A wastewater tank, a cleaning plant and a cleaning station

Abstract

A wastewater tank (100) characterized in that it comprises: a wastewater chamber (110) having an opening (111) at the top of the wastewater chamber (110); a tank lid (120) that is removable and closes the opening (111); a water inlet channel (130) arranged on the tank lid (120) and having a water outlet (132) and a water inlet (131) that can be connected to a clear water supply line; a self-cleaning device (140) arranged on the tank lid (120) and located inside the wastewater chamber (110), wherein the self-cleaning device (140) comprises a supply inlet (141) and a spray outlet (142), the supply inlet (141) being connected to the water outlet (132); wherein the jet of clear water exiting the spray outlet (142) generates a recoil that cleans the self-cleaning device (140) drives it to rotation.

Description

The present utility model application claims priority over Chinese patent applications 2025208633275, 2025208633383, 2025105706086 and 2025208627236, filed with the Chinese Patent Office on April 30, 2025, the entire disclosure content of which is incorporated into the present application by reference. Technical field The present disclosure belongs to the technical field of cleaning technology and relates in particular to a wastewater tank, a cleaning plant and a cleaning station. Background technology With the rapid development of technology and the continuous improvement of living standards, more and more households are beginning to use smart home appliances. Cleaning systems (such as robotic vacuum cleaners and floor mops) are increasingly being used because they can replace human labor in tasks such as sweeping, vacuuming, and mopping, thereby reducing the workload associated with floor cleaning and minimizing physical fatigue. A wastewater tank is an essential component of any cleaning system. During the cleaning process, real-time self-cleaning of the wet cleaning components (such as disc mops, roller mops, and tracked mops) is required. The wastewater generated during this self-cleaning process must be collected in a wastewater tank to prevent contamination of the surface being cleaned. Currently, most wastewater tanks in cleaning systems on the market require frequent manual cleaning by the user, which is extremely inconvenient. Users often have to use specialized tools (such as brushes) to ensure thorough cleaning. This not only results in a cumbersome cleaning process but also a significant time investment, negatively impacting the user experience. Content of the utility model In view of the problems existing in the prior art as mentioned above, the present disclosure provides a wastewater tank, a cleaning plant and a cleaning station to improve the technical difficulties of the impractical cleaning of conventional wastewater tanks. To achieve the aforementioned and other related purposes, the first aspect of this disclosure provides a wastewater tank, the wastewater tank comprising: a wastewater chamber, a tank lid, a water inlet channel, and a self-cleaning device; the top of the wastewater chamber having an opening; the tank lid being removable and closing the opening; the water inlet channel being arranged on the tank lid and having a water outlet and a water inlet that can be connected to a clean water supply line; the self-cleaning device being arranged on the tank lid and located inside the wastewater chamber, the self-cleaning device comprising a supply inlet and a spray outlet, the supply inlet being connected to the water outlet;the jet of clear water exiting the spray outlet generates a recoil that drives the self-cleaning device to rotate. The advantageous effects of this arrangement are as follows: In this embodiment, the arrangement of a self-cleaning device within the wastewater chamber, through its rotating movement, ensures that clean water is expelled from the spray outlet and the chamber wall is rinsed from various angles, thereby achieving comprehensive coverage of all areas of the chamber wall. This arrangement enables effective cleaning of residues on the chamber wall and facilitates automatic cleaning of the wastewater chamber. Since the entire cleaning process can be automated, cumbersome manual cleaning is avoided, significantly improving the ease of use when cleaning the wastewater tank.Simultaneously, this multi-angle spraying method can also improve the cleaning effect of the wastewater chamber and ensure that the chamber wall is thoroughly cleaned. Furthermore, the self-cleaning device utilizes the recoil of the water jet to drive rotation, eliminating the need for an additional drive motor or gearbox. This reduces both energy consumption and the number of components, and avoids the risk of failure that can arise from contact between electrical components and wastewater, thus improving the durability of the self-cleaning device. In one embodiment of the present disclosure, the self-cleaning device comprises a rotary arm, wherein the rotary arm is rotatably attached to the container lid, wherein the spray outlet is arranged on the rotary arm; wherein a flow channel is formed inside the rotary arm, wherein the flow channel connects the supply inlet to the spray outlet. The advantageous effect of this arrangement lies in the fact that by incorporating a flow channel inside the rotary arm, an integrated arrangement of the flow channel and spray outlet can be achieved. This not only ensures the continuity and stability of the water supply to the spray outlet, but also increases the compactness of the rotary arm's structure, reduces the interior space occupied by the wastewater chamber, and safeguards the wastewater volume of the wastewater chamber. In one embodiment of the present disclosure, the rotary arm comprises a pivot axis and a rod body, wherein one end of the pivot axis is rotatably connected to the container lid and the other end is connected to the rod body, wherein the spray outlet is arranged on the rod body. The advantageous effect of this arrangement is that connecting one end of the rotating axis to the container lid and the other end to the rod body results in a more compact overall design for the rotary arm. This allows it to better adapt to the limited interior space of the container lid and avoids excessive use of the installation space. Simultaneously, by positioning the spray outlet on the rod body and adjusting its position along the rod body, the spray path during the rod's rotation can be regulated, thus achieving better coverage of the various areas of the wastewater chamber wall and consequently improving cleaning efficiency.Furthermore, adjusting the number and size of the spray outlets allows for changes in both the flow rate and pressure of the sprayed water, thereby regulating the rotational speed of the rod body and the spray pressure of the outlets. This design enables the self-cleaning device to better adapt to the cleaning requirements of wastewater chambers of varying shapes and sizes, thus increasing its adaptability and flexibility. In one embodiment of the present disclosure, the flow channel comprises a first channel and a second channel connected to each other. The first channel extends in the axial direction of the axis of rotation, with the upper part of the first channel penetrating the axis of rotation and the lower part of the first channel being connected to one end of the second channel. The other end of the second channel extends in the longitudinal direction of the rod body, and the spray outlet is arranged on the side wall of the second channel. The advantageous effect of this arrangement lies in the fact that the first channel runs along the axial direction of the axis of rotation, while the second channel runs along the longitudinal direction of the rod body. This not only facilitates the form-fitting design of the first and second channels but also reduces the number of bends in the flow channel, thereby decreasing pressure loss when the clear water flows through it. Simultaneously, the spray outlet is located on the side wall of the second channel, allowing it to be positioned closer to the wall of the wastewater chamber. This shortens the spray distance, intensifies the impact of the water jet, and thus improves the cleaning effect on the chamber wall. In one embodiment of the present disclosure, the container lid comprises a receiving chamber, wherein a pivot axis is rotatably arranged in the receiving chamber. The rod body extends outwards from the receiving chamber. The water outlet is arranged on the ceiling wall of the receiving chamber, while the supply inlet is attached to the pivot axis and is vertically connected to the water outlet. The advantage of this arrangement lies in the fact that mounting the pivot axis within the receiving chamber and extending the rod body beyond it allows for a more compact design of the entire self-cleaning unit in the vertical direction of the wastewater chamber. This design enables optimal use of the wastewater tank's interior space and avoids unnecessary waste. Since the pivot axis is mounted within the receiving chamber, the chamber provides more stable support for the axis. This reduces swaying and vibrations during the rotation of the rotating arm and improves the stability of the self-cleaning unit's operation.Furthermore, by positioning the water outlet on the ceiling wall of the receiving chamber and the supply inlet on the axis of rotation, and connecting them vertically, a direct flow transfer between the water outlet and supply inlet can be achieved during the rotation of the axis, without requiring additional complex swivel joints. Therefore, the structural design can be simplified and manufacturing and assembly costs reduced. In one embodiment of the present disclosure, the axis of rotation and the rod body are snap-fit ​​connected by a clamping structure. The clamping structure comprises a clamping block and a clamping groove, wherein the clamping block and the clamping groove snap correspondingly to each other, the clamping block and the clamping groove being arranged on the axis of rotation and on the rod body, respectively. The advantageous effect of this arrangement lies in the fact that the use of a clamping structure connects the rotary axis to the rod body, allowing for quick separation of the rotary axis from the rod body and thus achieving a modular design. In the event of a blockage of the spray outlet, the rod body can be directly disassembled and cleaned, thereby avoiding the complex process of completely disassembling the rotary axis in conventional designs and significantly reducing maintenance complexity. Simultaneously, the use of a clamping structure consisting of a clamping block and clamping groove secures the rotary axis to the rod body.This not only allows for easy disassembly and assembly between the axis of rotation and the rod body, as well as increased stability and reliability of the connection between the rod body and the axis of rotation, but the simple structure of the clamping block and clamping groove also facilitates manufacturing, which contributes to reducing production costs. In one embodiment of the present disclosure, the axis of rotation is rotatably mounted on the container lid by means of a bearing; wherein a receiving chamber is arranged on the container lid, the receiving chamber comprising a blind hole section and a stepped section, the stepped section being arranged near the opening of the receiving chamber compared to the blind hole section; wherein the axis of rotation comprises a flange part and a column body part, the column body part connecting the flange part to the rod body, the bearing being fitted to the column body part, the flange part being located in the blind hole section; wherein the bearing is mounted in the stepped section and forms a support for the end of the flange part facing the stepped section. The advantageous effect of this arrangement is that the bearing provides effective axial support for the flange section. This axial support function prevents axial play in the rotary axis, thus ensuring its positional accuracy and stability. Simultaneously, due to the mounting of the