Cleaning machine

Abstract

The utility model relates to a cleaning machine which comprises a box body and a cleaning barrel arranged in the box body, a water return area is concavely arranged at the inner bottom of the cleaning barrel, an impeller assembly is convexly arranged at the water return area, the impeller assembly comprises a disc-shaped impeller cover, the impeller cover covers the water return area to form a water return cavity, and the impeller cover covers the water return cavity. A water leakage hole and an air outlet hole are respectively formed in the impeller cover, the water leakage hole is communicated with the water return cavity, and the driving mechanism is used for driving the impeller cover to rotate forwards and backwards relative to the cleaning barrel by taking the central axis of the impeller cover as the center. According to the utility model, vortexes which always rotate forwards and backwards can be formed, cleaned articles (such as fruits and vegetables and the like) are fully contacted with water, so that dirt on the articles can be fully washed, a better cleaning effect is achieved, and stubborn dirt on the cleaned articles is dispersed by mixing bubbles in water flow, so that a better cleaning effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of household appliances, especially to a cleaning machine. BACKGROUND

[0002] The pulsator type cleaning mode uses the rotation of the pulsator structure to agitate the water flow to realize the cleaning of the articles, and this cleaning mode is especially suitable for the cleaning of fruits and vegetables and can effectively avoid the damage of the surface of the fruits and vegetables during the cleaning process. For example, a Chinese invention patent with the application number CN202111635974.3 (publication number CN114246499A) discloses an imitated hand washing type fruit and vegetable cleaning machine, which comprises a tank body, a cleaning basket located in the tank body, and a driving assembly located below the tank body. The bottom center of the cleaning basket is provided with a pulsator. The cleaning basket and the pulsator are both rotated by the driving assembly. The inner circumferential wall of the cleaning basket is uniformly provided with a plurality of first brushes. The surface center of the pulsator is provided with a second brush. The first brush and the second brush are rotated with the cleaning basket and the pulsator, respectively. For another example, a Chinese utility model patent with the patent number ZL202221126129.3 (authorization announcement number CN217852828U) discloses a cleaning machine, and a Chinese utility model patent with the patent number ZL201922017971.8 (authorization announcement number CN211155418U) discloses an easy-to-clean fruit and vegetable cleaning machine.

[0003] However, in the existing pulsator type cleaning mode, the pulsator structure rotates in one direction, so that the cleaned articles are thrown in the same direction under the action of the rotational force in the same direction, which causes the cleaned articles to be unable to contact the water washing in all directions, resulting in cleaning dead angles and affecting the cleaning effect. In addition, it is also difficult to clean the stubborn dirt on the cleaned articles, which affects the user's experience. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a cleaning machine with good cleaning effect.

[0005] The utility model adopts the technical scheme that a cleaning machine comprises a box body and a cleaning barrel arranged in the box body, the bottom of the cleaning barrel is concave to form a backwater area, and a pulsator assembly is arranged at the backwater area. The pulsator assembly comprises a disc-shaped pulsator cover, the pulsator cover covers the backwater area to form a backwater cavity, and the pulsator cover is provided with a water leakage hole and an air outlet hole. The water leakage hole is communicated with the backwater cavity, and a driving mechanism is arranged to drive the pulsator cover to rotate around the central axis of the pulsator cover relative to the cleaning barrel.

[0006] Furthermore, the water leakage holes and air vents are evenly distributed on the impeller cover, and are spaced apart. This allows air bubbles to be evenly mixed in the water flow, further ensuring the cleaning effect.

[0007] Furthermore, the impeller cover is provided with an air outlet area extending radially therein for arranging the aforementioned air outlets. There are at least two air outlet areas, with the inner ends of each area converging at the center of the impeller cover. The aforementioned water leakage holes are arranged between adjacent air outlet areas. This ensures a uniform distribution of water leakage holes and air outlets on the impeller cover and promotes more even mixing of air bubbles into the water flow.

[0008] Furthermore, each of the aforementioned air outlet zones protrudes upward relative to the upper surface of the impeller cover along its own length. This allows the bubbles formed in each air outlet zone to smoothly enter the vortex formed from bottom to top, enabling the formed bubbles to be mixed into the water flow as much as possible.

[0009] Furthermore, each of the aforementioned air outlet zones is formed by an upward bulge of the wall of the impeller cover to which it is located. This simplifies the structure of the impeller cover and allows for better construction of each air outlet zone on the impeller cover.

