A filter structure for a cleaning machine and a cleaning machine

Abstract

The application relates to a filtering structure for a cleaning machine and the cleaning machine, the filtering structure comprising a backwater cavity and a filtering plate, the filtering plate covering the top of the backwater cavity, a retractable lap joint being connected at the edge of the filtering plate, a first magnetic part being arranged at the outer edge of the lap joint, and a second magnetic part capable of being attracted to the first magnetic part being arranged at the top edge of the backwater cavity. The application provides a filtering structure capable of restraining the filtering plate on the top of the backwater cavity through self-suction, the filtering plate edge being provided with a retractable lap joint, when the filtering plate is placed on the top of the backwater cavity, the first magnetic part is attracted to the second magnetic part to limit the filtering plate, the lap joint can automatically stretch and retract to adapt to the size of the opening of the filtering plate and the top of the backwater cavity, the sealing between the filtering plate and the top edge of the backwater cavity can be kept all the time, residues are prevented from entering the backwater cavity to participate in backwater, and the filtering plate is prevented from being blocked, and the cleaning degree is improved.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, specifically to a filter structure for a cleaning machine and the cleaning machine itself. Background Technology

[0002] As people's living standards continue to improve, dishwashers, as a type of kitchen appliance, are increasingly entering households. Currently, dishwashers on the market are generally divided into three types: countertop, cabinet, and sink. Countertop dishwashers are freestanding units that are typically placed on the countertop; cabinet dishwashers are also freestanding units, but they need to be integrated into kitchen cabinets; and sink dishwashers are integrated with the sink and are typically installed in kitchen cabinets.

[0003] Currently, the structure of water tank cleaning machines on the market is mainly the structure mentioned in the applicant's earlier application CN201310750968.1 "Water Tank Cleaning Machine". This structure includes a housing forming the washing space, comprising a water tank body and a cover plate rotatably connected to the water tank body. The bottom of the water tank body has a recessed drainage area at least in the center. A water pump is installed in the drainage area to pump water from the drainage area to the washing space above the drainage area. The drainage area is covered by a drain plate with drainage holes, and a rotating spray arm with water outlet holes, fluidly connected to the water pump, is located above the drain plate. Furthermore, to further improve the cleaning effect, the applicant's earlier applications CN201810334714.4 and CN201810334713.X "Carrier Structure of Water Tank Cleaning Machine" add a heating plate at the bottom of the water tank body to heat the water in the drainage area, and a slag basket with corresponding drain outlets at the bottom of the drainage area to facilitate slag removal.

[0004] In existing dishwashers, the drain plate is typically connected to the top of the drain area using an interference fit, or the drain plate is simply placed on top of the drain area and then secured by a scrap basket attached to the drain outlet. This method is not only inconvenient to disassemble and reassemble, resulting in poor assembly reliability, but also often leaves a large gap at the connection between the edge of the drain plate and the drain area due to dimensional errors during production. This gap may allow some residue to enter the drain area and participate in the backflow, clogging the spray nozzles of the spray arm, causing secondary pollution and affecting the cleaning effect. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a filter structure for a cleaning machine that is easy to assemble and disassemble from the top of the return water chamber and has good sealing at the connection, thereby avoiding clogging of the spray arm and improving the cleaning effect, in light of the current state of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a cleaning machine with the above-mentioned filtration structure, in view of the current state of the prior art.

[0007] The technical solution adopted by the present invention to solve at least one of the above-mentioned technical problems is as follows:

[0008] A filter structure for a cleaning machine includes a return water chamber and a filter plate. The filter plate covers the top of the return water chamber. A retractable overlapping piece is connected to the edge of the filter plate. A first magnetic element is provided at the outer edge of the overlapping piece. Correspondingly, a second magnetic element that can attract the first magnetic element is provided at the top edge of the return water chamber.

[0009] Preferably, a first groove extending circumferentially is provided at the outer edge of the overlapping piece, and correspondingly, the inner ring of the first magnetic element is embedded in the first groove, while the outer ring protrudes outside the first groove. This structure helps to improve the connection stability and reliability between the first magnetic element and the overlapping piece.