rotary axis's flange section in the blind hole and the fit of the column body section with the bearing in the stepped section, this segmented structure and fit arrangement is designed so that the individual components interact closely. This allows for optimal use of the available installation height, reducing the installation volume of the self-cleaning device and thus promoting a more compact overall design. In one embodiment of the present disclosure, a sealing cap is attached to the opening of the receiving chamber, the sealing cap supporting an end of the bearing that is facing away from the blind hole section and sealing the mounting gap between the bearing and the step section. The advantageous effect of this arrangement is that a sealing cap is fitted to the opening of the receiving chamber. This cap seals the mounting gap between the bearing and the chamber, reducing the risk of clear water escaping from the supply inlet through the bearing's mounting gap. This ensures a stable spray volume at the spray outlet. Simultaneously, the sealing cap prevents wastewater and dust from the wastewater chamber from entering the area between the bearing and the receiving chamber, thus reducing bearing wear and ensuring proper bearing operation.Furthermore, the sealing cap at the end of the bearing facing away from the blind hole section provides support, thereby not only improving the axial positioning accuracy of the bearing and reducing the risk of bearing failure, but also transferring the axial force of the bearing via the sealing cap to the main structure of the receiving chamber. This further increases the axial stability of the bearing and reduces axial deformation and wear. In one embodiment of the present disclosure, the spray outlet is arranged at at least one end of the longitudinal direction of the rod body, and the spray direction of the spray outlet forms an angle to the longitudinal direction of the rod body. The advantageous effect of this arrangement is that the spray outlet is located at at least one end along the length of the rod body, and the spray direction of the outlet forms an angle with the length of the rod body. This design not only allows the recoil force of the water jet to be used for self-propelled rotation of the rod body, but can also generate a complex water flow with axial and radial components along the rod body. This overcomes the limitations of conventional direct jet methods by extending the water jet area from the axial direction of the rod body to its circumference, thus enabling comprehensive cleaning of the wastewater chamber wall. In one embodiment of the present disclosure, two spray outlets are provided, wherein the two spray outlets are arranged at the two ends of the rod body in the longitudinal direction, wherein the spray directions of the two spray outlets are opposite. The advantageous effect of this arrangement is that the recoil forces of the two opposing spray outlets on the rod body balance each other. This gives the rod body a more stable and uniform torque, preventing vibrations or deviations due to uneven loading. Simultaneously, the design of a double-sided back spray allows the water jet to act on both sides of the rod body along its length at the same time, enabling synchronous cleaning of the areas on both sides of the wastewater chamber, which in turn increases cleaning efficiency. In one embodiment of the present disclosure, at least two self-cleaning devices are arranged on the container lid, wherein the water inlet channel is provided with at least two water outlets, with each self-cleaning device having one water outlet assigned to it. The advantageous effect of this arrangement is that the use of at least two self-cleaning units, each assigned to a water outlet, ensures more comprehensive coverage and cleaning of the wastewater chamber. Compared to a single self-cleaning unit, a system with at least two allows for the simultaneous cleaning of different areas of the wastewater chamber wall, thereby increasing cleaning efficiency and reducing cleaning time. In one embodiment of the present disclosure, the container lid comprises a lid body and a cover plate. The lid body is provided with a groove, and the cover plate abuts the groove, such that the groove and the cover plate together define at least a portion of the water inlet channel. The advantageous effect of this arrangement lies in the fact that the combination of groove and cover plate forms a water inlet channel, which allows for simpler machining compared to a one-piece, closed tubular channel integrated into the lid body. Furthermore, the groove can be formed directly onto the lid body using various methods such as injection molding or stamping, eliminating the need for complex chamber tools or additional pipe assemblies. This reduces the production costs of the water inlet line and increases production efficiency. At the same time, if the water inlet channel becomes clogged, the debris in the groove can be removed directly by simply opening the cover plate, without having to disassemble the entire container lid or use special cleaning tools.This open structure facilitates inspection and maintenance, allows for quick restoration of the water inlet channel's continuity, and improves the maintainability and long-term reliability of the water inlet channel. In one embodiment of the present disclosure, a clear water inlet is arranged on the side wall of the wastewater chamber, wherein the clear water inlet is connected to the water inlet, and wherein a drain opening is provided on the bottom wall of the wastewater chamber. The advantageous effect of this arrangement is that, by placing a clear water inlet on the side wall of the wastewater chamber and a drain opening on the bottom wall, the clear water inlet can be positioned close to the chamber's opening. This allows the clear water inlet to be located away from the bottom wall within the wastewater chamber, preventing wastewater from entering the inlet, thus avoiding contamination of the clear water and ensuring its purity. Furthermore, due to gravity, the wastewater and impurities generated after cleaning the chamber walls settle at the bottom of the chamber.Therefore, the arrangement of a drain opening on the bottom wall of the wastewater chamber can effectively drain the wastewater and deposits, reduce the long-term accumulation of wastewater and dirt on the bottom of the wastewater chamber, and improve the cleaning efficiency of the wastewater tank. In one embodiment of the present disclosure, the container lid is rotatably connected to the wastewater chamber and can be switched between a first position in which the opening is covered and a second position in which the opening is open; wherein a water inlet pipe is further arranged in the wastewater chamber, the water inlet pipe connecting the clear water inlet to the water inlet. The advantageous aspect of this arrangement is that the tank lid is attached to the wastewater chamber via a swivel joint. This design allows operators to quickly open the tank lid for maintenance, cleaning, or inspections without the need for a complex disassembly and reassembly process. For example, when removing deposits from the wastewater chamber or inspecting internal components, the tank lid can simply be rotated to the second position, significantly increasing operational efficiency. A water inlet pipe is installed in the wastewater chamber, simplifying and speeding up the connection between the clean water inlet and the water inlet. During assembly, only the two ends of the water inlet pipes need to be connected to the clean water inlet and the water inlet, respectively, ensuring simple and straightforward handling. In one embodiment of the present disclosure, a valve assembly is arranged at the drain opening, wherein the valve assembly opens the drain opening in response to the docking of the wastewater tank to the cleaning station. The advantageous effect of this arrangement is that the valve assembly automatically reacts to the docking of the wastewater tank to the cleaning station, thus enabling the automatic opening of the drain, eliminating the need for manual intervention. This not only effectively increases the efficiency of opening the drain but also reduces errors caused by improper manual operation, such as forgetting to open or close the drain. Therefore, problems such as wastewater leaks or equipment damage caused by operator error can be avoided. In one embodiment of the present disclosure, the valve assembly comprises a stop plate and a plunger, wherein the stop plate is rotatably connected to the chamber wall of the wastewater chamber, and wherein the plunger is arranged to slide in the wastewater chamber; wherein, in response to the docking of the wastewater tank to the cleaning station, the plunger is driven by the plunger mechanism of the cleaning station and slides to rotate the stop plate and open the drain opening. The advantageous effect of this arrangement is that the automatic actuation of the plunger mechanism at the cleaning station causes the plunger to slide, thereby rotating the stop plate to open the drain opening, thus eliminating the need for manual intervention throughout the entire process. This automated design can improve ease of use when opening the drain opening and reduce manual intervention, especially in situations where the drain opening needs to be opened frequently, thereby effectively increasing work efficiency. In one embodiment of the present disclosure, the valve assembly further comprises an elastic return element which, in response to the separation of the wastewater tank from the cleaning station, causes the elastic return element to rotate the stop plate in the opposite direction to close the drain opening. The advantageous effect of this arrangement is that the elastic return element enables automatic closure of the drain opening. In response to the separation of the wastewater tank from the cleaning station, the elastic return element causes the stop plate to rotate in the opposite direction to close the drain opening, with the entire process occurring without manual intervention. Therefore, this design improves the efficiency of drain closing while simultaneously increasing the user-friendliness of the closing process. In the second aspect of the disclosure, a cleaning plant is provided, wherein the cleaning plant comprises a wastewater tank according to one of the above-mentioned embodiments. In one embodiment of the present disclosure, the cleaning system further comprises a clear water supply line, wherein the clear water supply line fluidically connects the water inlet and the overflow opening of the clear water tank, wherein the clear water tank is arranged at the cleaning system or the cleaning station. The advantageous effect of this arrangement is that, through the fluidic connection of the water inlet with the overflow opening of the clear water tank, when the water level in the clear water tank exceeds the set height, excess clear water automatically flows out through the overflow opening and is automatically transported back to the water inlet via the clear water supply line, thus providing the clear water supply for the self-cleaning unit within the wastewater chamber. Therefore, it is not necessary to provide a separate water pump for the self-cleaning unit, as the entire water supply process for the self-cleaning unit and the filling process of the clear water tank can utilize a single water pump. This arrangement not only simplifies the system design but also reduces manufacturing costs.At the same time, this design utilizes the natural overflow principle of the clear water tank for water supply, thus eliminating the need for additional energy consumption and achieving an energy-efficient and environmentally friendly effect. In the third aspect of the disclosure, a cleaning station is provided, wherein the cleaning station comprises a wastewater tank according to one of the above-mentioned embodiments. In one embodiment of the present disclosure, the cleaning station comprises a clear water supply line, wherein the clear water supply line fluidically connects the water