Sewage tank and cleaning robot comprising same

Abstract

The utility model provides a sewage tank and a cleaning robot comprising the sewage tank, and the sewage tank comprises a tank body, and a drainage pipe and a switch piece which are arranged in the tank body; an air outlet and a water pumping port are formed in the side wall of the box body, the air outlet is used for being connected with an external negative pressure device, and the water pumping port is used for pumping external sewage into the box body under the action of the negative pressure device; the box body is provided with a butt joint cavity used for being connected with an external base station, the interior of the box body is divided into an upper area and a lower area which are adjacent, one end of the drainage pipe is located at the position, close to the bottom of the box body, in the lower area, and the other end of the drainage pipe is connected with the butt joint cavity after passing through the upper area. The switch piece is arranged in the butt joint cavity and used for blocking or communicating the drainage pipe and the butt joint cavity. According to the sewage tank, the risk of sewage leakage can be remarkably reduced, and the cleaning robot is arranged based on the sewage tank, so that the reliability and the use experience of equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of cleaning technology, specifically to a sewage tank and a cleaning robot including the tank. Background Technology

[0002] During the cleaning operation of the cleaning robot, the clean water used will come into contact with impurities and dirt from the outside world and mix to form wastewater. This wastewater usually needs to be collected into the wastewater tank of the cleaning robot to avoid wastewater residue on the outside world, which would lead to poor cleaning effect.

[0003] However, existing sewage tanks are prone to leakage due to structural design limitations. The drain outlets of existing sewage tanks are generally located directly at the bottom of the tank, and the drain outlets are in constant contact with sewage, making leakage unavoidable. This leads to poor cleaning results, and the leaked sewage can even cause malfunctions in the cleaning robot, resulting in poor equipment safety and reliability. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a sewage tank and a cleaning robot including the tank, the specific technical solution of which is as follows:

[0005] A first aspect of this utility model is to provide a sewage tank, including a tank body and a drain pipe and a switch disposed in the tank body;

[0006] The side wall of the box is provided with an air outlet and a water inlet. The air outlet is used to connect to an external negative pressure device, and the water inlet is used to draw sewage from the outside into the box under the action of the negative pressure device.

[0007] The enclosure is provided with a docking cavity for connecting to an external base station. The interior of the enclosure is divided into an adjacent upper region and a lower region. One end of the drain pipe is located in the lower region near the bottom of the enclosure. After passing through the upper region, the other end of the drain pipe is connected to the docking cavity. The switch is disposed in the docking cavity and is used to block or connect the drain pipe and the docking cavity.

[0008] In one specific embodiment, the ratio of the length of the upper region in the height direction of the box to the length of the lower region in the height direction of the box is a positive number less than 1.

[0009] In one specific embodiment, the drain pipe has an inverted "U" shape, and the top of the drain pipe is located in the upper region near the top wall of the box.

[0010] In one specific embodiment, the drain pipe includes an adapter, a connecting pipe, and a first parallel pipe and a second parallel pipe that are parallel to each other.

[0011] The outer wall of the first parallel tube is fixedly connected to the inner side wall of the box body. One end of the first parallel tube is close to the bottom of the box body, and the other end is connected to the adapter. One end of the second parallel tube is fixedly connected to the docking cavity, and the other end is connected to the adapter. The two ends of the connecting tube are respectively connected to the first parallel tube and the second parallel tube through the adapter, and the outer wall of the connecting tube abuts against the inner top wall of the box body.

[0012] In one specific embodiment, the adapter includes an annular ring and an annular boss disposed on the inner edge of the annular ring, the ends of the first parallel tube and the second parallel tube are connected to their respective annular rings, and the annular boss is embedded in the connecting tube by the end of the connecting tube;

[0013] And / or, a connector is provided on the inner bottom wall of the box, a locking member is provided on the inner side wall of the box, the lower end of the first parallel tube is inserted into the connector, and the outer wall of the first parallel tube is fixedly connected to the locking member.

[0014] In one specific embodiment, the switching element includes a baffle and a rotating shaft sleeved with an elastic reset member. The rotating shaft is disposed in the mating cavity, the baffle is rotatably connected to the rotating shaft, and the baffle is connected to the elastic reset member.