[0010] Further preferably, the cross-sections of the first card slot and the inner ring of the first magnetic component are formed into a matching T-shaped structure.

[0011] Preferably, a second slot is formed at the top edge of the return water chamber, facing the edge of the filter plate, and the second magnetic component is embedded in the second slot. This structure helps to improve the assembly stability and reliability of the second magnetic component.

[0012] Preferably, the top of the return water chamber is provided with an overlapping platform with an L-shaped cross-section. The second slot is formed on the inner wall of the vertical portion of the L-shaped structure, and in the assembled state, the exposed sidewall of the second magnetic component is flush with the inner wall of the vertical portion of the L-shaped structure. This structure provides installation space for the filter plate and maintains the flatness of the mounting surfaces, thereby improving sealing and preventing gaps that could lead to residue leakage.

[0013] Preferably, in the assembled state, the outer peripheral wall of the outer ring of the first magnetic component matches the shape of the exposed side wall of the second magnetic component. The upper wall surface of the outer ring of the first magnetic component is flush with the upper wall surface of the edge of the overlapping piece, and the lower wall surface is flush with the lower wall surface of the edge of the overlapping piece. This structure helps to further improve the sealing performance between the edge of the filter plate and the top of the return water chamber after installation.

[0014] For ease of connection, the inner edge of the overlapping piece is fused and / or snapped onto the outer edge of the filter plate. When the overlapping piece is fused to the filter plate, its inner edge overlaps the filter plate above and / or below it. When the overlapping piece is snapped onto the filter plate, a notch is provided on the filter plate, and the inner edge of the overlapping piece overlaps the filter plate, covering the notch. The bottom of the overlapping piece has a protruding locking foot that engages with the notch. The filter plate is a metal plate, and the overlapping piece is a rubber sheet with an S-shaped cross-section. This structure facilitates connection and improves sealing.

[0015] A cleaning machine includes a housing and the aforementioned filter structure, wherein the return water chamber is located at the bottom of the housing.

[0016] The cleaning machine of the present invention also includes a slag collection basket, the lower part of which is housed in the return water chamber and the upper end of which protrudes from the filter plate. A guide area communicating with the return water chamber is recessed at the bottom of the housing. A baffle covering the top of this guide area is provided. A pumping mechanism is provided at the bottom of the housing to pump water from the return water chamber through the guide area to the baffle. The present invention separates the pumping mechanism from the return water chamber and the filter plate, i.e., the return water chamber and the filter plate are independently arranged beside the pumping mechanism. The pumping mechanism does not need to pass through the filter plate for installation, providing convenience for assembly. Simultaneously, the baffle does not participate in filtration, eliminating the disadvantages of poor filtration and residue accumulation at the drive mechanism. More water flows through the filter plate and collects slag through the slag collection basket more quickly, which is beneficial for improving filtration and slag collection effects. Since the pumping mechanism is not installed in the return water chamber, the limitation of installation space is eliminated, making it easier to reduce the water suction surface of the pumping mechanism to avoid air bubbles entering the return water, which is beneficial for improving pump performance.

[0017] In the above scheme, the pumping mechanism includes a spray arm, an impeller assembly, and a drive unit. The spray arm is mounted on a baffle. The upper part of the impeller assembly extends through the baffle into the spray arm, and the lower part is located in the semi-enclosed space formed by the baffle and the guide area. The drive unit is located at the bottom of the housing, and its power output shaft passes through the guide area and connects to the impeller assembly. Using this structure, an open, pipeless water pump is formed by utilizing the semi-enclosed space created by the baffle and the guide area, facilitating the removal of the baffle for cleaning the pump's interior.

[0018] Preferably, the connection between the spray arm and the baffle is adjacent to and spaced apart from the filter plate. Arranging the spray arm beside the filter plate without it passing through it facilitates assembly, and eliminates filtration at the pump mechanism. This avoids residue accumulation and allows water containing residue to be guided to the filter plate and sludge collection basket at maximum speed and along the shortest path, thus improving sludge collection efficiency.

