Flow channel structure for cleaning machine and cleaning machine

Abstract

The present invention relates to a flow channel structure for a cleaning machine and a cleaning machine, wherein the flow channel structure comprises a shell, wherein a first through hole and a drain outlet are provided on the shell, wherein a water flow channel connecting the first through hole and the drain outlet is provided inside the shell, wherein the height of the drain outlet is lower than the height of the first through hole, and along the water flow direction, the first through hole is located upstream of the drain outlet; wherein the water flow channel comprises an upward section extending upward from the first through hole, and the lower end of the upward section is fluidly connected with the first through hole; and a downward section extending downward from the upper end of the upward section to be fluidly connected with the drain outlet, and the downward section is fluidly connected with the upward section. The water flow channel of the present invention is more likely to form a siphon phenomenon, thereby allowing water to flow continuously and rapidly from the first through hole to the drain outlet.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen appliances, and in particular to a flow channel structure for a cleaning machine and the cleaning machine. Background Art

[0002] A dishwasher is a device that sprays cold or hot water onto dishes to remove dirt adhering to the dishes and clean the dishes. After the dishwasher completes its washing work, it is very important to dry the dishes. Lack of drying will cause moisture in the dishwashing cavity and easily produce bacteria, mold, and odor. However, when the dishes are drying, the air pressure inside the inner tank increases. At this time, it is also very important to maintain the balance of air pressure inside and outside the inner tank. Existing dishwashers generally add hot air drying, respirator modules, etc. separately, which requires opening corresponding holes on the side wall of the inner tank. Not only is the installation troublesome, but if the seal is not in place, the dishwasher may leak during normal use, affecting the reliable operation of the dishwasher.

[0003] In response to the above problems, the Chinese utility model patent with patent number CN202020489930.9 (publication number CN 212788423 U) discloses a "combined structure of water tank washing machine water inlet and outlet hot air drying", which includes a cover plate, a hole, a hot air channel, a water drainage channel, an overflow channel and a water inlet channel; the hole is arranged on the side of the tank body, and the hot air channel, the water drainage channel, the overflow channel and the water inlet channel are all connected to the hole; the cover plate is arranged on the hole, the hot air channel, the water drainage channel, the overflow channel and the water inlet channel. In response to the technical problem that the hot air drying module of the water tank dishwasher in the prior art needs to be separately provided with a hole, resulting in water leakage in the tank body, its hot air drying channel shares the same hole connected to the tank body with the drainage and water inlet channels, and does not need to be separately provided with a hole on the tank body, thereby reducing the risk of water leakage in the tank body and improving the operating reliability of the cleaning machine.

[0004] The above patent realizes multiple functions by opening one hole, but the design of the overflow channel of the patent may make the water flow not smooth enough when overflowing. Although the lower end of the overflow channel 203 is lower than the hole 101, theoretically a siphon phenomenon can be formed, but from the drawings, the overflow channel 203 is equivalent to an inverted U-shape, including an upward section, a downward section and a horizontal section connecting the upward section and the downward section. Although this structure may also be able to form a siphon effect, because the connection points of the various sections of the overflow channel are all 90° turns from the drawings, it is more difficult to form a siphon effect in actual operation, resulting in the overflow water not being able to flow out smoothly from the inner tank; in addition, it can be seen from the figure that the width of the adjacent parts of the overflow channel 203 and the hole 101 is the same everywhere, which is not conducive to the rapid outflow of overflow water. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a flow channel structure for a cleaning machine that can quickly flow out water by forming a siphon effect in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a flow channel structure for a cleaning machine with a single hole and multiple uses, in view of the current status of the prior art.

[0007] The third technical problem to be solved by the present invention is to provide a cleaning machine using the above-mentioned flow channel structure in view of the current status of the prior art.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a flow channel structure for a cleaning machine, comprising:

[0009] A shell, wherein a first through hole and a drain port are formed on the shell, and a water flow channel connecting the first through hole and the drain port is formed inside the shell, wherein the height of the drain port is lower than that of the first through hole, and along the water flow direction, the first through hole is located upstream of the drain port;

[0010] It is characterized in that: the water flow channel includes

[0011] An ascending section extends upward from the first through hole, and a lower end of the ascending section is fluidically connected to the first through hole;

[0012] The descending section extends downward from the upper end of the ascending section to be fluidly connected with the drain outlet, and the descending section is fluidly connected with the ascending section.

