution channels to control the flow distribution of the first water outlet and the second water outlet.

[0018] Preferably, the upper surface of the cover plate is provided with a flow converging vane extending spirally from the edge to the middle for converging the water flow delivered through the water outlet to the upper part of the central part. This structure can straighten and converge the upwardly delivered water to reduce energy loss and improve water pressure.

[0019] Preferably, the central part of the upper surface of the cover plate is provided with a flow guide cone gradually extending upward from the outside to the inside, the flow converging vane is multiple and arranged at intervals in the circumferential direction of the cover plate, and the inner end of the flow converging vane is connected with the outer edge of the flow guide cone. This structure can further straighten and converge the upwardly delivered water to reduce energy loss and improve water pressure.

[0020] Preferably, the second water outlet is tangentially connected with the inner wall of the pump shell, and the centrifugal blades of the centrifugal impeller extend from the center to the edge along the water distribution direction of the pump shell to the second water outlet. This structure can reduce the energy loss at the second water outlet.

[0021] In order to facilitate connection, the inlet of the top spray arm is located at the top or side thereof, the spray holes of the top spray arm are arranged downward, the bottom of the pipeline is transversely arranged and the inlet end is connected with the second water outlet, the middle part of the pipeline extends vertically, and the upper part of the pipeline is transversely arranged and the outlet end is connected with the top spray arm.

[0022] Preferably, the box is a sink with a top opening, an upwardly opening door body is arranged at the opening of the top of the sink, the top spray arm is arranged at the inner surface of the door body, the inlet end of the top spray arm is located at the top thereof, and at least part of the upper part of the pipeline is located in the door body to be connected with the inlet end of the top spray arm.

[0023] Preferably, the parts constituting the first cavity and the second cavity are integrally formed in the backwater area, the top of the second cavity is provided with a top opening, a top cover is installed at the top opening, and the first water outlet is formed in the top cover. This structure is convenient to produce and manufacture, improves the convenience, stability and sealing of the assembly of each structure, avoids bubble suction, reduces fluid energy loss, etc.

[0024] A cleaning method, comprising the steps of:

[0025] (1) Water is fed into the box, and the water pumping mechanism is operated to pump the water in the backwater area to the bottom spray arm and the top spray arm, and the box is washed by the bottom spray arm spraying upward and the top spray arm spraying downward, respectively. After washing, the water pumping mechanism stops running, and the water is drained.

[0026] The above cleaning process is performed at least twice, and at least one cleaning process is performed with the heating element heating the washing water.

[0027] (2) After washing, the remaining water in the bottom spray arm flows to the drain under the action of gravity through the second cavity, the first cavity, the heating element, and the backwater outlet. The remaining water in the top spray arm falls through the spray holes, some adheres or remains in the flow channel, and the remaining water in the pipeline for supplying water to the top spray arm falls back into the second cavity under the action of gravity and further flows to the drain through the first cavity, the heating element, and the backwater outlet.

[0028] (3) The water pumping mechanism is operated, and the water pumping assembly generates circulating air with large wind pressure and small wind resistance. The circulating air sucks the air in the box into the second cavity through the backwater outlet, the heating element, and the first cavity, and then is sent to the bottom spray arm through the first water outlet to achieve upward blowing, and at the same time, the bottom spray arm is dried, and the dishes are dried. Through the second water outlet and the pipeline, it is sent to the top spray arm. In this process, the air preheated by the heating element warms up the pipeline, and the remaining water in the top spray arm is blown into the box through the spray holes, and is discharged through the drain.

[0029] Compared with the prior art, the application has the advantages that the first cavity and the backwater area are integrally formed in the application, a slow-flow area during backwater is provided, the stability of the backwater flow rate is improved, the heating element covering the bottom of the first cavity constitutes part of the bottom wall of the box, the structure of the bottom of the box is simplified, the bottom of the box is flat, the problem of residue accumulation is eliminated, the heating element heats the backwater entering and flowing through the first cavity in real time, the heating efficiency is high, after cleaning, the heating element heats the little residual water at the bottom of the backwater area, the residual water becomes steam, the steam is sprayed from bottom to top through the bottom spray arm, from top to bottom through the pipeline and the top spray arm, the residual water in the bottom spray arm, the bottom of the backwater area, the pipeline and the top spray arm is eliminated, the whole cavity is truly residual water-free, and airflow collides up and down in the washing cavity, which is beneficial to improve the drying effect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of an embodiment of the application;