[0019] Preferably, the semi-enclosed space and the inner cavity of the spray arm for accommodating the upper part of the impeller assembly together constitute the pump chamber of the pumping mechanism, and the connection between the flow guiding area and the return water chamber constitutes the water inlet of the pump chamber. This structure facilitates the formation of an open water pump structure without pipelines.

[0020] Preferably, the upper surface of the baffle plate is smoothly connected to the bottom wall of the tank, and the edge of the baffle plate extends outward and downward at the water inlet of the corresponding pump chamber to form a water guiding surface arranged near the side of the slag collection basket. The upper surface of the baffle plate is roughly flush with the bottom wall of the tank, so it will not obstruct the return water and can make the return water flow quickly to the filter plate, which is beneficial to improving the return water speed and avoiding the accumulation of residue near the spray arm.

[0021] Preferably, a rim is formed at the outer edge of the water guide surface, which partially surrounds the side of the slag collection basket and extends longitudinally. The height of the lower edge of this rim is lower than the height of the water absorption surface at the top of the slag collection basket. Near the filter plate, the slag collection basket has a guide plate that slopes downwards from the edge to the center. The height of the lower edge of this guide plate is the height of the water absorption surface of the slag collection basket. Since the lower edge of the rim is lower than this water absorption surface height, the water absorption surface height of the pump mechanism is effectively lowered below the water absorption surface of the slag collection and return water of the slag collection basket, which avoids the intake of air bubbles and improves pump performance.

[0022] Preferably, the bottom wall of the spray arm has a water inlet, and correspondingly, the baffle has a flow guide sleeve that runs vertically through the middle and connects with the water inlet, and the lower part of the impeller assembly is located in the flow guide sleeve.

[0023] Preferably, the pumping mechanism and the flow guiding area are located in the central part of the bottom of the tank, and the return water chamber is arranged near the edge of the bottom of the tank and located beside the flow guiding area. Since the top of the flow guiding area is covered by a baffle, the above structure ensures that the central part of the tank remains flat and there is no assembly structure that would obstruct residue and return water, which is beneficial to improving the return water effect and the residue collection effect.

[0024] Preferably, the bottom of the return water chamber is recessed near the guide area to form a slag collection area. A drain outlet is located at the bottom of this slag collection area, and the lower part of the slag collection basket is housed within this slag collection area with its lower end corresponding to the drain outlet. The sidewall of the slag collection area near the guide area forms a guide slope that gradually slopes upwards along the water flow. This structure ensures that the water inlet of the pump mechanism and the return water slag collection point maintain the shortest possible distance, maximizing the transmission of the pump mechanism's suction force to the slag collection basket, thereby increasing the water flow rate at the slag collection basket and improving both the slag collection and return water effects.

[0025] Preferably, the return water chamber is a rectangular area, with one end of the rectangular area arranged near a corner of the tank and the second end arranged near the center of the tank. The sludge collection area is arranged near the first end of the rectangular area. This arrangement is beneficial for achieving excellent filtration and sludge collection effects.

[0026] Preferably, the bottom of the box is provided with a heating element located in the return water cavity and near the second end of the rectangular area.

[0027] Preferably, the inner bottom wall of the housing slopes downwards gradually from the edge towards the return water chamber to form a guide surface. Preferably, the upper surface of the filter plate slopes downwards gradually from the edge towards the slag collection basket to form a guide slope.

[0028] Preferably, the bottom of the tank has a water softener outlet located outside the return water chamber and near the first end of the rectangular area.

[0029] As an improvement, the bottom of the return water chamber has a drain outlet corresponding to the lower end of the slag collection basket. The lower end of the power output shaft of the drive component protrudes from the bottom of the drive component and is connected to a drain impeller. The bottom of the drive component has a drain chamber arranged around the drain impeller, which is connected to the drain outlet through a water guide pipe. This structure can complete the return water and drainage actions using the same drive mechanism, simplifying the overall structure.

[0030] Preferably, the side of the drainage chamber is connected to a drain pipe for supplying and draining water, and the bottom of the box is provided with a valve that can connect or disconnect the drain pipe.

[0031] Preferably, the bottom wall height of the guide zone is no higher than the bottom wall height of the return water chamber and lower than the height of the drain outlet. This structure further prevents air bubbles from entering the return water.