[0015] The baffle is used to block the drain pipe from the docking cavity when rotated to a preset position, and to connect the drain pipe from the docking cavity when rotated away from the preset position; the elastic reset member is used to drive the baffle to rotate to the preset position.

[0016] In one specific embodiment, the housing is provided with a separator, a metal mesh, and a filter;

[0017] The separator is connected to the inner wall of the housing, the metal mesh is disposed on one side of the separator, and the filter is disposed between the air outlet and the separator.

[0018] In one specific embodiment, the separator includes a cyclone separator;

[0019] And / or, the separator includes a settling plate with multiple guide holes, the air outlet is connected to the interior of the housing through the guide holes, and the filter is disposed between the air outlet and the guide holes.

[0020] In one specific embodiment, when the separator includes the settling plate, the side wall of the settling plate is provided with a fastening member, and the settling plate is fastened to the inner wall of the housing through the fastening member; the top of the housing is provided with a through mounting groove, the top of the mounting groove is detachably provided with a sealing cover plate, the filter is disposed in the mounting groove, and the bottom of the filter is supported by the settling plate; the air outlet passes through the mounting groove and the guide hole in sequence and communicates with the interior of the housing;

[0021] It also includes a protective cover on the top of the box, one side of which is rotatably connected to the box, and the other side is detachably connected to the box by a snap fastener.

[0022] A second aspect of this utility model is to provide a cleaning robot, which includes a sewage tank as described in any of the above embodiments.

[0023] This utility model has at least the following beneficial effects:

[0024] This utility model provides a sewage tank and a cleaning robot including the same. The sewage tank has a drain pipe with one end located in the lower region near the bottom of the tank, and the other end connected to a docking cavity after passing through the upper region. This design allows sewage to flow upwards from the drain pipe into the docking cavity. When the external base station is not operational, the sewage has difficulty overcoming gravity to flow upwards, thus remaining at a lower position and making it difficult to flow to the other end of the drain pipe. The sewage does not remain in contact with the outlet for extended periods, reducing the likelihood of leakage. Furthermore, the switch mechanism can also block the connection between the drain pipe and the docking cavity, improving sealing and further reducing the possibility of sewage leakage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the sewage tank of this utility model;

[0027] Figure 2 This is a cross-sectional schematic diagram of the sewage tank of this utility model in one embodiment;

[0028] Figure 3 This is a schematic diagram of the internal structure of the sewage tank of this utility model;

[0029] Figure 4This is an exploded view of the overall structure of the sewage tank of this utility model;

[0030] Figure 5 This is a schematic diagram of the sedimentation plate and filter of this utility model;

[0031] Figure 6 This is a schematic diagram of a portion of the structure of the box in this utility model;

[0032] Figure 7 This is a partial structural diagram of the drainage pipe of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the switch component of this utility model.

[0034] Figure label:

[0035] 1-Box body; 11-Air outlet; 12-Water inlet; 13-Groove; 14-Mounting groove; 2-Drain pipe; 21-Adapter; 211-Annular ring; 212-Annular boss; 22-Connecting pipe; 23-First parallel pipe; 231-Hole; 24-Second parallel pipe; 3-Switch; 31-Baffle; 32-Rotating shaft; 321-Elastic reset component; 4-Mating cavity; 41-Fixing seat; 5-Pipe; 6-Rotating plate; 7-Protrusion; 8-Through hole; 9-Plug-in component; 10-Locking component; 151-Sinking plate; 1511-Guide hole; 1512-Snap fastener; 1513-Fence structure; 152-Metal mesh; 16-Filter; 17-Sealing cover; 18-Cavity; 19-Protective cover. Detailed Implementation

[0036] Various embodiments of the present invention will be described more fully below. The present invention may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present invention to the specific embodiments disclosed herein, but rather the present invention should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of the present invention.