inlet and the overflow opening of the clear water tank, wherein the clear water tank is arranged at the cleaning station or the cleaning system. Illustration of the attached figures Fig. 1 is a three-dimensional schematic structural view of a wastewater tank according to an embodiment of the present disclosure; Fig. 2 is a top view of the wastewater tank in the embodiment according to Fig. 1; Fig. 3 is a cross-sectional view in the direction AA in Fig. 2; Fig. 4 is a schematic structural view of a wastewater tank according to an embodiment of the present disclosure after removal of the tank lid; Fig. 5 is a schematic structural view of the tank lid of the wastewater tank according to an embodiment of the present disclosure; Fig. 6 is a three-dimensional structural view of the wastewater tank according to an embodiment of the present disclosure from another perspective; Fig. 7 is a cross-sectional view in the direction CC in Fig. 6; Fig. 8 is a partially enlarged view of the D area in Fig. 7; Fig.Fig. 9 is a cross-sectional view of the partial structure of the wastewater tank according to an embodiment of the present disclosure; Fig. 10 is a partially enlarged view of the E-area in Fig. 9; Fig. 11 is a three-dimensional schematic structural view of the tank lid of the wastewater tank according to an embodiment of the present disclosure in which no self-cleaning device is mounted; Fig. 12 is a projection view of the tank lid shown in Fig. 11 according to the embodiment from a different perspective; Fig. 13 is a cross-sectional view in the direction of FF in Fig. 12; Fig. 14 is a projection view of the tank lid of the wastewater tank according to an embodiment of the present disclosure in which a self-cleaning device is mounted; Fig. 15 is a partially enlarged view of the G-area in Fig. 14; Fig.Fig. 16 is a schematic structural view of the wastewater tank according to an embodiment of the present disclosure after removal of the cover plate of the tank lid; Fig. 17 is a partial cross-sectional view in the direction HH in Fig. 16; Fig. 18 is a schematic projection view of the tank lid of the wastewater tank according to an embodiment of the present disclosure from a different perspective; Fig. 19 is a partial cross-sectional view in the direction II in Fig. 18; Fig. 20 is a schematic structural view of the wastewater tank according to an embodiment of the present disclosure, wherein a drain opening is arranged at the bottom of the wastewater tank; Fig. 21 is a schematic structural view of the wastewater tank according to an embodiment of the present disclosure, wherein a water inlet pipe is arranged inside the wastewater chamber; Fig.Figure 22 is a schematic structural view of the wastewater tank according to an embodiment of the present disclosure, wherein the valve assembly closes the drain opening; Figure 23 is a schematic structural view of the wastewater tank according to an embodiment of the present disclosure, wherein the valve assembly opens the drain opening; Figure 24 is a schematic structural view of the wastewater tank when docked with the cleaning station according to an embodiment of the present disclosure; Figure 25 is a schematic representation of the mounting position of the wastewater tank and the clear water tank from one perspective according to an embodiment of the present disclosure; Figure 26 is a schematic representation of the mounting position of the wastewater tank and the clear water tank from another perspective according to an embodiment of the present disclosure; FigureFigure 27 is an exploded view of the wastewater tank and the clear water tank according to an embodiment of the present disclosure; Figure 28 is a schematic representation of the assembly position of the wastewater tank and the clear water tank from another perspective according to an embodiment of the present disclosure. Specific embodiments Specific examples illustrating the embodiments of this disclosure are presented below. Those skilled in the art in this field will readily recognize further advantages and effects of this disclosure based on the information provided in this description. With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27 to Fig. 28, this disclosure provides a wastewater tank 100, a cleaning system and a cleaning station, wherein the wastewater tank 100 is equipped with a self-cleaning device 140 in the wastewater chamber 110. The self-cleaning device 140 can rotate automatically using the recoil force generated when clear water is sprayed out, spraying the clear water onto the chamber wall of the wastewater chamber 110. This rinses away dirt adhering to the chamber wall of the wastewater chamber 110, enabling automatic cleaning of the wastewater chamber 110 and thus improving the ease of cleaning the wastewater tank 100. The present disclosure provides a cleaning system that can be used for, but is not limited to, floor cleaning machines, sweepers, cleaning robots, and the like. Using a cleaning robot as an example, the cleaning system comprises at least a machine body and a cleaning assembly, the cleaning assembly being attached to the machine body to perform cleaning operations on the surface to be cleaned. The cleaning assembly can be a disc mop, roller mop, tracked mop, etc. To improve the cleaning performance of the cleaning system, the cleaning assembly typically includes a wet cleaning function. In particular, the cleaning system is equipped with a 400-liter clear water tank and a 100-liter wastewater tank. The 400-liter clear water tank supplies clean water to the cleaning unit to ensure that the cleaning elements remain moist during the cleaning process, thus enabling wet cleaning of the surface. The 100-liter wastewater tank stores wastewater, which is generated by the cleaning unit during the wiping process and pumped into the 100-liter wastewater tank. Since wastewater tank 100 is used to store wastewater, and this wastewater contains a large amount of dust, dirt, and impurities after the tank is emptied, these contaminants adhere to the chamber wall of wastewater chamber 110 and are difficult to remove on their own. If the chamber wall is not cleaned regularly, these contaminants gradually accumulate, promoting bacterial growth and causing unpleasant odors, which impairs the hygienic performance and lifespan of the treatment system. Therefore, it is necessary to clean the chamber wall of wastewater chamber 110 regularly. In an embodiment of the present disclosure with reference to Figs. 1, 2 to 3, the wastewater tank 100 comprises a wastewater chamber 110, a tank lid 120, a water inlet channel 130, and a self-cleaning device 140. The wastewater tank 100 also comprises the tank body 117, the chamber of which forms the wastewater chamber 110. The wastewater chamber 110 can consist either of a single chamber structure or of several independent chambers, as long as the requirements for wastewater collection during the cleaning process are met. The shape of the wastewater chamber 110 can be cylindrical, rectangular, semi-cylindrical, or any other geometric shape.The upper part of the wastewater chamber 110 has an opening 111, the specific design of which includes, among other things, a local opening structure (such as a round or square opening formed in the upper part) or a complete opening structure (that is, the entire upper part serves as an opening). In this system, an upper opening with a complete opening structure is used. This arrangement allows for a larger area of ​​the opening 111 on the wastewater chamber 110, which facilitates the assembly and maintenance of the internal components of the wastewater tank 100. Referring to Figures 1, 4, and 5, the container lid 120 can be detachably placed onto the opening 111, meaning that the container lid 120 is connected to the container body 117 by means of a detachable connection. There are several possible implementations for a detachable connection. In one embodiment, a clamping groove can be provided on the container body 117 near the edge of the opening 111, while an elastic locking lug is provided at the corresponding position on the container lid 120. The fit between the clamping groove and the elastic locking lug ensures that the container lid 120 rests detachably against the opening 111. In another embodiment, the container lid 120 can also be connected to the container body 117 by releasable fasteners (such as screws, bolts, etc.), so that the container lid 120 rests detachably on the opening 111. Referring to Figures 4 and 5, a water inlet channel 130 is arranged on the container lid 120. The water inlet channel 130 has a water outlet 132 and a water inlet 131, the water inlet 131 being connectable to a clear water supply line. The water inlet channel 130 can be a separate piping structure that is firmly connected to the container lid 120 by means of fastening elements (such as pipe clamps or similar). Alternatively, the water inlet channel 130 can be manufactured directly by integrated injection molding or casting with the container lid 120, i.e., it forms a single unit with the container lid 120. Since the water inlet channel 130 is attached to the container lid 120, it can be removed and reinstalled by removing and reattaching the container lid 120. Referring to Figures 3, 5, 8, and 10, the self-cleaning device 140 is attached to the container lid 120 and is located inside the wastewater chamber 110. The self-cleaning device 140 comprises a supply inlet 141 and a spray outlet 142, the spray outlet 142 being connected to the supply inlet 141 and the supply inlet 141 being connected to the water outlet 132. The clear water exiting the clear water supply line enters the water inlet channel 130 via the water inlet 131, then flows through the water outlet 132 into the supply inlet 141, and is finally discharged from the spray outlet 142. The clear water jet exiting the spray outlet 142 generates a recoil that drives the self-cleaning device 140 to rotate relative to the wastewater chamber 110 in order to spray the clear water against the chamber wall of the wastewater chamber 110. The specific structure of the self-cleaning device 140 is not limited. In one embodiment, the self-cleaning device 140 can be rotatably connected to the container lid 120 at one end, while the other end has a transversely arranged rod-like structure with a spray nozzle attached to the end of the rod-like structure. When water is sprayed from the nozzles, a recoil force is generated at the end of the rod-like structure, which drives the rod-like structure to rotate, thus enabling a rotating spraying of the chamber wall of the wastewater chamber 110. In some further embodiments, the self-cleaning device 140 can be rotatably connected to the container lid 120 at one end, while the other end has a hollow cylindrical chamber structure. Several spray nozzles are attached to the circumferential chamber wall of the hollow cylindrical chamber.When water is sprayed through the spray nozzles, an opposing rotating thrust force is exerted on the circumferential chamber wall of the hollow cylindrical chamber, causing the hollow cylindrical chamber structure to rotate and thus achieving a rotating spraying of the chamber wall of the wastewater chamber 110. In this embodiment, the arrangement of a self-cleaning device 140 in the wastewater chamber 110, through its rotating movement, ensures that clear water is expelled from the spray outlet 142 and the chamber wall of the wastewater chamber 110 is rinsed from various angles, thus achieving comprehensive coverage of all areas of the chamber wall. This arrangement enables the effective removal of residues from the chamber wall of the wastewater chamber 110 and provides automatic cleaning of the wastewater chamber 110. Since the entire cleaning process can be automated, cumbersome manual cleaning is avoided, significantly improving the user-friendliness of cleaning the wastewater tank 100.At the same time, this multi-angle spraying method can also improve the cleaning effect of the wastewater chamber 110 and ensure that the chamber wall of the wastewater chamber 110 is thoroughly cleaned. Furthermore, the self-cleaning device 140 uses the recoil of the water jet