[0032] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides a filter structure that can constrain the filter plate to the top of the return water chamber through self-priming. The filter plate is provided with a retractable overlapping piece on its edge. When the filter plate is placed on the top of the return water chamber, the first magnetic component and the second magnetic component attract each other to limit the position of the filter plate. During this process, the overlapping piece can automatically extend and retract to adapt to the size of the filter plate and the opening at the top of the return water chamber. This not only facilitates disassembly and assembly but also maintains the sealing of the connection between the filter plate and the top edge of the return water chamber, preventing residue from entering the return water chamber and participating in the return water. This helps to avoid clogging of the spray arm and improve the cleaning efficiency. In addition, it reduces the precision requirements for the size of the return water chamber and the filter plate during production, which helps to reduce production costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A sectional view;

[0035] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0036] Figure 4 for Figure 1 A schematic diagram of the structure of the hidden spray arm;

[0037] Figure 5 for Figure 4 A schematic diagram of the hidden filter plate in the middle;

[0038] Figure 6 for Figure 5 A schematic diagram of the structure of the hidden slag collection basket and baffle;

[0039] Figure 7 This is a schematic diagram of the baffle structure in an embodiment of the present invention;

[0040] Figure 8 This is an assembly diagram of the filter plate, overlapping piece, and first magnetic component in an embodiment of the present invention;

[0041] Figure 9 for Figure 8 A sectional view;

[0042] Figure 10 for Figure 9 Exploded view;

[0043] Figure 11 This is a schematic diagram of the filter structure in this embodiment. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0045] like Figures 1-7 As shown, the cleaning machine of this embodiment includes a housing 1 and a slag collection basket 2. The bottom of the housing 1 is provided with a recessed return water chamber 11. The top of the return water chamber 11 is covered by a filter plate 12. The lower part of the slag collection basket 2 is accommodated in the return water chamber 11 and the upper end is exposed above the filter plate 12. The bottom of the housing 1 is provided with a guide area 13 that communicates with the return water chamber 11. The top of the guide area 13 is provided with a baffle 3 that can cover it. The bottom of the housing 1 is provided with a pumping mechanism 4 that can pump water from the return water chamber 11 through the guide area 13 to the baffle 3.

[0046] In this embodiment, the pumping mechanism 4 is an open-type water pump, including a spray arm 41, an impeller assembly 42, and a drive unit 43. The spray arm 41 is mounted on the baffle 3. The upper part of the impeller assembly 42 is a centrifugal impeller used to disperse water circumferentially in the flow channel of the spray arm, and the lower part of the impeller assembly 42 is an axial flow impeller used to draw water from the guide area 13 upwards into the spray arm 41. The upper part of the impeller assembly 42 extends through the baffle 3 into the spray arm 41, and the lower part is located in the semi-enclosed space 100 formed by the baffle 3 and the guide area 13. The drive unit 43 is located at the bottom of the housing 1, and the power output shaft 431 passes through the guide area 13 and is connected to the impeller assembly 42. With the above structure, an open-type pipeless water pump is formed by utilizing the semi-enclosed space formed by the baffle 3 and the guide area 13, which facilitates the removal of the baffle 3 for cleaning the inside of the water pump.

[0047] The connection between the spray arm 41 and the baffle 4 is adjacent to and spaced apart from the filter plate 12. Arranging the spray arm 41 beside the filter plate 12 without passing through it facilitates assembly. Furthermore, the pump mechanism 4 does not perform filtration, which avoids residue accumulation and allows the water containing residue to be guided to the filter plate and the sludge collection basket 2 at the maximum speed and with the shortest path, thus improving the sludge collection effect.

[0048] The aforementioned semi-enclosed space 100 and the inner cavity of the spray arm 41 used to house the upper part of the impeller assembly 42 together constitute the pump chamber of the pumping mechanism 4, and the connection between the flow guiding area 13 and the return water chamber 11 constitutes the water inlet 401 of the pump chamber. This structure facilitates the formation of an open water pump structure without pipelines.