[0031] Figure 2 is a sectional view of Figure 1 ;

[0032] Figure 3 is another sectional view of Figure 1 ;

[0033] Figure 4 is an enlarged view of part A in Figure 3 ;

[0034] Figure 5 is a structural schematic view of the outer bottom of the box in an embodiment of the application;

[0035] Figure 6 is a structural schematic view of the inner bottom of the box in an embodiment of the application;

[0036] Figure 7 is a structural schematic view of the guide vane in an embodiment of the application;

[0037] Figure 8 is a structural schematic view of the bottom of the guide vane in an embodiment of the application. DETAILED DESCRIPTION

[0038] The application will be further described in detail below with reference to the embodiments of the drawings.

[0039] As Figures 1-8As shown, the cleaning machine of the embodiment comprises a box body 4 and a water pumping mechanism 5, the bottom of the box body 4 is provided with a concave backwater area 41, the top of the backwater area 41 is covered with a filter plate 42, the water pumping mechanism 5 is used to pump the water in the backwater area 41 to the filter plate 42, the bottom of the backwater area 41 is shaped with a first cavity 401 which is upwardly arched and has a bottom opening 411, the first cavity 401 is shaped with a second cavity 402 above the first cavity 401 for mounting a water pumping assembly 51 of the water pumping mechanism 5, the bottom edge of the first cavity 401 is connected with the backwater area 41 through a backwater port 412, the second cavity 402 is connected with the first cavity 401 and the filter plate 42 above the filter plate 42 respectively; the bottom opening 411 of the first cavity 401 is provided with a heating element 6.

[0040] The water pumping mechanism 5 comprises a driving member 51 and a water pumping assembly 52, the second cavity 402 constitutes a pump shell 1 for mounting the water pumping assembly 52, the driving member 51 is an electric motor, which is arranged below the heating element 6 and the power output shaft 511 of the electric motor penetrates through the heating element 6 and extends into the inner cavity of the pump shell 1 to be connected with the water pumping assembly 52. The second cavity 402 of the embodiment is integrally formed with the backwater area 41 of the bottom of the box body 4, which has good sealing performance and stability, the water pumping assembly 52 is arranged in the second cavity 402, which constitutes an open water pump directly connected with the washing cavity, the backwater path is short, the water suction stability is good, which is beneficial to reduce the fluid energy loss, improve the jet lift and water pressure, and further improve the cleaning effect.

[0041] The heating element 6 is a thick film heating plate, which is covered at the bottom opening 411 of the first cavity 401 through a sealing member 7, and the thick film heating plate constitutes the bottom wall of the first cavity 401. The thick film heating plate is covered at the bottom of the first cavity 401, which not only makes the thick film heating plate constitute part of the bottom wall of the box body 4, eliminates the unevenness and residue accumulation problem caused by directly mounting the heating element at the bottom of the box body 4, but also the thick film heating plate completely covers the bottom wall of the first cavity 401, the first cavity 401 as the first direct transition cavity of backwater is beneficial to improve the heating efficiency of the washing water, at the same time, after washing, the heated air can be diffused to all parts of the dishwasher at a uniform temperature and flow rate through the transition cavity, improve the drying effect, and realize the effect of completely no residual water in all parts of the backwater area 41.

[0042] The bottom of the backwater area 41 is provided with a water outlet 43 beside the heating element 6, and the water outlet 43 is provided with a slag collecting basket 8 with the top exposed from the filter plate 42. A backwater outlet 412 is located between the heating element 6 and the water outlet 43, and at least a part of the bottom wall of the backwater outlet 412 gradually decreases from the upper surface of the thick film heating plate to the water outlet 43. During the backwater process, most of the backwater enters the first cavity 401 through the side of the slag collecting basket 8 and the backwater outlet. The above structure is beneficial to reduce the fluid energy loss and avoid the accumulation of residues at the bottom wall of the backwater area 41 between the slag collecting basket 8 and the first cavity 401, thereby eliminating the problem of secondary pollution.