[0010] Furthermore, the driving mechanism includes a driving device for driving the washing tub to rotate in both directions and a transmission structure for linking the washing tub with the impeller cover. The driving device drives the washing tub to rotate, and the rotating washing tub drives the impeller cover through the transmission structure, thereby realizing the rotation of the impeller cover relative to the washing tub within the washing tub.

[0011] Furthermore, the transmission structure includes a first thread circumferentially disposed on the inner surface of the aforementioned return water area and a second thread circumferentially disposed on the outer surface of the aforementioned impeller cover. The second thread can form a threaded connection with the first thread, and both can be tightened in both directions. Thus, when the cleaning tank rotates under the drive of the drive device, the impeller cover can rotate relative to the cleaning tank. Furthermore, when the cleaning tank rotates forward, the impeller cover rotates in the opposite direction relative to the cleaning tank, and when the cleaning tank rotates in the opposite direction, the impeller cover rotates in the forward direction relative to the cleaning tank, thus preventing the impeller cover from becoming loose.

[0012] Furthermore, the driving device is a motor located below the cleaning tub and capable of forward and reverse rotation. The output shaft of the driving device extends vertically and is equipped with a transmission seat. A transmission groove is recessed in the center of the bottom wall of the cleaning tub for mounting the transmission seat and forming a transmission connection with it. In this way, the driving device drives the cleaning tub through the linkage between the transmission seat and the transmission groove.

[0013] Furthermore, both the transmission seat and the transmission groove have circular cross-sections. The outer surface of the transmission seat is provided with first limiting protrusions spaced circumferentially, and two adjacent first limiting protrusions form a limiting group. The inner surface of the transmission groove is provided with second limiting protrusions spaced circumferentially, each corresponding to one of the limiting groups.

[0014] In the initial state, each of the second limiting protrusions is located in the middle between the two first limiting protrusions of the corresponding limiting group. In the working state, when each of the second limiting protrusions abuts against any one of the first limiting protrusions in the corresponding limiting group, the drive device rotates. In this way, the cooperation between each of the second limiting protrusions and the corresponding limiting group can limit the movement of the cleaning tank and the impeller cover, ensuring that the cleaning tank and the impeller cover rotate smoothly back and forth.

[0015] Furthermore, the return water chamber is equipped with air chambers communicating with each air outlet. The aforementioned drive device is located below the upper cleaning tub. The output shaft of this drive device extends vertically and is a hollow tube. The upper port of the output shaft is fluidly connected to the air inlet of the air chamber, while the lower port is fluidly connected to the air outlet of the atmospheric pump. In this way, the atmospheric pump can pump air into the air chamber through the hollow output shaft, ensuring that air continuously enters the water flow through each air outlet during operation. By using the output shaft of the drive device to transport air, there is no need for separate air supply pipes, thus simplifying the internal structure of the cleaning machine.

[0016] Furthermore, it also includes a base sleeved on the upper end of the output shaft and fitted with a clearance fit on the outer surface of the upper end. The base and the corresponding part of the impeller cover are fastened together to form the air cavity, and the upper end of the output shaft extends into the air cavity. On the one hand, it can better construct the air cavity structure in the return water cavity, and on the other hand, it can allow air to smoothly enter the air cavity through the output shaft.

[0017] Furthermore, the base is fitted onto the upper end of the output shaft through a central hole, and an annular gap is formed circumferentially between the wall of the central hole and the outer surface of the upper end of the output shaft. A first sealing ring is also included to seal this annular gap. This prevents air leakage through the annular gap.

[0018] Furthermore, it also includes a one-way valve for controlling the connection between the lower port of the aforementioned output shaft and the outlet port of the aforementioned atmospheric pump.

[0019] Furthermore, the one-way valve includes a vertically extending housing, which is hollow inside. The air inlet at the lower end of the housing is in fluid communication with the air outlet of the aforementioned atmospheric pump, while the air outlet at the upper end is connected to the lower port of the aforementioned output shaft. A disc-shaped mounting base is horizontally spaced at the center of the housing's inner cavity along its height direction. The mounting base has a vertically penetrating and downward-protruding guide sleeve at its center.

[0020] The aforementioned one-way valve also includes a control element and a return spring. The control element comprises a vertically extending rod and a seat protruding circumferentially from the lower end of the rod. The air inlet port is circumferentially narrowed relative to the housing portion above it, forming an annular step at their junction. The rod of the control element is movably inserted into the guide sleeve and circumferentially clearance-fitted with the inner circumferential surface of the guide sleeve. The seat rests on the annular step. The return spring is sleeved on the rod and clamped between the mounting base and the seat of the control element.