[0049] In this embodiment, the upper surface of the baffle 3 is smoothly connected to the inner bottom wall of the housing 1. The edge of the baffle 3 extends outward and downward at the corresponding pump inlet 401 to form a water guiding surface 31 arranged near the side of the slag collection basket 2. This water guiding surface 31 is a slightly concave arc surface. The upper surface of the baffle 3 is roughly flush with the bottom wall of the housing 1, so it will not obstruct the return water and can make the return water flow quickly to the filter plate 12, which is beneficial to improve the return water speed and avoid the accumulation of residue near the spray arm 41.

[0050] A perimeter 32 is formed at the outer edge of the water guiding surface 31, which partially surrounds the side of the slag collection basket 2 and extends longitudinally. The height of the lower edge of the perimeter 32 is lower than the height of the top water absorption surface of the slag collection basket 2. A guide plate 21 is formed near the filter plate 12, which slopes downward from the edge to the center. The height of the lower edge of the guide plate 21 is the height of the water absorption surface of the slag collection basket 2. The lower edge of the perimeter 32 is lower than the height of the water absorption surface. In effect, the height of the water absorption surface of the pumping mechanism 4 is lowered to below the water absorption surface of the slag collection basket 2 for slag collection and water return, which can avoid the intake of air bubbles and improve the performance of the pump.

[0051] A water inlet 411 is provided on the bottom wall of the spray arm 41. Correspondingly, a guide sleeve 33 is provided in the middle of the baffle 3, which runs vertically through the baffle and connects with the water inlet 411. The lower part of the impeller assembly 42 is located in the guide sleeve 33. The spray arm 41 is rotatably mounted on the top of the guide sleeve 33 by means of a retaining ring. The specific rotatable connection structure is a mature existing technology and will not be described in detail again.

[0052] In this embodiment, the pumping mechanism 4 and the flow guiding area 13 are located at the center of the bottom of the tank 1, and the return water chamber 11 is arranged near the edge of the bottom of the tank 1 and located beside the flow guiding area 13. Since the top of the flow guiding area 13 is covered by the baffle 3, the above structure ensures that the central part of the tank 1 remains flat and there is no assembly structure that would obstruct residue and return water, which is beneficial to improving the return water effect and the residue collection effect.

[0053] The bottom of the return water chamber 11 is recessed near the guide area 13 to form a slag collection area 14. A drain outlet 141 is located at the bottom of this slag collection area 14. The lower part of the slag collection basket 2 is housed within this slag collection area 14, with its lower end positioned corresponding to the drain outlet 141. The sidewall of the slag collection area 14 near the guide area 13 forms a guide slope 142 that gradually slopes upwards along the water flow. This structure ensures that the water inlet 401 of the pumping mechanism 4 maintains the shortest distance from the return water slag collection point, maximizing the transmission of the pumping mechanism 4's suction force to the slag collection basket 2. This increases the water flow rate at the slag collection basket 2, improving both the slag collection and return water effects.

[0054] In this embodiment, the return water chamber 11 is a rectangular area. The first end of the rectangular area is arranged near one corner of the housing 1, and the second end is arranged near the middle of the housing 1. The slag collection area 14 is arranged near the first end of the rectangular area. This arrangement is conducive to achieving excellent filtration and slag collection effects.

[0055] A heating element 5 is located at the bottom of the tank body 1, within the return water chamber 11, and positioned at the second end near the rectangular area. The inner bottom wall of the tank body 1 slopes downwards from the edge towards the return water chamber 11, forming a guide surface 10. The upper surface of the filter plate 12 slopes downwards from the edge towards the sludge collection basket 2, forming a guide slope 121. A water softener outlet 6 is located at the bottom of the tank body 1, outside the return water chamber 11, and positioned at the first end near the rectangular area.

[0056] In this embodiment, the lower end of the power output shaft 431 of the drive component 43 protrudes from the bottom of the drive component 43 and is connected to a drainage impeller 7. A drainage chamber 430 is provided at the bottom of the drive component 43, surrounding the drainage impeller 7. The drainage chamber 430 is connected to the drain outlet 141 through a water guide pipe 432. This structure can complete the return water and drainage actions using the same drive mechanism, simplifying the overall structure. A drain pipe for supplying and draining water is connected to the side of the drainage chamber 430, and a valve that can connect or disconnect the drain pipe is provided at the bottom of the housing 1.