[0043] The bottom of the pump housing 1 is provided with a water suction port 13 connected with the first cavity 401, the top of the pump housing 1 is provided with a first water outlet 11, the side of the pump housing 1 is provided with a second water outlet 12, and the bottom of the box body 4 is provided with a bottom spray arm a located above the filter plate 42 and connected with the first water outlet 12. The top of the box body 4 is provided with a top spray arm b connected with the second water outlet 12 through a pipeline 9. In this embodiment, the bottom spray arm a sprays water column upward to mainly clean the tableware in the washing cavity, and the top spray arm b sprays water column downward to clean the tableware located at the upper part of the washing cavity, especially the back of the tableware, so as to eliminate the cleaning dead angle and improve the cleaning effect.

[0044] The water pumping assembly 52 includes the guide vane 2 and the centrifugal impeller 3. The guide vane 2 is arranged in the pump housing 1 and includes a cover plate 21 capable of separating the inner cavity of the pump housing 1 into an upper cavity 101 and a lower cavity 102. The first water outlet 11 is connected with the upper cavity 101, and the second water outlet 12 is connected with the lower cavity 102. The cover plate 21 is provided below the water distribution port 201, and the edge of the cover plate 21 is provided with a water guide port 23 connected with the water distribution port 201, for water to flow from the lower cavity 102 into the upper cavity 101. The centrifugal impeller 3 is rotatably arranged in the lower cavity 102, for pumping water into the lower cavity 102 through the water suction port 13, pumping the water in the lower cavity 102 into the upper cavity 101 through the water guide port 23, and then pumping the water out through the first water outlet 11 or directly pumping the water out through the second water outlet 12. In this embodiment, the guide vane 2 capable of distributing water is arranged in the pump housing 1. One way of the distributed water is output through the first water outlet 11 at the top of the pump housing 1, and the other way of the distributed water is output through the second water outlet 12 at the side of the pump housing 1. The guide vane 2 itself does not move. Under the distribution of the guide vane 2, the interference problem of the two ways of water output is eliminated, the water flow energy loss is reduced, the two ways of water output can maintain a high lift and a large water flow, the operation of the water flow system of this embodiment can be completed by only one centrifugal impeller 3, the overall structure is simple, and the production cost is reduced. In addition, this embodiment still maintains the open water flow system, which is convenient for disassembly and cleaning of the water flow system.

[0045] The lower surface of the cover plate 21 is provided with a plurality of guide vanes 22, which are arranged in a circumferential direction of the cover plate 21 and extend spirally inward from the edge of the cover plate 21 against the water flow direction. Adjacent two guide vanes 22 define a water distribution channel 24 therebetween. The top portion of the guide vane 22 is at least partially absent to form a water guide opening 23 which is connected to the outlet of the water distribution channel 24. The outlet of the water distribution channel 24 constitutes the water distribution opening 201. The guide vanes 22 have the following functions: (1) cooperating with the cover plate 21 to form a surrounding cavity to pressurize the water flow in the circumferential direction of the pump housing 1; (2) being arranged between adjacent two guide vanes 22 to distribute the water flow in the circumferential direction, so that part of the water flow is output through the second water outlet 12, and the other part of the water flow continues to flow in the lower cavity along the circumferential direction of the centrifugal impeller 3, and most of the water flow is transported to the first water outlet 11 through the water guide opening 23.

[0046] The cover plate 21 is disc-shaped, and the outer end of the guide vane 22 is projected on the horizontal plane at the edge of the disc-shaped cover plate 21. Each guide vane 22 surrounds a surrounding cavity 100 in the circumferential direction of the cover plate 21 to pressurize and distribute the water flow below the cover plate 21. This structure can press the fluid to be distributed, and reduce the energy loss caused by the different flow directions of the two flows during the distribution process.

[0047] In the assembled state, the edge of the cover plate 21 is arranged close to the inner circumferential wall of the pump housing 1, and the outer end of the guide vane 22 is arranged close to the inner wall of the pump housing 1.

[0048] In the two adjacent guide vanes 22, the outer end portion of the first guide vane 22 is arranged staggered with the inner end arrangement portion of the second guide vane 22 to surround the water distribution channel 24. The cover plate 21 is absent in the range corresponding to the outer end of the first guide vane 22 to the outer end of the second guide vane 22 to form the water guide opening 23. The number of the water guide openings 23 on the cover plate 21 can be set as required. The number of the water guide openings 23 is less than the number of the water distribution channels 24 to control the flow distribution of the first water outlet 11 and the second water outlet 12.