[0037] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of the present invention, indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0038] In various embodiments of this utility model, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0039] The terms used in the various embodiments of this utility model (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above terms do not limit the order and / or importance of the elements. The above terms are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this utility model, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0040] It should be noted that, in this utility model, unless otherwise explicitly specified and defined, terms such as "installation," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Please refer to Figures 1 to 8 The present invention provides a sewage tank, including a tank body 1 and a drain pipe 2 and a switch 3 disposed in the tank body 1.

[0042] Specifically, the side wall of the housing 1 is provided with an air outlet 11 and a water inlet 12. The air outlet 11 is used to connect to an external negative pressure device, and the water inlet 12 is used to draw sewage from the outside into the housing 1 under the action of the negative pressure device.

[0043] The enclosure 1 is equipped with a docking cavity 4 for connecting to an external base station. The interior of the enclosure 1 is divided into an adjacent upper region A and a lower region B. One end of the drain pipe 2 is located in the lower region near the bottom of the enclosure 1, and the other end of the drain pipe 2 is connected to the docking cavity 4 after passing through the upper region A. A switch 3 is installed in the docking cavity 4 to block or connect the drain pipe 2 and the docking cavity 4.

[0044] In use, the wastewater tank of this invention is connected to an external negative pressure device via the air outlet 11. Under the action of the negative pressure device, a negative pressure is generated inside the tank 1, causing the external air pressure to force the external wastewater into the tank 1 through the inlet 12, thus collecting the wastewater. When wastewater needs to be discharged, the docking cavity 4 of the tank 1 is connected to the external base station, and the switch 3 is turned on to connect the drain pipe 2 to the docking cavity 4. The external base station draws out the wastewater from the tank 1 through the drain pipe 2. The wastewater in the tank 1 enters the drain pipe 2 near the bottom of the tank 1 and finally flows from the other end of the drain pipe 2 into the docking cavity 4, where it is collected by the external base station, completing the wastewater discharge.

[0045] In this invention, one end of the drain pipe 2 is located in the lower region B near the bottom of the housing 1, and the other end of the drain pipe 2 connects to the docking cavity 4 after passing through the upper region A. This design causes sewage to need to rise as it flows from the drain pipe 2 to the docking cavity 4. When the external base station is not in operation, the sewage has difficulty overcoming gravity to flow upward, and thus will remain at a lower position under the influence of gravity, making it difficult to flow to the other end of the drain pipe 2. The sewage will not be in contact with the outlet for a long time, thereby reducing the likelihood of sewage leakage. In addition, the switch 3 can also block the connection between the drain pipe 2 and the docking cavity 4, resulting in better sealing and further reducing the possibility of sewage leakage.

[0046] Optionally, the number of water inlets 12 may be one or more.

[0047] Please refer to Figure 1 and Figure 6 For example, the number of water inlets 12 can be two, and both water inlets 12 are connected to pipes 5 on one side inside the tank 1. A rotating plate 6 is provided at the end of the pipe 5 away from the water inlet 12. In practical applications, under the action of an external negative pressure device, outside air enters the tank 1 through the water inlet 12 and pushes the rotating plate 6 to rotate upward, allowing sewage to enter the tank 1. When the negative pressure device stops working, the rotating plate 6 rotates back under the action of gravity, thereby blocking the pipe 5 and preventing sewage from leaking out through the water inlet 12.

[0048] In one specific embodiment, please refer to Figure 2 The ratio of the length of the upper region A in the height direction y of box 1 to the length of the lower region B in the height direction y of box 1 is a positive number less than 1.

[0049] Understandably, the smaller this ratio, the smaller the proportion of the upper region A within the entire tank 1. To pass through the upper region A, the drain pipe 2 needs to climb a greater height, making it more difficult for sewage to flow to the other end of the drain pipe 2 and thus less prone to leakage. When this ratio approaches 0, the upper region A approaches the inner top wall of the tank 1, at which point the drain pipe 2 will be close to or in contact with the inner top wall of the tank 1.

[0050] In one specific embodiment, please refer to Figure 2 The drain pipe 2 can be in the shape of an inverted "U", and the top of the drain pipe 2 is located in the upper region near the inner top wall of the box 1.