[0057] In this embodiment, the bottom wall height of the flow guiding area 13 is no higher than the bottom wall height of the return water chamber 11 and lower than the bottom of the slag collection area 14 and the height of the drain outlet 141. This structure can further prevent air bubbles from entering the return water.

[0058] The cleaning method in this embodiment is completed using the cleaning described above, and includes the following steps:

[0059] (1) Add water to tank 1, and stop adding water after the required amount of water has been reached;

[0060] When the drive mechanism 4 is running, the power output shaft 431 rotates forward, driving the impeller assembly 42 to rotate forward. The impeller assembly 42 pumps the water from the return water chamber 11 through the guide area 13 to the spray arm 41 and sprays it upward. The water that falls after being sprayed is filtered again by the filter plate 12, and the slag is collected by the slag collection basket 2 before entering the return water chamber 11. During this process, the drainage impeller 7 idles and does not drain water.

[0061] (2) After cleaning, the drive mechanism 4 runs, the power output shaft 431 reverses, and the drainage impeller 7 drains the water in the return water chamber 11 through the drain outlet 141, the water guide pipe 432, and the drainage chamber 430. During this process, the impeller assembly 42 reverses to form an airflow along the direction of the spray arm 41, the guide area 13, and the return water chamber 11. This airflow can improve the drainage speed and the degree of drainage.

[0062] In this embodiment, the filter structure at the bottom of the housing 1 can achieve a good seal to prevent residue from entering the return water chamber 11 and participating in the return water.

[0063] Specifically, such as Figures 8-11 As shown, the filter plate 12 covers the top of the return water chamber 11. A retractable overlapping piece 8 is connected to the edge of the filter plate 12. A first magnetic element 81 is provided at the outer edge of the overlapping piece 8. Correspondingly, a second magnetic element 82 that can attract the first magnetic element 81 is provided at the top edge of the return water chamber 11.

[0064] A first slot 801 extending circumferentially is provided at the outer edge of the overlapping piece 8. Correspondingly, the inner ring 811 of the first magnetic element 81 is embedded in the first slot 801, and the outer ring 812 protrudes outside the first slot 801. The cross-sections of the first slot 801 and the inner ring 811 of the first magnetic element 81 are formed into a matching T-shaped structure. A second slot 111 is opened at the top edge of the return water cavity 11, facing the edge of the filter plate 12, and the second magnetic element 82 is embedded in the second slot 111.

[0065] In this embodiment, the top of the return water cavity 11 is provided with an overlapping platform 112 with an L-shaped cross-section. The second slot 111 is formed on the inner sidewall of the vertical part of the L-shaped structure. In the assembled state, the exposed sidewall of the second magnetic component 82 is flush with the inner sidewall of the vertical part of the L-shaped structure. The above structure provides installation space for the filter plate 12 and maintains the flatness of each assembly surface to improve sealing and avoid gaps that may allow residue leakage. In the assembled state, the outer peripheral wall of the outer ring 812 of the first magnetic component 81 matches the shape of the exposed sidewall of the second magnetic component 82. The upper wall surface of the outer ring 812 of the first magnetic component 81 is flush with the upper wall surface of the edge of the overlapping piece 8, and the lower wall surface is flush with the lower wall surface of the edge of the overlapping piece 8. This structure helps to further improve the sealing between the edge of the filter plate 12 and the top of the return water cavity 11 after installation.

[0066] In this embodiment, the filter plate 12 is a metal plate, and the overlapping piece 8 is a rubber sheet with an S-shaped cross-section. For ease of connection, the inner edge of the overlapping piece 8 is fused and / or snapped onto the outer edge of the filter plate 12. When the overlapping piece 8 is fused to the filter plate 12, its inner edge overlaps the filter plate 12 above and / or below it. When the overlapping piece 8 is snapped onto the filter plate 12, a snap-fit ​​opening 120 is provided on the filter plate 12, and the inner edge of the overlapping piece 8 overlaps the filter plate 12 and covers the snap-fit ​​opening 120. A snap-fit ​​foot 83 protrudes from the bottom of the overlapping piece 8 and engages with the snap-fit ​​opening 120. In this embodiment, the overlapping piece 8 and the filter plate 12 are connected by a snap-fit ​​connection.