[0021] Furthermore, in the initial state, the aforementioned seat rests on the aforementioned ring step and the aforementioned air inlet port is closed. At this time, the one-way valve disconnects the connection between the lower port of the output shaft and the air outlet of the atmospheric pump. In the working state, the aforementioned atmospheric pump operates, the aforementioned seat disengages from the ring step and opens the air inlet port, and the aforementioned return spring is compressed, causing the seat to tend to move downwards to return to its original position and close the air inlet port. In addition, the lower port of the output shaft is connected to the air outlet of the atmospheric pump through the one-way valve, ensuring that air can be smoothly introduced into the air chamber through the output shaft.

[0022] Compared with the prior art, the advantages of this utility model are as follows: the impeller cover of this utility model can rotate back and forth relative to the washing tub with its central axis as the center under the drive mechanism, so that the water in the washing tub can form a vortex that sometimes rotates forward and sometimes rotates backward. The items being washed (such as fruits and vegetables) can fully come into contact with the water, thereby fully rinsing the dirt on the items and achieving a better cleaning effect.

[0023] Furthermore, the impeller cover is equipped with drainage holes and air vents, which allows the water flow to carry air bubbles. When the vortex containing air bubbles is sprayed toward the items being cleaned, the air bubbles in the water flow come into contact with the items, burst, and generate a large impact force, thereby dispersing stubborn dirt on the items being cleaned and achieving a better cleaning effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cleaning machine in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A structural diagram from another direction;

[0026] Figure 3 This is a cross-sectional view of the cleaning machine in an embodiment of this utility model;

[0027] Figure 4 for Figure 3 Enlarged view of section A;

[0028] Figure 5 for Figure 3 Enlarged view of section B;

[0029] Figure 6 This is a partial exploded view of the cleaning machine in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the cleaning bucket in an embodiment of this utility model;

[0031] Figure 8 This is a partial exploded view of the cleaning bucket in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the impeller cover in an embodiment of the present invention. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] like Figures 1-9 As shown, a cleaning machine includes a housing 1 and a cleaning tub 2 disposed within the housing 1. The bottom of the cleaning tub 2 has a recessed water return area 21, and a pulsator assembly protrudes from this water return area 21. Further, the pulsator assembly includes a disc-shaped pulsator cover 4, which covers the water return area 21 to form a water return cavity 210. The pulsator cover 4 has a drain hole 41 and an air vent 42, wherein the drain hole 41 communicates with the water return cavity 210. The machine also includes a drive mechanism for driving the pulsator cover 4 to rotate back and forth relative to the cleaning tub 2 around its central axis.

[0036] As can be seen from the above, the impeller cover 4 of this utility model can rotate back and forth relative to the washing tub 2 around its central axis under the drive of the drive mechanism. This allows the water in the washing tub 2 to form a vortex that rotates sometimes forward and sometimes backward, ensuring that the items being washed (such as fruits and vegetables) come into full contact with the water, thus thoroughly rinsing away dirt and achieving a better cleaning effect. Furthermore, the impeller cover 4 is provided with a drain hole 41 and an air outlet 42, which allows air bubbles to be carried in the water flow. When the vortex containing air bubbles is sprayed towards the items being washed, the air bubbles in the water flow come into contact with the items, burst, and generate a large impact force, thereby dispersing stubborn dirt on the items and achieving an even better cleaning effect.

[0037] Preferably, the aforementioned drain holes 41 and air vents 42 are evenly distributed on the impeller cover 4, and are spaced apart, so that bubbles are evenly mixed in the water flow, further ensuring the cleaning effect. More preferably, the impeller cover 4 is provided with air venting areas 43 extending along its radial direction for arranging the air vents 42. There are three air venting areas 43, and the inner ends of each air venting area 43 converge at the center of the impeller cover 4, while the aforementioned drain holes 41 are arranged between adjacent air venting areas 43. This achieves even distribution of drain holes 41 and air vents 42 on the impeller cover 4, and promotes more even mixing of bubbles into the water flow. Even more preferably, each of the aforementioned air venting areas 43 protrudes upward relative to the upper surface of the impeller cover 4 along its own length direction, so that the bubbles formed in each air venting area 43 can smoothly enter the vortex formed from bottom to top, so that the formed bubbles can be mixed into the water flow as much as possible. In this embodiment, each of the above-mentioned air outlet zones 43 is formed by the upward bulging of the cover wall of the impeller cover 4, thereby simplifying the structure of the impeller cover 4 and enabling the construction of each air outlet zone 43 on the impeller cover 4.