to drive the rotation, thus eliminating the need for an additional drive motor or gearbox. This reduces both energy consumption and the number of components, and avoids the risk of failure that can arise from contact between electrical components and wastewater, thereby improving the durability of the self-cleaning device 140. In an embodiment of the present disclosure with reference to Figs. 7, 8, 9 to 10, the self-cleaning device 140 comprises a rotary arm 143, wherein the rotary arm 143 is rotatably mounted on the container lid 120, and the spray outlet 142 is arranged on the rotary arm 143. The method of attachment of the rotary arm 143 to the container lid 120 is not restricted. For example, the rotary arm 143 can be rotatably mounted on the container lid 120 by means of bearings or, alternatively, rotatably attached to the container lid 120 by means of self-lubricating bushings or similar devices. The rotary arm 143 can be mounted vertically on the container lid 120, that is, the pivot point of the rotary arm 143 runs parallel to the vertical direction of the wastewater container 100 (as shown in the Z-direction in Fig. 7).The rotary arm 143 can also be mounted obliquely on the container lid 120, meaning that the pivot point of the rotary arm 143 is inclined to the vertical direction of the wastewater tank 100. In an embodiment shown in Fig. 7, the rotary arm 143 is mounted vertically on the container lid 120, which simplifies positioning and assembly between the rotary arm 143 and the container lid 120 and reduces machining and assembly complexity. The spray outlet 142 can be arranged multiple times along the longitudinal or vertical direction of the rotary arm 143, or only a single spray outlet can be mounted, the specific design of which must meet the cleaning requirements of the wastewater chamber 110. Referring to Figures 8 and 10, a flow channel 1431 is formed inside the rotary arm 143, the flow channel 1431 connecting the supply inlet 141 to the spray outlet 142. The flow channel 1431 can be configured as a channel with a constant cross-section or as a channel with a variable cross-section. The flow channel 1431 can have a straight flow path, a curved flow path (such as L-shaped, U-shaped), an arc-shaped flow path (such as S-shaped), or any other desired shape. The positioning of the self-cleaning device 140 must be determined during the actual design process. By incorporating a flow channel 1431 inside the rotary arm 143, an integrated arrangement of the flow channel 1431 and the spray outlet 142 can be achieved.This not only ensures the continuity and stability of the water supply to the spray outlet 142, but also increases the compactness of the structure of the rotary arm 143, reduces the interior space occupied by the wastewater chamber 110 and secures the wastewater volume of the wastewater chamber 110. In one embodiment of the present disclosure with reference to Figs. 8, 9 to 10, the rotary arm 143 comprises a pivot axis 1432 and a rod body 1433, wherein one end of the pivot axis 1432 is rotatably connected to the container lid 120 and the other end of the pivot axis 1432 is connected to the rod body 1433, the spray outlet 142 being arranged on the rod body 1433. The pivot axis 1432 can be rotatably connected to the container lid 120 by means of bearings, self-lubricating bushings, fits in the axle hole, or in any other manner; this embodiment is not limited. Referring to Figures 8, 9 to 10, the axis of rotation 1432 is arranged within the wastewater chamber 110 along the vertical direction of the wastewater tank 100 on the side facing the tank lid 120, while the rod body 1433 is positioned on the side facing away from the tank lid 120. Referring to Figures 5 and 10, the rod body 1433 comprises, in particular, a mounting part 14331 and two extension sections 14332, wherein the two extension sections 14332 are arranged symmetrically on the two sides of the mounting part 14331, the mounting part 14331 having an approximately cylindrical structure and being connected to the axis of rotation 1432. The extension section 14332 can be configured in any shape, for example, as a round rod, a rectangular rod, or a polygonal rod. In the present embodiment, the extension section 14332 has a round bar structure.The shape of the round bar is symmetrical, the center of gravity is evenly distributed, which maintains a good dynamic balance during rotation, reducing the vibrations and fluctuations caused by the rotational movement of the bar body 1433. In the present embodiment, connecting one end of the rotary axis 1432 to the container lid 120 and the other end to the rod body 1433 makes the structure of the entire rotary arm 143 more compact. This allows it to better adapt to the limited interior space of the container lid 120 and avoids excessive use of the installation space. Simultaneously, by arranging the spray outlet 142 on the rod body 1433 and adjusting its position along the rod body 1433, the spray path during the rotation of the rod body 1433 can be regulated, thereby achieving better coverage of the various areas of the chamber wall of the wastewater chamber 110 and thus improving cleaning efficiency.Furthermore, by adjusting the number of spray outlets 142, both the flow rate and the pressure of the spray water can be changed, thereby regulating the rotational speed and cleaning efficiency of the rod body 1433. This design allows the self-cleaning device 140 to better adapt to the cleaning requirements of wastewater chambers 110 of different shapes and sizes, thus increasing the adaptability and flexibility of the self-cleaning device 140. In an embodiment of the present disclosure with reference to Figs. 8 and 9, the flow channel 1431 comprises a first channel 14311 and a second channel 14312 connected to each other, the first channel 14311 extending in the axial direction of the axis of rotation 1432. The upper part of the first channel 14311 penetrates the axis of rotation 1432 and is connected to the supply inlet 141. The lower part of the first channel 14311 is connected to one end of the second channel 14312. It should be explained that the upper and lower parts of the first channel 14311 are oriented vertically in the direction of the wastewater chamber 110, with the end closer to the water outlet 132 being referred to as the upper part and the end farther from the water outlet 132 as the lower part. The other end of the second channel 14312 extends along the longitudinal direction of the rod body 1433, with the spray outlet 142 being located on the side wall of the second channel 14312. The first channel 14311 runs along the axial direction of the axis of rotation 1432, while the second channel 14312 runs along the longitudinal direction of the rod body 1433. This not only facilitates the form-fitting design of the first channel 14311 and the second channel 14312, but also reduces the number of bends in the flow channel 1431, thereby decreasing the pressure loss when the clear water flows through the flow channel 1431. Simultaneously, the spray outlet 142 is located on the side wall of the second channel 14312, allowing it to be positioned closer to the chamber wall of the wastewater chamber 110. This shortens the spray distance, intensifies the impact of the water jet, and thus improves the cleaning effect on the chamber wall of the wastewater chamber 110. In an embodiment of the present disclosure with reference to Figs. 8 and 11, the container lid 120 comprises a receiving chamber 123, wherein the axis of rotation 1432 is rotatably arranged in the receiving chamber 123, and the rod body 1433 extends outside the receiving chamber 123. The receiving chamber 123 has the shape of a cylinder adapted to the shape of the axis of rotation 1432, the axis of rotation 1432 being arranged coaxially with the receiving chamber 123. Along the vertical direction of the wastewater chamber 110, the opening of the receiving chamber 123 is aligned with the bottom wall of the wastewater chamber 110. The axis of rotation 1432 may be located partially or completely within the receiving chamber 123.In the present embodiment, the axis of rotation 1432 is located entirely within the receiving chamber 123 along the vertical direction of the wastewater chamber 110; that is, the depth of the receiving chamber 123 is greater than the axial length of the axis of rotation 1432. The mounting part 14331 of the rod body 1433 projects at least partially into the receiving chamber 123 to establish a connection with the axis of rotation 1432. The extension sections 14332 located on both sides of the mounting part 14331 are situated outside the receiving chamber 123. Referring to Fig. 8, the water outlet 132 is arranged on the ceiling wall of the receiving chamber 123, with the supply inlet 141 being attached to the axis of rotation 1432, i.e., at the end furthest from the rod body 1433, and being vertically connected to the water outlet 132. It should be noted that the upward and downward directions used here refer to the vertical direction of the wastewater tank 100. In particular, the water outlet 132 is a cylindrical hole and is arranged coaxially with the receiving chamber 123. In particular, the supply inlet 141 is a conical bore and is arranged coaxially with the axis of rotation 1432. The end of the conical bore with the larger diameter is connected to the water outlet 132, so that the clear water exiting the water outlet 132 can enter the supply inlet 141. In the present embodiment, mounting the pivot axis 1432 in the receiving chamber 123 and extending the rod body 1433 beyond the receiving chamber 123 makes the entire self-cleaning device 140 more compact in the vertical direction of the wastewater chamber 110. This design allows for optimal use of the interior space of the wastewater tank 100 and avoids unnecessary waste of space. Since the pivot axis 1432 is mounted in the receiving chamber 123, the receiving chamber 123 can simultaneously provide more stable support for the pivot axis 1432. This reduces swaying and vibrations during the rotation of the rotary arm 143 and improves the stability of the rotational operation of the self-cleaning device 140.Furthermore, by arranging the water outlet 132 on the ceiling wall of the receiving chamber 123 and the supply inlet 141 on the axis of rotation 1432, and by connecting them vertically, a direct flow transfer between the water outlet 132 and the supply inlet 141 can be achieved during the rotation of the axis of rotation 1432, without the need for additional complex swivel joints. Therefore, the structural design can be simplified and manufacturing and assembly costs reduced. In an embodiment of the present disclosure with reference to Figs. 8 and 10, the rotary axis 1432 and the rod body 1433 are snap-fit ​​connected by means of the clamping structure 150. In particular, the rotary axis 1432 is snap-fit ​​connected to the mounting part 14331 of the rod body 1433. The type of clamping structure 150 can be varied. In one embodiment, the clamping structure 150 can consist of an elastic clamping claw and a clamping groove, wherein either the elastic clamping claw or the clamping groove is attached to the rotary axis 1432 and the other to the mounting part 14331. By snapping the elastic clamping claw into the clamping groove, a snap-fit ​​connection is created between the rotary axis 1432 and the mounting part 14331, that is, a snap-fit ​​connection is established between the rotary axis 1432 and the rod body 1433.In another embodiment, the clamping structure 150 can also consist of a conical bore and a conical body, wherein either the conical bore or the conical body is attached to the rotary axis 1432 and the other to the mounting part 14331. By inserting the conical body into the conical bore, a snap-fit ​​connection is created between the rotary axis 1432 and the mounting part 14331, that is, a snap-fit ​​connection is established between the rotary axis 1432 and the rod body 1433. By using a clamping structure 150 in the above embodiment, the rotary axis 1432 is connected to the rod body 1433, enabling quick separation of the rotary axis 1432 from the rod body 1433 and thus realizing a modular