[0049] The upper surface of the cover plate 21 is provided with a plurality of flow converging vanes 25 which extend spirally from the edge to the middle to converge the water flow transported through the water guide opening 23 to the upper position of the central part. This structure can straighten and converge the upwardly transported water flow to reduce the energy loss and improve the water pressure. The central part of the upper surface of the cover plate 21 is provided with a flow guide cone 26 which extends gradually upward from the outside to the inside. The flow converging vanes 25 are arranged in a circumferential direction of the cover plate 21 and are spaced apart. The inner end of the flow converging vane 25 is connected to the outer edge of the flow guide cone 26. This structure can further straighten and converge the upwardly transported water flow to reduce the energy loss and improve the water pressure.

[0050] The second water outlet 12 of the embodiment is tangentially connected with the inner wall of the pump shell 1, and the centrifugal blades of the centrifugal impeller 3 extend from the center to the edge along the water distribution direction of the pump shell 1 to the second water outlet 12. The structure can reduce the energy loss at the second water outlet 12.

[0051] In order to facilitate connection, the inlet of the top spray arm b is located at the top or side of the top spray arm b, the spray holes of the top spray arm b are arranged downward, the bottom of the pipeline 9 is transversely arranged and the inlet end is connected with the second water outlet 12, the middle part of the pipeline 9 extends vertically, and the upper part of the pipeline 9 is transversely arranged and the outlet end is connected with the top spray arm b.

[0052] The tank 4 of the embodiment is a sink with a top opening, and the top opening of the sink is provided with an upward-opening door body 10, the top spray arm b is arranged at the inner surface of the door body 10, and the inlet end of the top spray arm b is located at the top of the top spray arm b. At least part of the upper part of the pipeline 9 is located in the door body 10 to be connected with the inlet end of the top spray arm b.

[0053] In the embodiment, the parts constituting the first cavity 401 and the second cavity 402 are integrally formed in the backwater area 41, the top of the second cavity 402 is provided with a top opening, the top opening is provided with a top cover 44, and the first water outlet 11 is arranged on the top cover 44. The structure is convenient for production and manufacturing, improves the convenience, stability and sealing of the assembly of each structure, avoids bubble suction, reduces fluid energy loss, etc.

[0054] The cleaning method of the embodiment is as follows:

[0055] (1) Water is fed into the tank 4, the water pumping mechanism 5 is operated to pump the water in the backwater area 41 to the bottom spray arm a and the top spray arm b, and the bottom spray arm a and the top spray arm b are used to spray upward and downward respectively to flush the objects to be cleaned in the tank 4, and after cleaning, the water pumping mechanism 5 is stopped and the water is drained.

[0056] The above cleaning process is performed at least twice, and in at least one cleaning process, the heating element 6 heats the washing water.

[0057] (2) After cleaning, the residual water in the bottom spray arm a flows to the drain port 43 through the second cavity 401, the first cavity 401, the heating element 6 and the backwater port 412 under the action of gravity, part of the residual water in the top spray arm b falls through the spray holes, and part of the residual water adheres or stays in the flow channel 9, the residual water in the pipeline 9 for supplying water to the top spray arm b falls into the second cavity 402 under the action of gravity, and further flows to the drain port 43 through the first cavity 401, the heating element 6 and the backwater port 412.

[0058] (3) running the pump water mechanism 5, the water pumping assembly 52 generates circulating air with large wind pressure and small wind resistance, the circulating air sucks the air in the box 4 into the second cavity 402 through the backwater port 412, the heating element 6, the first cavity 401, and then is transported to the bottom spray arm a through the first water outlet 11 to realize the top-down blowing, and the tableware is dried at the same time, and then is transported to the top spray arm b through the second water outlet 12 and the pipeline 9, in the process, the air or steam heated or preheated by the heating element 6 dries the pipeline 9, and the residual water in the top spray arm b is blown into the box 4 through the spray hole, and is discharged through the drain port 43, and the moisture in the drying washing cavity is discharged from the exhaust port 45 of the side wall of the box 4.

[0059] In the embodiment, the first cavity 401 and the backwater area 41 are integrally formed, which provides a slow-flow area in the backwater process, and is beneficial to improve the stability of the backwater flow rate, the heating element 6 covering the bottom of the first cavity 401 constitutes part of the bottom wall of the box 4, which not only simplifies the structure of the bottom of the box 4, but also makes the bottom of the box 4 flat to eliminate the problem of residue accumulation, and at the same time, the heating element 6 heats the backwater flowing through the first cavity 401 in real time, and the heating efficiency is high; after cleaning, the heating element 6 heats the little residual water at the bottom of the backwater area 41, and the residual water becomes steam and is sprayed from bottom to top through the bottom spray arm a, and from top to bottom through the pipeline 9 and the top spray arm b, which not only eliminates the residual water in the bottom spray arm a, the bottom of the backwater area 41, the pipeline 9 and the top spray arm b, and truly realizes the whole-cavity no residual water, but also makes the airflow collide up and down in the washing cavity, which is beneficial to improve the drying effect.