[0013] The structure is simple, and the longitudinal section of the water flow channel is in an inverted V shape. The water flow channel has a simple structure and is easy to form a siphon phenomenon, so that water flows out quickly from the first through hole.

[0014] In order to further make the water flow smoothly from the first through hole to the drain outlet, the lower end of the upward section is a contraction section that gradually contracts along the water flow direction. In this way, the width of the water flow channel adjacent to the first through hole is larger, which can make the water flow smoothly into the water flow channel, and then flow to the drain outlet continuously under the siphon effect.

[0015] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: an air port for air flow is also opened on the shell, and an air flow channel connecting the air port and the first through hole is provided inside the shell, and along the air flow direction, the air port is located upstream or downstream of the first through hole.

[0016] In the above solution, along the air flow direction, the first through hole is located upstream of the air outlet. In this way, the first through hole can not only serve as a water outlet (such as a drain outlet, an overflow outlet), but also as an exhaust outlet. When the flow channel structure is applied to a cleaning machine, if the air pressure inside the inner tank of the cleaning machine is relatively high, the hot and humid air will be discharged from the first through hole to balance the air pressure inside and outside the inner tank.

[0017] In order to speed up the discharge of gas, a fan is provided in the air flow channel, the air inlet of the fan is fluidly connected to the first through hole, and the air outlet of the fan is fluidly connected to the air outlet. The fan can suck gas out from the first through hole and discharge it to the exhaust port.

[0018] In order to further improve the function of the first through hole, a water inlet is also provided on the shell, and a water inlet channel is provided inside the shell to connect the water inlet and the first through hole, and along the water flow direction, the first through hole is located downstream of the water inlet. It can be seen that the first through hole can also be used as a water inlet. When used in a washing machine, the first through hole can supply water to flow into the inner pot to wash fruits, vegetables and tableware.

[0019] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is: a cleaning machine, characterized in that: it includes an inner tank and the above-mentioned flow channel structure, the shell is installed on the outer wall of the inner tank, the inner tank has a washing chamber, the inner tank is provided with a second through hole fluidically connected to the washing chamber, the first through hole is opened on the side wall of the shell close to the inner tank, the first through hole and the second through hole are arranged correspondingly and the two are fluidically connected.

[0020] In order to facilitate the connection between the inner liner and the shell, the shell and the inner liner are connected by a connecting piece, and the connecting piece includes a connecting sleeve that can pass through the first through hole and the second through hole, and the connecting sleeve is provided with a connecting port that passes through the axial direction thereof, one end of the connecting sleeve passes through the second through hole and is threadedly connected to the first through hole, and the other end of the connecting sleeve is formed with a pressing portion that extends toward the inner liner to press the inner liner against the shell.

[0021] In order to input water into the inner pot to wash the dishes, fruits and vegetables in the inner pot, the shell is also provided with a water inlet, and the shell has a water inlet channel connecting the water inlet and the first through hole, and along the water flow direction, the first through hole is located downstream of the water inlet. In this way, water can be input into the inner pot from the first through hole, and the first through hole also serves as a water inlet hole, so that one hole has multiple uses.

[0022] Preferably, the water inlet channel includes a first upwardly extending upward channel, a first downwardly extending downwardly extending channel, a second upwardly extending upwardly extending channel, and a second downwardly extending downwardly extending channel, which are fluidly connected in sequence, the lower end of the first upward channel is fluidly connected to the water inlet, the upper end of the first upward channel is fluidly connected to the upper end of the first downward channel, the lower end of the first downward channel is fluidly connected to the lower end of the second upward channel, the upper end of the second upward channel is fluidly connected to the upper end of the second downward channel, and the lower end of the second downward channel is fluidly connected to the first through hole. In this way, the path of the water inlet channel is circuitously arranged, and the overall path is relatively long, which can make full use of the residual heat in the inner tank during the washing process to heat the water in the water inlet channel.