design. If the spray outlet 142 becomes clogged, the rod body 1433 can be directly disassembled and cleaned, thereby avoiding the complex process of completely disassembling the rotary axis 1432 in conventional designs and significantly reducing maintenance complexity. Simultaneously, the rotary axis 1432 is connected to the rod body 1433 by the clamping structure 150, allowing for disassembly and assembly without special tools. The disassembly and assembly steps are simple, and the efficiency is relatively high. In an embodiment of the present disclosure with reference to Figs. 8 and 10, the clamping structure 150 comprises a clamping block 151 and a clamping groove 152, wherein the clamping block 151 and the clamping groove 152 snap together correspondingly, the clamping block 151 and the clamping groove 152 being arranged on the axis of rotation 1432 and on the rod body 1433, respectively. In particular, the clamping block 151 and the clamping groove 152 are each attached to the axis of rotation 1432 and the mounting part 14331 of the rod body 1433. In an embodiment with reference to Fig. 8, the clamping block 151 is arranged at the end of the axis of rotation 1432 facing the rod body 1433, wherein the clamping groove 152 is arranged at the end of the mounting part 14331 facing the axis of rotation 1432. The clamping block 151 can be a ring-shaped structure surrounding the axis of rotation 1432, or structures of several clamping blocks 151 arranged at intervals on the outer circumference of the axis of rotation 1432.The shape of the clamping groove 152 is matched to the shape of the clamping block 151 to create a snap-fit ​​connection between the clamping groove 152 and the clamping block 151. In the present embodiment, the clamping block 151 is arranged as an annular structure around the axis of rotation 1432, with the clamping groove 152 being arranged as an annular groove structure around the mounting part 14331. In other embodiments, the clamping groove 152 can be arranged at the end of the axis of rotation 1432 facing the rod body 1433, with the clamping block 151 being arranged at the end of the mounting part 14331 facing the axis of rotation 1432. Simultaneously, the axis of rotation 1432 is connected to the rod body 1433 by the use of a clamping structure 150 consisting of the clamping block 151 and the clamping groove 152.This not only allows for easy disassembly and assembly between the rotary axis 1432 and the rod body 1433, as well as increased stability and reliability of the connection between the rod body 1433 and the rotary axis 1432, but the simple structure of the clamping block 151 and the clamping groove 152 also facilitates manufacturing, which contributes to reducing manufacturing costs. In an embodiment of the present disclosure with reference to Figs. 8 and 10, the rotary axis 1432 is rotatably mounted on the container lid 120 by means of a bearing 144. The bearing 144 can be an angular contact ball bearing, a deep groove ball bearing, or any other bearing that meets the support requirements. The number of bearings 144 can be either one or two. The bearing 144 can either be rigidly connected to the container lid 120 by the bearing housing or connected to the container lid 120 by other mounting sleeves or similar structures attached to the container lid 120. In the present embodiment, the rotary axis 1432 is rotatably mounted on the container lid 120 by means of a bearing 144. Since the bearing 144 has a standardized component structure, its specification and model range is relatively broad and can be flexibly selected according to the requirements for the load, speed, and precision of the rotary axis 1432.At the same time, the market for standardized bearings 144 is well supplied and procurement costs are relatively low, which contributes to reducing overall manufacturing costs. In an embodiment of the present disclosure with reference to Figs. 8 and 13, the receiving chamber 123 comprises interconnected blind-hole section 1231 and stepped section 1232. The blind-hole section 1231 and the stepped section 1232 are arranged coaxially, with the stepped section 1232 being located near the opening of the receiving chamber 123 relative to the blind-hole section 1231. The axis of rotation 1432 comprises an interconnected flange part 14321 and a column body part 14322, the column body part 14322 connecting the flange part 14321 to the rod body 1433. The bearing 144 is mounted on the column body part 14322. The outer diameter of the column body part 14322 corresponds to the inner diameter of the bearing 144, with the bearing 144 being mounted on the column body part 14322 and forming a mate connection. The flange part 14321 is mounted in the blind hole section 1231, with the bearing 144 being installed in the step section 1232.The outer diameter of the flange part 14321 is larger than the inner diameter of the bearing 144, wherein the flange part 14321 is at least partially in contact with the end face of the bearing 144 at the end facing the step section 1232 in order to ensure an axial support function of the bearing 144 for the flange part 14321. The design in the above embodiment allows the bearing 144 to provide effective axial support for the flange part 14321. This axial support function prevents axial play in the rotary axis 1432 and thus ensures the positional accuracy and stability of the rotary axis 1432. At the same time, due to the mounting of the flange part 14321 of the rotary axis 1432 in the blind hole section 1231 and the corresponding mounting of the column body part 14322 with the bearing 144 in the stepped section 1232, this segmented structure and fit arrangement is designed so that the individual components interact closely. This allows for optimal use of the available installation height, which reduces the overall installation volume and thus promotes a more compact design. In an embodiment of the present disclosure with reference to Figs. 5 and 8, a sealing cap 160 is attached to the opening of the receiving chamber 123. The sealing cap 160 supports one end of the bearing 144 that faces away from the blind hole section 1231 and seals the mounting gap between the bearing 144 and the stepped section 1232. The shape of the sealing cap 160 is adapted to the opening shape of the receiving chamber 123. The sealing cap 160 closes the opening of the receiving chamber 123 and is provided with a through-hole through which the axis of rotation 1432 or the mounting part 14331 of the rod body 1433 passes. The sealing cap 160 can be fastened to the opening area of ​​the receiving chamber 123 either by screws or by a clamping connection. In the present embodiment with reference to Fig.In section 8, the receiving chamber 123 is provided with an annular projection 1233 at its opening. The sealing cap 160 is equipped with an annular groove 161 at one end facing the receiving chamber 123. The annular projection 1233 is clamped into the annular groove 161, thus creating a clamping connection between the sealing cap 160 and the receiving chamber 123. This arrangement facilitates the disassembly and assembly of the sealing cap 160, thereby simplifying the maintenance and replacement of the bearing 144 and the pivot shaft 1432 installed in the receiving chamber 123. In the above embodiment, a sealing cap 160 is attached to the opening of the receiving chamber 123, so that this sealing cap 160 can seal the mounting gap between the bearing 144 and the receiving chamber 123, thereby reducing the risk of clear water escaping from the supply inlet 141 through the mounting gap of the bearing 144. This ensures a stable spray quantity at the spray outlet 142. At the same time, the sealing cap 160 prevents wastewater and dust from the wastewater chamber 110 from entering the area between the bearing 144 and the receiving chamber 123, thus reducing wear on the bearing 144 and ensuring its proper operation.Furthermore, the sealing cap 160 forms a support at the end of the bearing 144 facing away from the blind hole section 1231. This not only improves the axial positioning accuracy of the bearing 144 and reduces the risk of the bearing 144 dropping out, but also transfers the axial force of the bearing 144 via the sealing cap 160 to the main structure of the receiving chamber 123. This further increases the axial stability of the bearing 144 and reduces axial deformation and wear. In one embodiment of the present disclosure with reference to Fig. 15, the injection outlet 142 is arranged at at least one end of the rod body 1433 in the longitudinal direction, and the injection direction of the injection outlet 142 forms an angle with the longitudinal direction of the rod body 1433. The exact size of the angle is not specified, as long as it is ensured that the recoil force generated by the injection from the injection outlet 142 onto the rod body 1433 is capable of causing the rod body 1433 to rotate. In particular, injection outlets 142 are arranged at both ends of the rod body 1433 in the longitudinal direction, that is, injection outlets 142 are arranged on the extension sections 14332 located on both sides of the mounting part 14331. The number of spray outlets 142 arranged on each lateral extension section 14332 can be the same or different.The angle between the spray direction of the spray outlet 142 on the extension section 14332 on each side and the longitudinal direction of the rod body 1433 can be the same or different. The actual design must be adapted to the requirements for the rotational speed of the rod body 1433. This arrangement allows a recoil force to be generated at both ends of the rod body 1433 during spraying from the spray outlet 142, causing a rotational movement of the rod body 1433. In another embodiment, the spray outlet 142 can be arranged only at one end of the rod body 1433 in the longitudinal direction, and the spray direction of the spray outlet 142 forms an angle with the longitudinal direction of the rod body 1433. In particular, the spray outlet 142 is attached only to the extension section 14332 located on one side.This arrangement allows a recoil force to be generated at one end of the rod body 1433 when ejecting from the injection outlet 142, causing a rotational movement of the rod body 1433. In the above embodiment, the spray outlet 142 is arranged at at least one end of the rod body 1433 in the longitudinal direction, and the spray direction of the spray outlet 142 forms an angle with the longitudinal direction of the rod body 1433. This design not only allows the recoil force of the water jet to be used for self-propelled rotation of the rod body 1433, but can also generate a complex water flow with axial and radial components along the rod body 1433. This overcomes the limitations of conventional direct jet methods by extending the water jet area from the axial direction of the rod body 1433 to the circumferential area, thus enabling comprehensive cleaning of the chamber wall of the wastewater chamber 110. In one embodiment of the present disclosure with reference to Fig. 15, two spray outlets 142 are provided, wherein the two spray outlets 142 are arranged at the two ends of the rod body 1433 in the longitudinal direction, the spray directions of the two spray outlets 142 being opposite. In particular, two spray outlets 142 are arranged at the extension sections 14332 on both sides of the mounting part 14331. The spray direction of the spray outlet 142 can be perpendicular to the longitudinal direction of the rod body 1433 or at a non-perpendicular angle to the longitudinal direction of the rod body 1433. In the present embodiment, the spray direction of the spray outlet 142 is perpendicular to the longitudinal direction of the rod body 1433.It should be noted that in the present embodiment the spray direction of the spray outlet 142 is arranged perpendicular to the longitudinal direction of the rod body 1433, which means that the spray direction of the spray outlet 142 on the projection of the rod body 1433 along the vertical direction of the wastewater chamber 110 is perpendicular to the longitudinal direction of the rod body 1433. In the aforementioned embodiments, two spray outlets 142 are arranged at