[0038] Furthermore, the aforementioned drive mechanism includes a drive device 5 for driving the cleaning tub 2 to rotate in both directions and a transmission structure for linking the cleaning tub 2 with the impeller cover 4. The drive device 5 drives the cleaning tub 2 to rotate, and the rotating cleaning tub 2 drives the impeller cover 4 through the transmission structure, thereby realizing the rotation of the impeller cover 4 relative to the cleaning tub 2 within the cleaning tub 2. Further, the aforementioned transmission structure includes a first thread 211 circumferentially disposed on the inner surface of the return water area 21 and a second thread 44 circumferentially disposed on the outer surface of the impeller cover 4. The second thread 44 can form a threaded connection with the first thread 211, and both can be tightened in both directions. Figure 6 As shown. In this way, when the cleaning tub 2 rotates under the drive of the drive device 5, the impeller cover 4 can rotate relative to the cleaning tub 2. When the cleaning tub 2 rotates in the forward direction, the impeller cover 4 rotates in the reverse direction relative to the cleaning tub 2, and when the cleaning tub 2 rotates in the reverse direction, the impeller cover 4 rotates in the forward direction relative to the cleaning tub 2. And during the rotation, the impeller cover 4 can be prevented from becoming loose.

[0039] Furthermore, the aforementioned drive device 5 is a motor installed below the aforementioned cleaning tub 2 and capable of forward and reverse rotation. The output shaft 51 of the drive device 5 extends vertically and is equipped with a transmission seat 52. A transmission groove 22 is recessed in the center of the bottom wall of the aforementioned cleaning tub 2 for mounting the transmission seat 52 and forming a transmission connection with it. In this way, the drive device 5 drives the cleaning tub 2 through the linkage between the transmission seat 52 and the transmission groove 22.

[0040] Furthermore, both the transmission seat 52 and the transmission groove 22 have circular cross-sections. The outer surface of the transmission seat 52 is provided with first limiting protrusions 5211 spaced circumferentially, and adjacent first limiting protrusions 5211 form limiting groups 521. The inner surface of the transmission groove 22 is provided with second limiting protrusions 221 spaced circumferentially, corresponding one-to-one with the limiting groups 521. Initially, each second limiting protrusion 221 is located in the middle between the two first limiting protrusions 5211 of its corresponding limiting group 521. In operation, when each second limiting protrusion 221 abuts against any one of the first limiting protrusions 5211 in its corresponding limiting group 521, the drive device 5 rotates. Thus, the cooperation between the second limiting protrusions 221 and the corresponding limiting groups 521 enables the limiting of the cleaning tub 2 and the impeller cover 4, ensuring smooth back-and-forth rotation of both.

[0041] Furthermore, the aforementioned return water chamber 210 is provided with an air chamber 2101 that communicates with each air outlet 42. The output shaft 51 of the aforementioned drive device 5 extends vertically and is a hollow tube. The upper end of the output shaft 51 is fluidly connected to the air inlet 2102 of the aforementioned air chamber 2101, and the lower end is fluidly connected to the air outlet of the atmospheric pump (not shown). In this way, the atmospheric pump can pump air into the air chamber 2101 through the hollow output shaft 51, ensuring that air continuously enters the water flow through each air outlet 42 during operation. By using the output shaft 51 of the drive device 5 to transport air, there is no need to set up a separate air supply pipe, thereby simplifying the internal structure of the cleaning machine. Furthermore, it also includes a base 7 that is sleeved on the upper end of the aforementioned output shaft 51 and has a clearance fit with the outer surface of the upper end. The base 7 is snapped together with the corresponding part of the aforementioned impeller cover 4 to form the aforementioned air chamber 2101, and the upper end of the output shaft 51 extends into the air chamber 2101. On the one hand, it can better construct the air chamber 2101 structure in the return water chamber 210, and on the other hand, it can allow air to smoothly enter the air chamber 2101 through the output shaft 51. Preferably, the base 7 is sleeved on the upper end of the output shaft 51 through its central hole, and there is an annular gap in the circumferential direction between the hole wall of the central hole and the outer surface of the upper end of the output shaft 51. It also includes a first sealing ring 61 for sealing the annular gap, thereby preventing air leakage through the annular gap.