[0067] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A filter structure for a cleaning machine, comprising a return water chamber (11) and a filter plate (12), wherein the filter plate (12) covers the top of the return water chamber (11), characterized in that: The filter plate (12) is connected to a retractable overlap piece (8) at its edge. A first magnetic element (81) is provided at the outer edge of the overlap piece (8). Correspondingly, a second magnetic element (82) that can attract the first magnetic element (81) is provided at the top edge of the return water cavity (11). The inner edge of the overlapping piece (8) is fused and / or snapped with the outer edge of the filter plate (12). When the overlapping piece (8) and the filter plate (12) are fused together, the inner edge of the overlapping piece (8) overlaps above and / or below the filter plate (12). When the overlapping piece (8) and the filter plate (12) are snapped together, the filter plate (12) has a snap-fit ​​opening (120). The inner edge of the overlapping piece (8) overlaps above the filter plate (12) and covers the snap-fit ​​opening (120). The bottom of the overlapping piece (8) is provided with a snap-fit ​​foot (83) that can engage with the snap-fit ​​opening (120). The filter plate (12) is a metal plate, the overlapping piece (8) is a rubber sheet, and the cross-section of the overlapping piece (8) has an S-shaped structure.

2. The filter structure for a cleaning machine according to claim 1, characterized in that: The outer edge of the lap piece (8) is provided with a first slot (801) extending circumferentially. Correspondingly, the inner ring (811) of the first magnetic element (81) is embedded in the first slot (801), and the outer ring (812) is exposed outside the first slot (801).

3. The filter structure for a cleaning machine according to claim 2, characterized in that: The cross-sections of the first slot (801) and the inner ring (811) of the first magnetic element (81) are formed into a matching T-shaped structure.

4. The filter structure for a cleaning machine according to claim 2, characterized in that: The top edge of the return water chamber (11) has a second slot (111) arranged toward the edge of the filter plate (12), and the second magnetic element (82) is embedded in the second slot (111).

5. The filter structure for a cleaning machine according to claim 4, characterized in that: The top of the return water cavity (11) is provided with an overlapping platform (112) with an L-shaped cross-section. The second slot (111) is opened on the inner side wall of the vertical part of the L-shaped structure. When the assembly is completed, the exposed side wall of the second magnetic component (82) is flush with the inner side wall of the vertical part of the L-shaped structure.

6. The filter structure for a cleaning machine according to claim 5, characterized in that: In the assembled state, the outer peripheral wall of the outer ring (812) of the first magnetic component (81) matches the shape of the exposed side wall of the second magnetic component (82). The upper wall surface of the outer ring (812) of the first magnetic component (81) is flush with the upper wall surface of the edge of the overlapping piece (8), and the lower wall surface is flush with the lower wall surface of the edge of the overlapping piece (8).

7. A cleaning machine, characterized in that: Includes a housing and a filter structure as described in any one of claims 1 to 6, wherein the return water chamber (11) is located at the bottom of the housing (1).

8. The cleaning machine according to claim 7, characterized in that: It also includes a slag collection basket (2), the lower part of which is housed in the return water chamber (11) and the upper end is exposed above the filter plate (12). The bottom of the box body (1) is recessed and has a flow guiding area (13) that communicates with the return water chamber (11). The top of the flow guiding area (13) is provided with a baffle (3) that can cover it. The bottom of the box body (1) is provided with a pumping mechanism (4) that can pump water from the return water chamber (11) through the flow guiding area (13) to the baffle (3).

9. The cleaning machine according to claim 8, characterized in that: The pumping mechanism (4) includes a spray arm (41), an impeller assembly (42), and a drive unit (43). The spray arm (41) is located on the baffle (3). The upper part of the impeller assembly (42) extends through the baffle (3) into the spray arm (41), and the lower part is located in the semi-enclosed space (100) formed by the baffle (3) and the guide area (13). The drive unit (43) is located at the bottom of the housing (1), and the power output shaft (431) passes through the guide area (13) and is connected to the impeller assembly (42).