each end of the rod body 1433 in the longitudinal direction, with their spray directions being opposite. This arrangement allows the recoil forces of the two oppositely arranged spray outlets 142 on the rod body 1433 to balance each other. As a result, the rod body 1433 receives a more stable and uniform torque, which prevents vibrations or deviations due to uneven loading. At the same time, the design of a double-sided back spray allows the water jet to act simultaneously on both sides of the rod body 1433 in the longitudinal direction, thus enabling synchronous cleaning of the areas on both sides of the wastewater chamber 110, which in turn increases cleaning efficiency. In an embodiment of the present disclosure with reference to Figs. 3 and 5, two self-cleaning devices 140 are arranged on the container lid 120, wherein the water inlet channel 130 is provided with two water outlets 132, each self-cleaning device 140 being assigned one water outlet 132. The exact arrangement of the two self-cleaning devices 140 on the container lid 120 is not limited. For example, the two self-cleaning devices 140 can be arranged along the longitudinal direction of the container lid 120 (as shown in Fig. 2 along the X-axis), or along the transverse direction of the container lid 120 (as shown in Fig. 2 along the Y-axis), or along the diagonal direction of the container lid 120, the specific arrangement being required to meet the cleaning requirements of the chamber wall of the wastewater chamber 110.In other embodiments, two or more self-cleaning devices 140 can also be arranged on the container lid 120; for example, the number of self-cleaning devices 140 can be three, four, or more. By arranging at least two self-cleaning devices 140 on the container lid 120, each of which is assigned to a water outlet 132, more comprehensive coverage and cleaning of the wastewater chamber 110 is ensured. Compared to the concept with a single self-cleaning device 140, a concept with at least two self-cleaning devices 140 allows for the simultaneous cleaning of different areas of the chamber wall of the wastewater chamber 110, thereby increasing cleaning efficiency and reducing cleaning time. In one embodiment of the present disclosure with reference to Figs. 3 and 12, the water inlet channel 130 comprises two water outlets 132, the two water outlets 132 being arranged at the two ends of the water inlet channel 130 in the extension direction, with the water inlet 131 located between the two water outlets 132. The water inlet 131 can be located midway between two water outlets 132 or near one of the water outlets 132. In the present embodiment, the water inlet 131 is located approximately midway between the two water outlets 132. This not only allows for precise positioning of the water inlet 131 within the water inlet channel 130, but also ensures a more uniform distribution of the water flow to the two water outlets 132.This prevents the water outflow from being too large or too small on one side, which improves the stability and consistency of the water flow at the two-sided spray outlets 142. In an embodiment of the present disclosure with reference to Figs. 16, 17, 18 to 19, the container lid 120 comprises a lid body 121 and a cover plate 122. The shape of the lid body 121 corresponds to the shape of the opening 111 of the wastewater chamber 110, in order to cover the opening 111 of the wastewater chamber 110. The lid body 121 is provided with a groove 1211, and the cover plate 122 abuts the groove 1211, so that the groove 1211 and the cover plate 122 together define at least a portion of the water inlet channel 130. The groove 1211 can be arranged either on the side of the lid body 121 facing the wastewater chamber 110 or on the side of the lid body 121 facing away from the wastewater chamber 110. In one embodiment, the groove 1211 is arranged on the side of the cover body 121 facing away from the wastewater chamber 110.This arrangement facilitates cleaning by allowing the cover plate 122 to be opened if the groove 1211 becomes clogged. The cross-section of the groove 1211 can have various shapes, such as rectangular, semicircular, or U-shaped. The length of the groove 1211 can correspond to the length of the water inlet channel 130, meaning the entire water inlet channel 130 is formed by the combination of the groove 1211 and the cover plate 122. Alternatively, the length of the groove 1211 can be shorter than the length of the water inlet channel 130, meaning that the water inlet channel 130 is formed by the combination of the groove 1211 and the cover plate 122 only in a partial section. In the present embodiment with reference to Fig. 12, Fig. 13 and Fig. 18, the cross-section of the groove 1211 has a rectangular cross-section, and the length of the groove 1211 is shorter than the length of the water inlet channel 130.In particular, a through-hole section 134 is arranged at each of the two ends of the groove 1211 in the longitudinal direction along the extension of the water inlet channel 130. The through-hole section 134 is integrally formed inside the cover body 121, with each through-hole section 134 forming a water outlet 132. For the sake of simplicity, the portion of the water inlet channel 130 jointly bounded by the groove 1211 and the cover plate 122 is referred to as groove section 133. In the present embodiment, the water inlet channel 130 comprises a groove section 133 and through-hole sections 134 connected to both ends of the groove section 133.This arrangement not only facilitates the processing and shaping of the water inlet channel 130, but also enables the formation of the water outlet 132 at the position of the receiving chamber 123 in the water inlet channel 130, thereby improving the structure of the water inlet channel 130 in terms of both rationality and ease of manufacture. The combination of the groove 1211 and the cover plate 122 in the above embodiment forms a water inlet channel 130, which allows for simpler machining compared to a one-piece, closed tubular channel integrated into the lid body 121. Furthermore, the groove 1211 can be formed directly on the lid body 121 using various methods such as injection molding or stamping, eliminating the need for complex chamber tools or additional pipe assemblies. This reduces the production costs of the water inlet line 114 and increases production efficiency. At the same time, if the water inlet channel 130 becomes clogged, the debris in the groove 1211 can be removed directly by simply opening the cover plate 122, without having to disassemble the entire container lid 120 or use special cleaning tools.This open structure facilitates inspection and maintenance, allows for quick restoration of the continuity of the water inlet channel 130 and improves the ease of maintenance as well as the long-term reliability of the water inlet channel 130. In an embodiment of the present disclosure with reference to Figs. 3, 11, 12 and 17, the container lid 120 further comprises a raised portion 124, wherein the raised portion 124 is arranged on the lid body 121 and extends along the longitudinal direction of the water inlet channel 130. The raised portion 124 can be arranged either on the side of the lid body 121 facing the interior of the wastewater chamber 110 or on the side of the lid body 121 facing away from the interior of the wastewater chamber 110. In the present embodiment, the raised portion 124 is arranged on the side of the lid body 121 facing the interior of the wastewater chamber 110. The shape of the raised part 124 corresponds to the shape of the water inlet channel 130; for example, the raised part 124 is a corresponding linear shape if the water inlet channel 130 is designed linearly.If the water inlet channel 130 has a curved shape (e.g., S-shape), the raised section 124 corresponds to a similar curved shape. A cavity is formed between the raised section 124 and the lid body 121, forming a water inlet channel 130. In one embodiment, the raised section 124 can be provided with a groove along the thickness direction of the container lid 120 on the side facing the lid body 121, with the lid body 121 engaging in the groove to form a cavity. In another embodiment, the lid body 121 can also be provided with a groove on the side facing the raised section 124, with the raised section 124 resting in the groove to form a cavity. In the present embodiment, the specific shape of the cavity is not restricted. In the above embodiment, the arrangement of the raised section 124 increases the thickness only in a partial area of ​​the cover body 121, instead of thickening the entire cover body 121. This type of local thickening does not lead to a significant increase in the weight of the cover body 121, which facilitates the implementation of a lightweight design. At the same time, the locally thickened raised section 124 increases the cross-sectional area of ​​the water inlet channel 130, thereby increasing the water inlet flow rate to meet the requirements of the self-cleaning device 140 for a higher water inlet flow rate. Simultaneously, the raised section 124 can also act as a reinforcing rib, increasing the stiffness of the cover body 121 and thus improving its resistance to deformation. In an embodiment of the present disclosure with reference to Figs. 11, 16, and 17, the raised portion 124 is located along the thickness direction of the container lid 120 on the side of the groove 1211 facing away from the cover plate 122. In the thickness direction of the lid body 121, the projection of the raised portion 124 overlaps the projection of the groove 1211. The raised portion 124 is attached to the side of the groove 1211 facing away from the cover plate 122, so that the raised portion 124 is located inside the wastewater chamber 110 and not outside the container lid 120. This arrangement can reduce the vertical space occupied by the raised portion 124 on the outside of the container lid 120, thereby making the overall dimensions of the container lid 120 more compact and saving external space during assembly and use.Simultaneously, the overlap of the projection of the groove 1211 by the projection of the raised section 124 ensures that the width of the raised section 124 (as shown in direction X2 in Fig. 17) completely covers the entire width of the groove 1211 (as shown in direction X3 in Fig. 17). This allows the raised section 124 to provide sufficient space for the groove 1211 to maintain a greater depth, which in turn contributes to increasing the cross-sectional area of ​​the water inlet channel 130. In an embodiment of the present disclosure with reference to Figs. 3, 11, 18 and 19, the lid body 121 is provided with a groove 1211, the cover plate 122 being fitted into the groove 1211. Along the thickness direction of the lid body 121, the raised portion 124 is arranged on the side of the lid body 121 facing the interior of the wastewater chamber 110, that is, the raised portion 124 is located inside the wastewater chamber 110. The cover plate 122 is arranged on the side of the lid body 121 facing the exterior of the wastewater chamber 110, that is, the opening of the groove 1211 faces the exterior of the wastewater chamber 110, the cover plate 122 closes the groove 1211, and the cover plate 122 is located in the exterior of the wastewater chamber 110.On the side of the lid body 121 facing the outside of the wastewater chamber 110, the surface of the cover plate 122, which faces the outside of the wastewater chamber 110, is flush with the surface of the lid body 121 facing the outside of the wastewater chamber. By arranging the raised part 124 on the side of the lid body 121 facing the inside of the wastewater chamber 110, the interior of the wastewater chamber 110 can be optimally utilized, thus preventing the raised part 124 from protruding outwards and impairing the flatness of the outer structure of the container lid 120.Simultaneously, on the side of the lid body 121 facing the outside of the wastewater chamber 110, the surface of the cover plate 122 facing the outside of the wastewater chamber 110 is flush with the surface of the lid body 121 facing the outside of the wastewater chamber 110, so that the