[0023] In daily life, insoluble sediments (such as scale) are easily generated in the water used. In the application of dishwashers, if the hardness of water is high, on the one hand, scale will form on the surface of the heating device in the dishwasher, which will seriously hinder the heat conduction and cause perforation corrosion, resulting in damage to the heating element; on the other hand, it will make the surface of the dishwasher and the dishes after washing not clean, affecting the washing quality of the dishwasher. Therefore, a water softener is installed on the washing machine. Its working principle is to use the genes in the ion exchange resin to soften the hardness components in the water, such as Ca 2+ Mg 2+ Plasma replacement removal is used to achieve the purpose of softening hard water, thereby reducing the scale generated inside the dishwasher and the harm it brings, and effectively extending the service life of the dishwasher. In the above process, when the exchange ions on the resin are all converted into calcium and magnesium, the conversion effect of the resin is saturated, and the conversion capacity will fail. At this time, the resin needs to be regenerated, and the calcium and magnesium ions need to be replaced with sodium ions. In this regeneration process, salt water flows through the resin cavity and reacts with the resin in the resin cavity, allowing sodium ions to replace calcium and magnesium ions, thereby restoring the water softening ability of the resin. The water inlet is arranged at the bottom of the shell, and the cleaning machine also includes a water softener arranged below the inner tank, the lower end of the first descending channel is fluidly connected to the water inlet hole of the water softener, and the water outlet hole of the water softener is fluidly connected to the lower end of the second ascending channel.

[0024] Compared with the prior art, the advantages of the present invention are as follows: 1. The height of the drain outlet of the present invention is lower than the height of the first through hole, and along the water flow direction, the first through hole is located upstream of the drain outlet. The present invention designs the water flow channel into an upward section and a downward section, and the upper end of the upward section is higher than the first through hole, so that theoretically a siphon phenomenon will be formed. Furthermore, the upward section and the downward section of the present invention have an angle between them, so that compared with the method in which the upward section and the downward section are arranged in parallel and connected by a transverse section, the water flow channel of the present invention is easier to form a siphon phenomenon, thereby making the water flow continuous. 1. The first through hole of the present invention can be used not only as a water hole (overflow or drain), but also as an air hole (exhaust hole or air inlet hole), so that one hole can be used for multiple purposes, and there is no need to open a large number of holes on the shell; when used in a cleaning machine, there is no need to open a plurality of holes on the side wall of the inner tank of the cleaning machine, which reduces the damage to the inner tank and reduces the hidden danger of liquid leakage or air leakage caused by poor sealing of the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a cleaning machine according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0027] Figure 3 for Figure 1 The exploded diagram of the other direction;

[0028] Figure 4 for Figure 1 A cross-sectional view of

[0029] Figure 5 for Figure 4 The enlarged view of point B;

[0030] Figure 6 for Figure 1 A schematic diagram of the structure without the second shell;

[0031] Figure 7 for Figure 6 Enlarged view of point C;

[0032] Figure 8 for Figure 7 Schematic diagram of water flow in the water inlet channel;

[0033] Fig. 9 for Figure 7 Schematic diagram of water flow in the air flow channel and the water flow channel;

[0034] Fig.10 for Figure 1 A schematic diagram of the structure of the flow channel structure without the second shell. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 4 As shown, the cleaning machine of this preferred embodiment includes an inner tank 1 and a flow channel structure A. The inner tank 1 has a washing chamber 11 therein. The inner tank 1 is provided with a second through hole 12 which is fluidically connected to the washing chamber 11 .

[0037] The flow channel structure A includes a shell 2, a first through hole 21 is opened on the side wall of the shell 2 close to the inner liner 1, the shell 2 is installed on the outer wall of the inner liner 1, the first through hole 21 and the second through hole 12 are arranged correspondingly and the two are fluidically connected.

[0038] like Figure 5 As shown, the shell 2 and the liner 1 are connected by a connecting piece 3, and the connecting piece 3 includes a connecting sleeve 31 that can pass through the first through hole 21 and the second through hole 12. A connecting port 32 is provided on the connecting sleeve 31 and passes through the axial direction thereof. One end of the connecting sleeve 31 passes through the second through hole 12 and is threadedly connected to the first through hole 21. The other end of the connecting sleeve 31 is formed with a pressing portion 33 that extends toward the liner 1 to press the liner 1 against the shell 2. A gasket 34 can be arranged between the pressing portion 33 and the liner 1 to ensure that the two are tightly connected to avoid leakage of liquid or air.