[0042] Furthermore, it also includes a one-way valve 8 for controlling the connection and disconnection between the lower port of the output shaft 51 and the air outlet of the atmospheric pump. Specifically, in this embodiment, the one-way valve 8 includes a vertically extending housing 81, which is hollow inside. The air inlet port 811 at the lower end of the housing 81 is in fluid communication with the air outlet of the atmospheric pump, while the air outlet port 812 at the upper end is connected to the lower port of the output shaft 51. A disc-shaped mounting seat 82 is horizontally spaced at the center of the inner cavity of the housing 81 along its height direction. The center of the mounting seat 82 has a vertically penetrating and downwardly protruding guide sleeve 821. The one-way valve 8 also includes a control element 83 and a return spring 84. The control element 83 includes a vertically extending rod 831 and a seat 832 protruding circumferentially at the lower end of the rod 831. The air inlet port 811 narrows circumferentially relative to the housing 81 above it, forming an annular step 813 at their junction. The rod 831 of the control member 83 is movably inserted into the guide sleeve 821 and circumferentially clearance-fitted with the inner circumferential surface of the guide sleeve 821. The seat 832 rests on the annular step 813. The return spring 84 is sleeved on the rod 831 and clamped between the mounting base 82 and the seat 832 of the control member 83. In the initial state, the seat 832 rests on the annular step 813, closing the air inlet port 811. At this time, the one-way valve 8 disconnects the lower port of the output shaft 51 from the air outlet of the atmospheric pump. In operation, the aforementioned atmospheric pump operates, the aforementioned seat 832 disengages from the ring step 813 and opens the air inlet port 811, while the aforementioned return spring 84 is compressed and causes the seat 832 to tend to move downward to return and close the air inlet port 811. In addition, the lower port of the output shaft 51 is connected to the air outlet of the atmospheric pump through a one-way valve 8, ensuring that air can be smoothly introduced into the air chamber 2101 through the output shaft 51.

[0043] Furthermore, in this embodiment, the aforementioned box 1 is barrel-shaped and nested inside and outside the aforementioned cleaning tub 2. The aforementioned driving device 5 is located at the bottom of the box 1, and a second sealing ring 62 is provided at the connection between the bottom wall of the box 1 and the output shaft 51 of the aforementioned driving device 5. A base 3 is provided at the bottom of the box 1, and the lower end of the aforementioned output shaft 51 passes through the base 3, with a third sealing ring 63 provided at the passage. In this embodiment, a drain outlet 11 is provided on the bottom wall of the aforementioned box 1, and a filter basket 12 is provided at the drain outlet 11, such as... Figure 3 As shown. Similarly, in this embodiment, in order to achieve drainage, an openable and closable drainage opening can be made on the bottom wall of the washing tub 2, and a filter basket can be installed at the opening, so that the washing water of the washing tub 2 can be discharged into the tank 1, and then discharged into the sewer.

[0044] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter 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. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A cleaning machine, comprising a housing (1) and a cleaning tub (2) disposed within the housing (1), wherein the bottom of the cleaning tub (2) is recessed into a water return area (21) and a pulsator assembly is protruding from the water return area (21), characterized in that, The impeller assembly includes a disc-shaped impeller cover (4), which covers the water return area (21) to form a water return cavity (210). The impeller cover (4) is provided with a drain hole (41) and an air outlet (42), wherein the drain hole (41) communicates with the water return cavity (210). The assembly also includes a drive mechanism for driving the impeller cover (4) to rotate back and forth relative to the washing tub (2) with its central axis as the center.

2. The cleaning machine as described in claim 1, characterized in that, The water leakage hole (41) and the air outlet (42) are evenly distributed on the impeller cover (4) and are spaced apart.

3. The cleaning machine as described in claim 2, characterized in that, The impeller cover (4) is provided with an air outlet area (43) extending in its radial direction for arranging the air outlet (42). There are at least two air outlet areas (43), and the inner ends of each air outlet area (43) converge at the center of the impeller cover (4). The water leakage hole (41) is arranged between adjacent air outlet areas (43).

4. The cleaning machine as described in claim 3, characterized in that, Each of the air outlet zones (43) protrudes upward relative to the upper surface of the impeller cover (4) along its own length direction.

5. The cleaning machine as described in claim 4, characterized in that, Each of the air outlet zones (43) is formed by the upward bulging of the wall of the impeller cover (4) to which it is located.

6. The cleaning machine according to any one of claims 1 to 5, characterized in that, The drive mechanism includes a drive device (5) for driving the cleaning tub (2) to rotate in both directions and a transmission structure for linking the cleaning tub (2) with the impeller cover (4).