cover plate 122 and the outer surface of the lid body 121 form a flat structure. This ensures both the aesthetic appearance of the outside of the container lid 121 and the avoidance of potential spatial disturbances caused by protruding parts. In an embodiment of the present disclosure with reference to Figs. 17 and 19, a positioning platform 12111 is arranged at the opening edge of the groove 1211, the shape of the positioning platform 12111 being adapted to the contour shape of the cover plate 122, the circumference of the cover plate 122 resting at least partially on the positioning platform 12111. In particular, a stepped surface is arranged along the width direction of the groove 1211 on both sides of the opening edge of the groove 1211, the stepped surfaces of both sides together forming a positioning platform 12111. The two sides of the cover body 121 overlap the corresponding stepped surfaces in the width direction, thereby creating an overlapping connection between the cover plate 122 and the positioning platform 12111.The positioning platform 12111 allows it to perform a positioning and guiding function when the cover plate 122 covers the groove 1211. This enables quick and precise installation of the cover plate 122, increasing its assembly efficiency. Simultaneously, the positioning platform 12111 provides stable support for the cover plate 122, reducing the likelihood of it becoming loose or shifting due to external forces during use. This contributes to increasing the stability of the locking action of the groove 1211. In an embodiment of the present disclosure with reference to Figs. 20 and 21, a clear water inlet 112 is arranged on the side wall of the wastewater chamber 110 (i.e., the side wall of the container body 117), the clear water inlet 112 being connected to the water inlet 131. The clear water inlet 112 can be attached to any side wall of the circumferential side wall body of the wastewater chamber 110. For example, it can be attached to one of the two side walls of the wastewater chamber 110 in the longitudinal direction or to one of the two side walls of the wastewater chamber 110 in the transverse direction. In the present embodiment, the clear water inlet 112 is arranged on the side wall of the wastewater chamber 110 in the width direction (as shown in direction Y1 in Fig. 21), with the position of the clear water inlet 112 being approximately in the middle area of ​​the wastewater chamber 110 in the length direction (as shown in direction X1 in Fig. 20).When the self-cleaning device 140 is in operation, the clear water from the clear water supply line flows through the clear water inlet 112 into the water inlet 131 and is then directed through the water inlet channel 130 into the interior of the self-cleaning device 140. As shown in Fig. 20, a drain opening 113 is provided on the bottom wall of the wastewater chamber 110, whereby the drain opening 113 can be located either in the center of the bottom wall or at an eccentric position on the bottom wall. By installing a clear water inlet 112 on the side wall of the wastewater chamber 110 and a drain opening 113 on the bottom wall of the wastewater chamber 110, the clear water inlet 112 can be positioned close to the opening 111 of the wastewater chamber 110. This allows the clear water inlet 112 to be located away from the bottom wall of the wastewater chamber 110, thus preventing wastewater from entering the clear water inlet 112, preventing contamination of the clear water, and ensuring the purity of the clear water. Furthermore, due to gravity, the wastewater and impurities generated after cleaning the chamber wall of the wastewater chamber 110 settle at the bottom of the chamber.Therefore, the arrangement of a drain opening 113 on the bottom wall of the wastewater chamber 110 can effectively drain the wastewater and deposits, reduce the long-term deposition of wastewater and dirt on the bottom of the wastewater chamber 110 and improve the cleaning efficiency of the wastewater tank 100. In an embodiment of the present disclosure with reference to Figs. 1, 4 and 5, the container lid 120 is rotatably connected to the wastewater chamber 110 and can be switched between a first position in which the opening 111 is covered and a second position in which the opening 111 is open. The rotatable connection can be designed as a hinge connection, pivot connection or similar. In particular, in the present embodiment, as shown in Figs. 4 and 5, two adjacent support axes 1171 are attached to the container body 117 near the edge of the opening 111, with corresponding mounting bores 1201 located at corresponding positions on the container lid 120, each support axe 1171 being inserted into a mounting bore 1201 and rotatable within the mounting bore 1201.When the container lid 120 switches between the first position (covering the opening 111) and the second position (opening the opening 111), the container lid 120 is rotated by the support axis 1171 along the axis of the mounting bore 1201, thereby creating a rotatable connection between the container lid 120 and the container body 117. This rotatable connection has a simple structure and is easy to assemble and maintain. At the same time, it ensures a stable and reliable rotatable connection between the container lid 120 and the container body 117. With reference to Figures 5 and 21, a water inlet pipe 114 is further arranged in the wastewater chamber 110, the water inlet pipe 114 connecting the clear water inlet 112 to the water inlet 131. The water inlet pipe 114 can have various structures, such as a bent pipe, a straight pipe, or a combination of bent and straight pipes. The water inlet pipe 114 can consist entirely of a rigid pipe structure, entirely of a flexible pipe structure, or be composed partly of a rigid and partly of a flexible pipe structure. In the present embodiment, the water inlet pipe 114 consists entirely of a flexible pipe structure. The flexible water inlet pipe 114 (such as a rubber hose, corrugated hose, or silicone hose) has excellent bending and elongation properties, which allow it to deform freely with the rotation of the container lid 120.This prevents tensile forces, deformations or loosening at the hose connection points from occurring when opening and closing the container lid 120, thus ensuring the tightness and reliability of the water inlet channel 130. In the above embodiment, the container lid 120 is attached to the wastewater chamber 110 by a swivel joint. This design allows the operator to quickly open the container lid 120 to perform maintenance, cleaning, or inspections of the system without having to go through a time-consuming disassembly and reassembly process. For example, when removing deposits from the wastewater chamber 110 or inspecting the internal components, the container lid 120 can simply be rotated into the second position, which significantly increases operational efficiency. A water inlet pipe 114 is installed in the wastewater chamber 110, which facilitates and speeds up the connection between the clear water inlet 112 and the water inlet 131.During assembly, only the two ends of the water inlet pipes 114 need to be connected to the clear water inlet 112 and the water inlet 131 respectively, which ensures simple and easy handling. In one embodiment of the present disclosure with reference to Figs. 22 and 23, a valve assembly 170 is arranged at the drain opening 113, wherein the valve assembly 170 opens the drain opening 113 in response to the docking of the wastewater tank 100 to the cleaning station. In one embodiment, the valve assembly 170 can be a solenoid valve. A solenoid valve is a device that controls the opening and closing of a valve by controlling electromagnetic force. When the wastewater tank 100 docks to the cleaning station, the cleaning station can send an electrical signal to activate the solenoid valve and thus open the drain opening 113. In another embodiment, the valve assembly 170 can also be a pneumatic valve, wherein the air pressure controls the opening and closing of the pneumatic valve.The cleaning station can be equipped with an air pump and, when the wastewater tank 100 is docked to the cleaning station, provide an air pressure signal to actuate the pneumatic valve to open the drain opening 113. In other embodiments, the valve assembly 170 can also be a mechanical valve. Mechanical valves can be opened and closed by physical contact or mechanical mechanisms. For example, the cleaning station can be equipped with a cam or a plunger that directly opens the valve when the wastewater tank 100 is docked to the cleaning station. In the present embodiment, the valve assembly 170 reacts automatically to the docking of the wastewater tank 100 to the cleaning station, thus enabling the automatic opening of the drain opening 113 and eliminating the need for manual intervention. This not only effectively increases the efficiency of opening the drain opening 113 but also reduces errors caused by improper manual operation, such as forgetting to open or close the drain opening 113. Therefore, problems such as wastewater leakage or equipment damage caused by operator error can be avoided. In one embodiment of the present disclosure with reference to Figures 22 and 23, the valve assembly 170 comprises a stop plate 171 and a plunger 172, wherein the stop plate 171 is rotatably connected to the chamber wall of the wastewater chamber 110, and the plunger 172 is arranged to slide within the wastewater chamber 110. The stop plate 171 can be arranged either inside the wastewater chamber 110 or outside of the wastewater chamber 110. In the present embodiment, the stop plate 171 is arranged outside the wastewater chamber 110. The rotary connection of the stop plate 171 to the wastewater chamber 110 can be effected in various ways, including, but not limited to, a rotary connection by means of a pivot axis. In the present embodiment, the stop plate 171 is rotatably mounted on the chamber wall of the wastewater chamber 110 by means of a pivot axis 174.In particular, a pivot axis 174 is fixedly connected to the chamber wall of the wastewater chamber 110. The stop plate 171 comprises a plate body 1711 and a connecting part 1712, wherein one end of the plate body 1711 is rotatably connected to the pivot axis 174 along the vertical direction of the wastewater chamber 110, while the other end of the plate body 1711 is fixedly connected to the connecting part 1712, the connecting part 1712 being able to be tightly connected to the drain opening 113. Referring to Figures 22 and 23, a chute 115 is arranged in the wastewater chamber 110, with both ends of the chute 115 penetrating the opposite side walls of the wastewater chamber 110 in the lateral direction. The plunger 172 is at least partially inserted in the chute 115, and the plunger 172 can slide along the extension direction of the chute 115 (i.e., in the lateral direction of the wastewater chamber 110). In particular, the plunger 172 comprises a sliding part 1721 and a thrust part 1722, one end of the sliding part 1721 being guided through the chute 115, while the other end of the sliding part 1721 extends toward the side of the stop plate 171 and is rigidly connected to the thrust part 1722. The pusher part 1722 is arranged outside the slide 115 and can interact with the stop plate 171 during the sliding process of the sliding part 1721, causing the stop plate 171 to rotate. Referring to Fig. 24, in response to the docking of the wastewater tank 100 to the cleaning station, the plunger mechanism 310 on the cleaning station moves the plunger 172 along the extension direction of the chute 115, whereby the plunger 172 rotates the stop plate 171 to open the drain opening 113. It should be noted that the specific structure of the plunger mechanism 310 on the cleaning station is not limited in this embodiment. For example, the plunger mechanism 310 can be an electric plunger structure, a pneumatic plunger structure, a hydraulic plunger structure, or any other mechanism that can move the plunger 172 within the chute 115 when the wastewater tank 100 docks to the cleaning station. Through the automatic actuation of the plunger mechanism 