[0060] In the specification and claims of the present application, terms indicating directions, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom", etc. are used to describe various example structural parts and elements of the present application, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limitation, for example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

Claims

1. A cleaning machine comprising a tank (4) and a water pumping mechanism (5), the tank (4) being provided at its bottom with a recessed water return area (41), the top of which is covered with a filter plate (42), the water pumping mechanism (5) being arranged to pump water from the water return area (41) onto the filter plate (42), characterized in that: The bottom of the backwater area (41) is shaped as a first cavity (401) with an upward arch and an open bottom (411), and a second cavity (402) for installing the water pumping assembly (52) of the water pumping mechanism (5) is shaped above the first cavity (401), the bottom edge of the first cavity (401) is connected with the backwater area (41) through a backwater port (412), and the second cavity (402) is connected with the first cavity (401) and above the filter plate (42) respectively; the open bottom (411) of the first cavity (401) is provided with a heating element (6). The second cavity (402) constitutes a pump shell (1) for installing the water pumping assembly (52), the bottom of the pump shell (1) is provided with a water suction port (13) connected with the first cavity (401), the top of the pump shell is provided with a first water outlet (11), and the side of the pump shell (1) is provided with a second water outlet (12); the water pumping assembly (52) comprises a guide vane (2) and a centrifugal impeller (3), the guide vane (2) is arranged in the pump shell (1) and comprises a cover plate (21) capable of separating the inner cavity of the pump shell (1) into an upper cavity (101) and a lower cavity (102), the first water outlet (11) is connected with the upper cavity (101), the second water outlet (12) is connected with the lower cavity (102), the cover plate (21) is provided below the water distribution port (201), and the edge of the cover plate (21) is provided with a water guide port (23) connected with the water distribution port (201) and used for water flow from the lower cavity (102) into the upper cavity (101); the centrifugal impeller (3) is rotatably arranged in the lower cavity (102) and used for sucking water into the lower cavity (102) through the water suction port (13), pumping water in the lower cavity (102) into the upper cavity (101) through the water guide port (23) and then pumping out the water through the first water outlet (11) or directly pumping out the water in the lower cavity (102) through the second water outlet (12).

2. The cleaning machine of claim 1, wherein: The water pumping mechanism (5) comprises a driving element (51) and the water pumping assembly (52), the driving element (51) is arranged below the heating element (6) and the power output shaft thereof extends through the heating element (6) and into the inner cavity of the pump shell (1) to be connected with the water pumping assembly (52).

3. The cleaning machine of claim 2, wherein: The heating element (6) is a thick-film heating plate, which is covered at the open bottom (411) of the first cavity (401) by a sealing element, and constitutes the bottom wall of the first cavity (401).

4. The cleaning machine of claim 3, wherein: The bottom of the backwater area (41) is provided with a drainage port (43) beside the heating element (6), the drainage port (43) is provided with a residue collecting basket (8) with the top exposed above the filter plate (42), the backwater port (412) is located between the heating element (6) and the drainage port (43), and at least part of the bottom wall of the backwater port (412) gradually decreases from the upper surface of the thick-film heating plate to the drainage port (43).

5. The cleaning machine of claim 2, wherein: The bottom of the box (4) is provided with a bottom spray arm (a) above the filter plate (42) and connected with the first water outlet (11), and the upper part of the box (4) is provided with a top spray arm (b) connected with the second water outlet (12) through the pipeline (9).

6. The cleaning machine of claim 1, wherein: The lower surface of the cover plate (21) is provided with a plurality of guide vanes (22), which are arranged in a circumferential direction of the cover plate (21) and extend inward from the edge of the cover plate (21) against the water flow direction, and between two adjacent guide vanes (22), a water distribution channel (24) is formed, and the top of the guide vane (22) is connected with the outlet of the water distribution channel (24) to form the water guide opening (23).