[0039] The inner liner 1 and the shell 2 are connected to each other by fluid (water flow, air flow) through the connecting port 32. Of course, the connecting member 3 can also be other structural forms, and the inner liner 1 and the shell 2 are directly connected to each other by fluid through the first through hole 21 and the second through hole 12.

[0040] The first through hole 21 in this embodiment can be used as an overflow hole, a water inlet hole and an air vent. Of course, the first through hole 21 is not limited to the method shown in this embodiment, and can also be used as a drainage hole and an air inlet hole at the same time.

[0041] like Figure 6 , 7As shown in Figures 10 and 11, a drain port 22 is also provided on the housing 2. A water flow channel 23 is provided inside the housing 2, which is connected to the first through hole 21 and the drain port 22. The height of the drain port 22 is lower than that of the first through hole 21, and along the water flow direction, the first through hole 21 is located upstream of the drain port 22. In this embodiment, the longitudinal section of the water flow channel 23 is in an inverted V shape. The water flow channel 23 includes an upward section 231 and a downward section 232. The upward section 231 extends upward from the first through hole 21, and the lower end of the upward section 231 is in fluid communication with the first through hole 21. The downward section 232 extends downward from the upper end of the upward section 231 to be in fluid communication with the drain port 22. The downward section 232 is in fluid communication with the upward section 231 and there is an angle between the two, which can be an acute angle or an obtuse angle.

[0042] When the water level in the inner tank 1 continues to rise and is higher than the first through hole 21, the first through hole 21 acts as an overflow hole. Because the height of the drain port 22 is lower than the height of the first through hole 21, and the first through hole 21 is lower than the upper end of the upward section 231, a siphon phenomenon can be formed, so that the water in the inner tank 1 flows continuously through the first through hole 21 to the drain port 22, and the drain port 22 is connected to the sewer pipe. The water flow path is as follows: Fig. 9 In addition, the lower end of the upward section 231 is a contraction section 2311 that gradually contracts along the water flow direction. In this way, the width of the water flow channel 23 adjacent to the first through hole 21 is relatively large, which enables water to flow smoothly into the water flow channel 23, and then flow to the drain port 22 continuously under the siphon effect.

[0043] Of course, the first through hole 21 can also be used as a sewage outlet for draining sewage in the inner tank 1.

[0044] like Figure 6 , 7 As shown in Figures 10 and 11, the shell 2 is also provided with an air port 24 for air to pass through, and the shell 2 has an air flow channel 25 connecting the air port 24 and the first through hole 21, and along the air flow direction, the air port 24 is located downstream of the first through hole 21, and the first through hole 21 serves as an exhaust hole. A fan 4 is provided in the air flow channel 25, and the air inlet of the fan 4 is fluidly connected to the first through hole 21, and the air outlet of the fan 4 is fluidly connected to the exhaust port. If the temperature in the inner tank 1 of the cleaning machine is high (such as during the drying process), the internal air pressure increases, and the hot and humid air will be discharged from the first through hole 21 to balance the air pressure inside and outside the inner tank 1. In addition, because the temperature inside the inner tank 1 is high during the drying process, hot air is blown inside the inner tank 1 for convection drying, and the temperature between the inner tank 1 and the outer shell surrounding the outer side of the inner tank 1 is low, condensed water will be formed, which needs to be exhausted in time through the fan 4. The flow path of the air flow is as follows: Fig. 9 As shown by the solid arrow in FIG. 4 , the fan 4 can adopt the existing fan structure.

[0045] In this embodiment, the side wall of the housing 2 is provided with an exhaust hole 26 connecting the first through hole 21 with the outside atmosphere to accelerate the exhaust of gas. When the temperature inside the liner 1 is high, the air pressure inside the liner 1 increases, and the first through hole 21 is connected to the atmosphere to balance the air pressure.

[0046] Of course, the first through hole 21 can also be used as an air inlet. In this case, the air outlet 24 is located upstream of the first through hole 21. A heating element, such as a PTC resistance heating element, can also be provided in the air flow channel 25 to blow hot air into the inner pot 1 to speed up the drying of the tableware.