10. The cleaning machine according to claim 9, characterized in that: The connection between the spray arm (41) and the baffle (3) is adjacent to and spaced apart from the filter plate (12).

11. The cleaning machine according to claim 9, characterized in that: The semi-enclosed space (100) and the inner cavity of the spray arm (41) for accommodating the upper part of the impeller assembly (42) together constitute the pump chamber of the pumping mechanism (4), and the connection between the flow guiding area (13) and the return water chamber (11) constitutes the water inlet (401) of the pump chamber.

12. The cleaning machine according to claim 11, characterized in that: The upper surface of the baffle (3) is smoothly connected to the inner bottom wall of the box (1), and the edge of the baffle (3) extends outward and downward at the corresponding pump chamber inlet (401) to form a water guiding surface (31) arranged near the side of the slag collection basket (2).

13. The cleaning machine according to claim 12, characterized in that: The outer edge of the water guiding surface (31) is formed with a surrounding edge (32) that partially surrounds the side of the slag collection basket (2) and extends longitudinally. The height of the lower edge of the surrounding edge (32) is lower than the height of the top water absorption surface of the slag collection basket (2).

14. The cleaning machine according to claim 9, characterized in that: The bottom wall of the spray arm (41) has an inlet (411). Correspondingly, the baffle (3) has a guide sleeve (33) that runs vertically through the middle and is connected to the inlet (411). The lower part of the impeller assembly (42) is located in the guide sleeve (33).

15. The cleaning machine according to any one of claims 8 to 14, characterized in that: The pumping mechanism (4) and the flow guiding area (13) are located in the center of the bottom of the tank (1), and the return water chamber (11) is arranged near the edge of the bottom of the tank (1) and is located on the side of the flow guiding area (13).

16. The cleaning machine according to claim 15, characterized in that: The bottom of the return water chamber (11) is recessed near the flow guiding area (13) to form a slag collection area (14). The bottom of the slag collection area (14) has a drain outlet (141). The lower part of the slag collection basket (2) is housed in the slag collection area (14) and its lower end is arranged corresponding to the drain outlet (141).

17. The cleaning machine according to claim 16, characterized in that: The return water chamber (11) is a rectangular area. The first end of the rectangular area is arranged near one corner of the box body (1), and the second end is arranged near the middle of the box body (1). The slag collection area (14) is arranged near the first end of the rectangular area.

18. The cleaning machine according to claim 17, characterized in that: The bottom of the box (1) is provided with a heating element (5) located in the return water chamber (11) and near the second end of the rectangular area.

19. The cleaning machine according to claim 17, characterized in that: The inner bottom wall of the box (1) gradually slopes downward from the edge toward the return water cavity (11) to form a guide surface (10).

20. The cleaning machine according to claim 17, characterized in that: The bottom of the housing (1) has a water softener outlet (6) located outside the return water chamber (11) and near the first end of the rectangular area.

21. The cleaning machine according to any one of claims 8 to 14, characterized in that: The upper surface of the filter plate (12) gradually slopes downward from the edge toward the slag collection basket (2) to form a guide slope (121).

22. The cleaning machine according to any one of claims 9 to 14, characterized in that: The bottom of the return water chamber (11) has a drain outlet (141) corresponding to the lower end of the slag collection basket (2). The lower end of the power output shaft (431) of the drive member (43) is exposed at the bottom of the drive member (43) and connected to a drain impeller (7). The bottom of the drive member (43) is provided with a drain chamber (430) arranged around the drain impeller (7). The drain chamber (430) is connected to the drain outlet (141) through a water guide pipe (432).

23. The cleaning machine according to claim 22, characterized in that: The side of the drainage chamber (430) is connected to a drain pipe for water to be drained, and the bottom of the box (1) is provided with a valve that can connect or disconnect the drain pipe.

24. The cleaning machine according to claim 22, characterized in that: The bottom wall height of the flow guiding area (13) is not higher than the bottom wall height of the return water chamber (11) and lower than the height of the drain outlet (141).

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