7. The cleaning machine as described in claim 6, characterized in that, The transmission structure includes a first thread (211) arranged circumferentially on the inner side of the return water area (21) and a second thread (44) arranged circumferentially on the outer side of the impeller cover (4). The second thread (44) can form a threaded connection with the first thread (211) and the two can be tightened in both directions.

8. The cleaning machine as described in claim 6, characterized in that, The drive device (5) is a motor that is installed below the cleaning tub (2) and can rotate in both directions. The output shaft (51) of the drive device (5) extends vertically and is equipped with a transmission seat (52). The center of the bottom wall of the cleaning tub (2) is recessed with a transmission groove (22) for the transmission seat (52) to be installed and to form a transmission connection with it.

9. The cleaning machine as described in claim 8, characterized in that, Both the transmission seat (52) and the transmission groove (22) have circular cross-sections. The outer surface of the transmission seat (52) is provided with first limiting protrusions (5211) spaced apart circumferentially. Adjacent first limiting protrusions (5211) form limiting groups (521). The inner surface of the transmission groove (22) is provided with second limiting protrusions (221) spaced apart circumferentially, corresponding one-to-one with the limiting groups (521). In the initial state, each second limiting protrusion (221) is located in the middle between the two first limiting protrusions (5211) of the corresponding limiting group (521). In the working state, when each second limiting protrusion (221) abuts against any one of the first limiting protrusions (5211) in the corresponding limiting group (521), the above-mentioned drive device (5) turns.

10. The cleaning machine as described in claim 6, characterized in that, The return water chamber (210) is provided with an air chamber (2101) that communicates with each air outlet (42). The drive device (5) is a motor installed below the upper cleaning tub (2). The output shaft (51) of the drive device (5) extends vertically and is a hollow tube. The upper port of the output shaft (51) is fluidly connected to the air inlet (2102) of the air chamber (2101), and the lower port is fluidly connected to the air outlet of the atmospheric pump.

11. The cleaning machine as described in claim 10, characterized in that, It also includes a base (7) that is sleeved on the upper end of the output shaft (51) and has a clearance fit with the outer side of the upper end. The base (7) is fastened to the corresponding part of the impeller cover (4) to form the air cavity (2101), and the upper port of the output shaft (51) extends into the air cavity (2101).

12. The cleaning machine as described in claim 11, characterized in that, The base (7) is sleeved on the upper end of the output shaft (51) through a central hole thereon, and there is an annular gap in the circumferential direction between the hole wall of the central hole and the outer side of the upper end of the output shaft (51), and also includes a first sealing ring (61) for sealing the annular gap.

13. The cleaning machine as described in claim 10, characterized in that, It also includes a one-way valve (8) for controlling the opening and closing of the lower port of the above-mentioned output shaft (51) and the air outlet of the above-mentioned atmospheric pump.

14. The cleaning machine as described in claim 13, characterized in that, The one-way valve (8) includes a vertically extending housing (81) that is hollow inside. The air inlet (811) at the lower end of the housing (81) is in fluid communication with the air outlet of the atmospheric pump, while the air outlet (812) at the upper end is connected to the lower port of the output shaft (51). A disc-shaped mounting seat (82) is horizontally spaced at the center of the inner cavity of the housing (81) along its height direction. The center of the mounting seat (82) has a vertically penetrating and downwardly protruding guide sleeve (821). The aforementioned one-way valve (8) further includes a control element (83) and a return spring (84). The control element (83) includes a vertically extending rod (831) and a seat (832) protruding circumferentially from the lower end of the rod (831). The air inlet port (811) is circumferentially narrowed relative to the housing (81) above it, forming an annular step (813) at the junction of the two. The rod (831) of the control element (83) is movably inserted into the guide sleeve (821) and has a circumferential clearance fit with the inner circumferential surface of the guide sleeve (821). The seat (832) can rest on the annular step (813). The return spring (84) is sleeved on the rod (831) and clamped between the mounting base (82) and the seat (832) of the control element (83). Furthermore, in the initial state, the aforementioned seat (832) rests on the aforementioned ring step (813) and closes the aforementioned air intake port (811). In the working state, the aforementioned atmospheric pump operates, the aforementioned seat (832) disengages from the aforementioned ring step (813) and opens the aforementioned air intake port (811), and the aforementioned return spring (84) is compressed, causing the aforementioned seat (832) to tend to move down and reset, thus closing the aforementioned air intake port (811).

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