[0047] like Figure 6 , 7 As shown in Figures 10 and 11, a water inlet 27 is also provided on the housing 2, and a water inlet channel 28 is provided inside the housing 2 to connect the water inlet 27 and the first through hole 21, and along the water flow direction, the first through hole 21 is located downstream of the water inlet 27. It can be seen that the first through hole 21 can also be used as a water inlet hole. When used in a cleaning machine, the first through hole 21 can supply water to flow into the inner pot 1 to wash fruits, vegetables and tableware.

[0048] In daily life, insoluble sediments such as scale are easily generated in the water used. In the application of dishwashers, if the hardness of water is high, on the one hand, scale will form on the surface of the heating device in the dishwasher, which will seriously hinder the heat conduction and cause perforation corrosion, resulting in damage to the heating element; on the other hand, it will make the surface of the dishwasher and the dishes after washing not clean, affecting the washing quality of the dishwasher. Therefore, a water softener is installed on the washing machine. The working principle of the water softener is to use the groups in the ion exchange resin to convert the hardness components in the water, such as Ca 2+ Mg 2+ Plasma replacement removal is used to soften hard water, thereby reducing the scale inside the dishwasher and the harm it brings, effectively extending the service life of the dishwasher. In the above process, when the exchange ions on the resin are all converted into calcium and magnesium, the conversion effect of the resin is saturated and the conversion capacity will be invalid. At this time, the resin needs to be regenerated and the calcium and magnesium ions need to be replaced with sodium ions. During this regeneration process, salt water flows through the resin cavity and reacts with the resin in the resin cavity, allowing sodium ions to replace calcium and magnesium ions, thereby restoring the resin's water softening ability.

[0049] Therefore, the cleaning machine of this embodiment further includes a water softener 6 arranged below the inner tank 1, a water inlet 27 is arranged at the bottom of the housing 2, and the municipal water is connected to the water inlet 27 through the water inlet pipe 271. The water inlet channel 28 includes a first upward channel 281 extending upward, a first downward channel 282 extending downward, a second upward channel 283 extending upward, and a second downward channel 284 extending downward, which are fluidly connected in sequence. The lower end of the first upward channel 281 is fluidly connected to the water inlet 27, and the upper end of the first upward channel 281 is fluidly connected to the first downward channel 284. 2, the lower end of the first descending channel 282 is in fluid communication with the water inlet of the water softener 6, the water outlet of the water softener 6 (the outlet is in fluid communication with the resin chamber of the water softener, and water flows out from the outlet after softening) is in fluid communication with the lower end of the second ascending channel 283, so that the lower end of the first descending channel 282 is in fluid communication with the lower end of the second ascending channel 283, the upper end of the second ascending channel 283 is in fluid communication with the upper end of the second descending channel 284, and the lower end of the second descending channel 284 is in fluid communication with the first through hole 21. A water flow meter 5 is provided in the first ascending channel 281 to detect the water flow.

[0050] Water flow path Figure 8 As shown by the arrow in Figure 8 As can be seen in the figure, the water flows sequentially through the water inlet pipe 271, the water inlet 27, the first upward channel 281, the first downward channel 282, the water softener 6, the second upward channel 283, the second downward channel 284 and finally enters the first through hole 21. In this way, the path of the water inlet channel 28 is circuitously arranged, and the overall path is relatively long, so that the residual heat in the inner tank 1 during the washing process of the inner tank 1 can be fully utilized to heat the water in the water inlet channel 28.

[0051] The structure of the water softener 6 will not be described in detail here. The structure of the existing water softener 6 can be adopted, such as the "A Water Softener 6 and a Dishwasher" disclosed in the Chinese Utility Model Patent No. CN202022097007.3 (Announcement No. CN214017448U).

[0052] In order to facilitate the arrangement of a water flow channel 23, an air flow channel 25, etc. in the shell 2, the shell 2 of this embodiment includes a first shell 201 and a second shell 202, and the first through hole 21 is arranged on the first shell 201. The first shell 201 and the second shell 202 may be provided with the same flow channel structure, and the two may be welded together to form the aforementioned channel; or the flow channel may be arranged on one of the first shell 201 and the second shell 202, and the other cover of the first shell 201 and the second shell 202 may be arranged on the other to close the groove of the flow channel to form a channel.