310 in the above embodiment at the cleaning station, the plunger 172 slides and thereby rotates the stop plate 171 to open the drain opening 113, thus eliminating the need for manual intervention during the entire process. This automated design can improve the ease of use when opening the drain opening 113 and reduce manual intervention, especially in situations where the drain opening 113 needs to be opened frequently, thereby effectively increasing work efficiency. In an embodiment of the present disclosure with reference to Figures 22 and 23, the valve assembly 170 further comprises an elastic return element 173, wherein the elastic return element 173 can be a spring, a torsion spring, or another elastic component. In response to the separation of the wastewater tank 100 from the cleaning station, the elastic return element 173 causes the stop plate 171 to rotate in the opposite direction to close the drain opening 113. In the present embodiment, the elastic return element 173 is a compression spring. In particular, a bypass chamber 116 is arranged on the tank body 117 near the drain opening 113, wherein the stop plate 171 is mounted in the bypass chamber 116 and is rotatable within the bypass chamber 116.The compression spring is arranged in the bypass chamber 116, with both ends of the compression spring bearing against the stop plate 171 and the chamber wall of the bypass chamber 116, respectively. As the plunger 172 rotates the stop plate 171 to open the drain opening 113, the compression spring is compressed and stores its spring force. In response to the separation of the wastewater tank 100 from the cleaning station, the compression spring releases its spring force to rotate the stop plate 171 in the opposite direction and close the drain opening 113. The arrangement of the elastic return element 173 in the above embodiment enables automatic closing of the drain opening 113. In response to the separation of the wastewater tank 100 from the cleaning station, the elastic return element 173 causes the stop plate 171 to rotate in the opposite direction to close the drain opening 113, with the entire process occurring without manual intervention. Therefore, this design can improve the efficiency of closing the drain opening 113 and simultaneously increase the user-friendliness of the closing process. In one embodiment of the present disclosure with reference to Figs. 25 and 26, the cleaning system further comprises a clear water supply line, wherein the clear water supply line fluidically connects the water inlet 131 and the overflow opening 410 of the clear water tank 400, the clear water tank 400 being arranged at the cleaning system. In other embodiments, the clear water tank 400 can also be arranged at the cleaning station, wherein, when the cleaning system is docked to the cleaning station, the clear water supply line fluidically connects the water inlet 131 and the overflow opening 410 of the clear water tank 400.Through the fluidic connection of the water inlet 131 with the overflow opening 410 of the clear water tank 400, when the water level in the clear water tank 400 exceeds the set height, excess clear water automatically flows out through the overflow opening 410 and is automatically transported via the clear water supply line to the water inlet 131, thus providing the clear water supply to the self-cleaning unit 140 within the wastewater chamber 110. Therefore, it is not necessary to provide a separate water pump for the self-cleaning unit 140, as the entire water supply process for the self-cleaning unit 140 and the filling process of the clear water tank 400 can utilize a single water pump. This arrangement not only simplifies the system structure but also reduces manufacturing costs.At the same time, this design utilizes the natural overflow principle of the clear water tank 400 for water supply, thus eliminating the need for additional energy consumption and achieving an energy-efficient and environmentally friendly effect. The present disclosure provides a further cleaning station, the cleaning station being used in conjunction with the cleaning system described in the aforementioned embodiments. The cleaning station comprises a wastewater tank 100 according to one of the aforementioned embodiments. When the cleaning system returns to the cleaning station after completion of the cleaning operations, the wastewater generated during the cleaning process is pumped back into the wastewater tank 100. The specific structure of the wastewater tank 100 in this embodiment is described with reference to the aforementioned embodiment of the wastewater tank 100 and is not explained again here. Since this cleaning station uses the technical solution of the aforementioned wastewater tank 100, it exhibits at least the advantageous effects of the aforementioned embodiments. In one embodiment of the present disclosure, the cleaning station comprises a clear water supply line, wherein the clear water supply line fluidically connects the water inlet 131 and the overflow opening 410 of the clear water tank 400, the clear water tank 400 being arranged at the cleaning station. In other embodiments, the clear water tank 400 can also be arranged at the cleaning system, wherein, when the cleaning system is docked to the cleaning station, the clear water supply line fluidically connects the water inlet 131 and the overflow opening 410 of the clear water tank 400.Through the fluidic connection of the water inlet 131 with the overflow opening 410 of the clear water tank 400, when the water level in the clear water tank 400 exceeds the set height, excess clear water automatically flows out through the overflow opening 410 and is automatically transported via the clear water supply line to the water inlet 131, thus providing the clear water supply to the self-cleaning unit 140 within the wastewater chamber 110. Therefore, it is not necessary to provide a separate water pump for the self-cleaning unit 140, as the entire water supply process for the self-cleaning unit 140 and the filling process of the clear water tank 400 can utilize a single water pump. This arrangement not only simplifies the system structure but also reduces manufacturing costs.At the same time, this design utilizes the natural overflow principle of the clear water tank 400 for water supply, thus eliminating the need for additional energy consumption and achieving an energy-efficient and environmentally friendly effect. The above-mentioned embodiments serve only to illustrate the principles and effects of this disclosure and are not to be understood as limiting this disclosure. Any person familiar with this technology may modify or alter the above-mentioned embodiments without infringing the spirit and scope of this disclosure. Therefore, any equivalent modifications or alterations made by those skilled in the art in the relevant technical field, while retaining the spirit and technical concepts set forth in this disclosure, remain covered by the claims of this disclosure. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature CN 2025208633275,

[0001] CN 2025208633383,

[0001] CN 2025105706086 and

[0001] CN 2025208627236

[0001]

Claims

A wastewater tank (100) characterized in that it comprises: a wastewater chamber (110) having an opening (111) at the top of the wastewater chamber (110); a tank lid (120) that is removable and closes the opening (111); a water inlet channel (130) arranged on the tank lid (120) and having a water outlet (132) and a water inlet (131) that can be connected to a clear water supply line; a self-cleaning device (140) arranged on the tank lid (120) and located inside the wastewater chamber (110), wherein the self-cleaning device (140) comprises a supply inlet (141) and a spray outlet (142), the supply inlet (141) being connected to the water outlet (132); wherein the jet of clear water exiting the spray outlet (142) generates a recoil that Self-cleaning device (140) drives rotation. Wastewater container (100) according to claim 1, characterized in that the self-cleaning device (140) comprises a rotary arm (143), wherein the rotary arm (143) is rotatably attached to the container lid (120), wherein the spray outlet (142) is arranged on the rotary arm (143); wherein a flow channel (1431) is formed inside the rotary arm (143), wherein the flow channel (1431) connects the supply inlet (141) with the spray outlet (142). Wastewater container (100) according to claim 2, characterized in that the rotary arm (143) comprises a pivot axis (1432) and a rod body (1433), wherein one end of the pivot axis (1432) is rotatably connected to the container lid (120) and the other end is connected to the rod body (1433), wherein the spray outlet (142) is arranged on the rod body (1433). Wastewater tank (100) according to claim 3, characterized in that the tank lid (120) comprises a receiving chamber (123), wherein the axis of rotation (1432) is rotatably arranged in the receiving chamber (123), wherein the rod body (1433) extends outside the receiving chamber (123); wherein the water outlet (132) is arranged on the ceiling wall of the receiving chamber (123), wherein the supply inlet (141) is attached to the axis of rotation and is in vertical connection with the water outlet (132). Wastewater tank (100) according to claim 3, characterized in that the axis of rotation (1432) is rotatably mounted on the tank lid (120) by means of a bearing (144); wherein a receiving chamber (123) is arranged on the tank lid, wherein the receiving chamber (123) comprises a blind hole section (1231) and a stepped section (1232), wherein the stepped section (1232) is arranged in the vicinity of the opening (111) of the receiving chamber (123) compared to the blind hole section (1231); wherein the axis of rotation (1432) comprises a flange part (14321) and a column body part (14322), wherein the column body part (14322) connects the flange part (14321) to the rod body (1433), wherein the bearing (144) is fitted to the column body part (14322), wherein the flange part (14321) is mounted in the blind hole section (1231); wherein the bearing (144) is mounted in the step section (1232) and forms a support for the end of the flange part (14321) facing the step section (1232). Wastewater container (100) according to claim 1, characterized in that the container lid (120) comprises a lid body (121); wherein the water inlet channel (130) is arranged inside the lid body (121), and the projection of the lid body (121) covers the projection of the water inlet channel (130) along the thickness direction of the lid body (121). Wastewater container (100) according to claim 6, characterized in that the container lid (120) further comprises a raised part (124), wherein the raised part (124) is arranged on the lid body (121), wherein the raised part (124) extends along the longitudinal direction of the water inlet channel (130) and a cavity is formed between the raised part (124) and the lid body (121), wherein the cavity forms the water inlet channel (130). Cleaning system, characterized in that the cleaning system comprises the wastewater tank (100) mentioned in one of claims 1 to 7; wherein the cleaning system further comprises a clear water supply line, wherein the clear water supply line fluidically connects the water inlet (131) and the overflow opening (410) of the clear water tank (400), wherein the clear water tank (400) is arranged at the cleaning system or the cleaning station. Cleaning system according to claim 8, characterized in that it further comprises a suction device (500) which serves to draw an external water source into the clear water tank (400); wherein the clear water inlet (112) is connected to the overflow opening (410) so that the clear water exiting the overflow opening (410) can flow to the self-cleaning device (140) under the influence of gravity. Cleaning system according to claim 8, characterized in that at least a part of the clear water chamber (420) is located in the clear water tank (400) above the wastewater tank (100), wherein the position of the overflow opening (410) corresponds to the highest liquid level of the clear water chamber (420) above the wastewater tank (100).

Images