7. The cleaning machine of claim 6, wherein: The cover plate (21) is disc-shaped, and the projection of the outer end of the guide vane (22) on the horizontal plane is located at the edge of the disc-shaped cover plate (21), and each guide vane (22) surrounds a surrounding cavity (100) for pressurizing and circumferentially distributing the water flow below the cover plate (21).

8. The cleaning machine of claim 7, wherein: In the assembled state, the edge of the cover plate (21) is arranged close to the inner wall of the pump shell (1), and the outer end of the guide vane (22) is arranged close to the inner wall of the pump shell (1).

9. The cleaning machine of claim 6, wherein: In the two guide vanes (22) arranged adjacent to each other, the outer end portion of the first guide vane (22) is arranged staggered with the inner end arrangement portion of the second guide vane (22) to enclose the water distribution channel (24), and the cover plate (21) is missing in the range corresponding to the outer end of the first guide vane (22) to the outer end of the second guide vane (22) to form the water guide opening (23).

10. The cleaning machine of claim 6, wherein: The upper surface of the cover plate (21) is provided with a flow converging vane (25) extending spirally from the edge to the middle, for converging the water flow delivered through the water guide opening (23) to the upper part of the central part.

11. The cleaning machine of claim 10, wherein: The central part of the upper surface of the cover plate (21) is provided with a guide cone (26) gradually extending upward from the outside to the inside, and the flow converging vane (25) is a plurality of and arranged in a circumferential direction of the cover plate (21), and the inner end of the flow converging vane (25) is connected with the outer edge of the guide cone (26).

12. The cleaning machine of claim 5, wherein: The second water outlet (12) is tangentially connected with the inner wall of the pump shell (1), and the centrifugal blades of the centrifugal impeller (3) extend from the center to the edge along the water distribution direction of the pump shell (1) to the second water outlet (12).

13. The cleaning machine of claim 5, wherein: The inlet of the top spray arm (b) is located at the top or side thereof, the spray holes of the top spray arm (b) are arranged downward, the bottom of the pipeline (9) is transversely arranged and the inlet end is connected with the second water outlet (12), the middle part of the pipeline (9) extends vertically, and the upper part of the pipeline (9) is transversely arranged and the outlet end is connected with the top spray arm (b).

14. The cleaning machine of claim 13, wherein: The box (4) is a sink with a top opening, and an upper door is arranged at the top opening of the sink. The top spray arm (b) is arranged on the inner surface of the door, and the inlet end of the top spray arm (b) is located at the top of the top spray arm (b). The upper part of the pipeline (9) is at least partially located in the door and connected with the inlet end of the top spray arm (b).

15. The cleaning machine according to any one of claims 1 to 14, characterized in that: The first cavity (401) and the second cavity (402) are integrally formed in the backwater area (41), and the top of the second cavity (402) is provided with a top opening, and a top cover (44) is arranged at the top opening. The first water outlet (11) is arranged on the top cover (44).

16. A cleaning method, characterized in that: (1) water is supplied into the box (4), the water pumping mechanism (5) is operated to pump water in the backwater area (41) to the bottom spray arm (a) and the top spray arm (b), and the bottom spray arm (a) and the top spray arm (b) are used to spray water upward and downward respectively to clean the objects to be cleaned in the box (4). After cleaning, the water pumping mechanism (5) stops operating, and water is drained. The above cleaning process is performed at least twice, and at least one cleaning process is performed with the heating element (6) heating the washing water; (2) after cleaning, the residual water in the bottom spray arm (a) flows to the drain (43) through the second cavity (402), the first cavity (401), the heating element (6), and the backwater outlet (412) under the action of gravity. The residual water in the top spray arm (b) falls through the spray holes, and part of the residual water adheres or remains in the flow channel. The residual water in the pipeline (9) for supplying water to the top spray arm (b) falls under the action of gravity and enters the second cavity (402), and further flows to the drain (43) through the first cavity (401), the heating element (6), and the backwater outlet (412); (3) the water pumping mechanism (5) is operated, and the water pumping assembly generates circulating air with large wind pressure and small wind resistance. The circulating air sucks air in the box (4) into the second cavity (402) through the backwater outlet (412), the heating element (6), and the first cavity (401), and then is sent to the bottom spray arm (a) through the first water outlet (11) to realize upward blowing. The air or steam heated or preheated by the heating element (6) dries the pipeline (9) and blows the residual water in the top spray arm (b) to the box (4) through the spray holes, and then is drained through the drain (43).

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