[0053] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts, which are collectively referred to as the first part and the second part respectively below, that is, fluid gas, liquid or a mixture of the two can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A flow channel structure for a cleaning machine, comprising: A shell (2), wherein a first through hole (21) and a drain outlet (22) are formed on the shell (2), and a water flow channel (23) is provided inside the shell (2) and is connected to the first through hole (21) and the drain outlet (22), wherein the height of the drain outlet (22) is lower than the height of the first through hole (21), and along the water flow direction, the first through hole (21) is located upstream of the drain outlet (22); It is characterized in that: the water flow channel (23) includes An upward section (231) extends upward from the first through hole (21), and a lower end of the upward section (231) is in fluid communication with the first through hole (21); A descending section (232) extends downward from the upper end of the ascending section (231) to be in fluid communication with the drain outlet (22), wherein the descending section (232) is in fluid communication with the ascending section (231); The longitudinal section of the water flow channel (23) is in an inverted V shape; The lower end of the upward section (231) is a contraction section (2311) that gradually contracts along the water flow direction; The shell (2) is also provided with an air port (24) for air to pass through, and the shell (2) has an air flow channel (25) inside that connects the air port (24) and the first through hole (21), and along the air flow direction, the air port (24) is located upstream or downstream of the first through hole (21).

2. The flow channel structure according to claim 1, characterized in that: Along the airflow direction, the first through hole (21) is located upstream of the air outlet (24), and a fan (4) is provided in the airflow channel (25). The air inlet of the fan (4) is fluidically connected to the first through hole (21), and the air outlet of the fan (4) is fluidically connected to the air outlet (24).

3. The flow channel structure according to any one of claims 1 to 2, characterized in that: The shell (2) is also provided with a water inlet (27), and the shell (2) has a water inlet channel (28) inside that communicates with the water inlet (27) and the first through hole (21), and along the direction of water flow, the first through hole (21) is located downstream of the water inlet (27).

4. A cleaning machine, characterized in that: The invention comprises an inner liner (1) and a flow channel structure as described in any one of claims 1 to 3, wherein the shell (2) is installed on the outer wall of the inner liner (1), the inner liner (1) has a washing chamber (11), the inner liner (1) is provided with a second through hole (12) which is fluidically connected to the washing chamber (11), the first through hole (21) is provided on the side wall of the shell (2) close to the inner liner (1), the first through hole (21) and the second through hole (12) are arranged correspondingly and the two are fluidically connected.

5. The cleaning machine according to claim 4, characterized in that: The shell (2) and the inner container (1) are connected via a connecting piece (3); the connecting piece (3) comprises a connecting sleeve (31) capable of passing through the first through hole (21) and the second through hole (12); the connecting sleeve (31) is provided with a connecting opening (32) extending through the first through hole (21) and the second through hole (12); one end of the connecting sleeve (31) passes through the second through hole (12) and is threadedly connected to the first through hole (21); the other end of the connecting sleeve (31) is formed with a pressing portion extending toward the inner container (1) so as to press the inner container (1) against the shell (2).

6. The cleaning machine according to claim 4, characterized in that: The shell (2) is also provided with a water inlet (27), and the shell (2) has a water inlet channel (28) inside that communicates with the water inlet (27) and the first through hole (21), and along the direction of water flow, the first through hole (21) is located downstream of the water inlet (27).

7. The cleaning machine according to claim 6, characterized in that: The water inlet channel (28) comprises a first upward channel (281) extending upward, a first downward channel (282) extending downward, a second upward channel (283) extending upward, and a second downward channel (284) extending downward, wherein the lower end of the first upward channel (281) is fluidically connected to the water inlet (27), the upper end of the first upward channel (281) is fluidically connected to the upper end of the first downward channel (282), the lower end of the first downward channel (282) is fluidically connected to the lower end of the second upward channel (283), the upper end of the second upward channel (283) is fluidically connected to the upper end of the second downward channel (284), and the lower end of the second downward channel (284) is fluidically connected to the first through hole (21).

8. The cleaning machine according to claim 7, characterized in that: The water inlet (27) is arranged at the bottom of the shell (2), and the cleaning machine also includes a water softener (6) arranged below the inner tank (1), the lower end of the first downward channel (282) is fluidically connected to the water inlet hole of the water softener (6), and the water outlet hole of the water softener (6) is fluidically connected to the lower end of the second upward channel (283).

Images