[0051] For example, the inner top wall of the housing 1 can protrude outward to form a groove 13 adapted to the top of the drain pipe 2, and the top of the drain pipe 2 is embedded in the groove 13. As a result, the distance between the top of the drain pipe 2 and the end of the drain pipe 2 near the bottom of the housing 1 is further increased, which further increases the difficulty of sewage flowing along the drain pipe 2.

[0052] In one specific embodiment, please refer again to Figure 2 The drain pipe 2 may include an adapter 21, a connecting pipe 22, and a first parallel pipe 23 and a second parallel pipe 24 that are parallel to each other.

[0053] Specifically, the outer wall of the first parallel tube 23 is fixedly connected to the inner wall of the housing 1, one end of the first parallel tube 23 is close to the bottom of the housing 1, and the other end is connected to a connector 21. One end of the second parallel tube 24 is fixedly connected to the docking cavity 4, and the other end is connected to a connector 21. The two ends of the connecting tube 22 are connected to the first parallel tube 23 and the second parallel tube 24 respectively through the connector 21, and the outer wall of the connecting tube 22 abuts against the inner top wall of the housing 1.

[0054] For example, please refer to Figure 7 The adapter 21 may include an annular ring 211 and an annular boss 212 disposed on the inner edge of the annular ring 211. The ends of the first parallel tube 23 and the second parallel tube (not shown in the figure) are connected to their respective annular rings 211. The annular boss 212 is embedded in the connecting tube 22 by the end of the connecting tube 22. In some cases, a protrusion 7 may be provided on the side wall of the annular boss 212, and a corresponding through hole 8 may be provided on the connecting tube 22. After the annular boss 212 is embedded in the connecting tube 22, the protrusion 7 on its side wall is laterally embedded into the through hole 8, thereby achieving the fixation between the adapter 21 and the connecting tube 22.

[0055] In some embodiments, please refer to Figure 2A connector 9 can be provided on the inner bottom wall of the housing 1, and a locking member 10 can be provided on the inner side wall of the housing 1. The lower end of the first parallel tube 23 is inserted into the connector 9, and the outer wall of the first parallel tube 23 is fixedly connected to the locking member 10. Specifically, a hole 231 can be opened at the lower end of the first parallel tube 23, and the first parallel tube 23 is inserted into the connector 9 through the hole 231. A screw hole is opened on the locking member 10, and the outer wall of the first parallel tube 23 extends towards the locking member 10, and a screw hole is also opened on the extended part, so that the first parallel tube 23 and the locking member 10 can be fixedly connected by a screw passing through the screw holes of both.

[0056] In one specific embodiment, please refer to Figure 2 and Figure 8 The switching component 3 may include a baffle 31 and a rotating shaft 32 fitted with an elastic reset member 321. The rotating shaft 32 is disposed in the docking cavity 4. The baffle 31 is rotatably connected to the rotating shaft 32 and is connected to the elastic reset member 321. The baffle 31 is used to block the drain pipe 2 from the docking cavity 4 when rotated to a preset position, and to connect the drain pipe 2 to the docking cavity 4 when rotated away from the preset position. The elastic reset member 321 is used to drive the baffle 31 to rotate to the preset position.

[0057] For example, the resilient reset member 321 may be Figure 8 The torsion spring shown is sleeved on the rotating shaft 32, with one end of the torsion spring extending into the small hole of the baffle 31. Please refer to... Figure 2 A fixed seat 41 is provided on each of the two opposite side walls of the docking cavity 4, and the two ends of the rotating shaft 32 are each embedded in a fixed seat 41, thereby being fixed by the fixed seat 41.

[0058] In practical applications, the baffle 31 can rotate under the action of an external base station. When the docking cavity 4 docks with the external base station, the external base station rotates the baffle 31 away from the preset position, thereby connecting the docking cavity 4 with the drain pipe 2, and thus allowing the sewage in the tank 1 to be extracted. In some cases, an additional drive mechanism can also be provided to drive the baffle 31 to rotate; this utility model does not specifically limit this.

[0059] In one specific embodiment, the housing 1 is provided with a separator (not shown in the figure), a metal mesh 152, and a filter 16. The separator is connected to the inner wall of the housing 1, the metal mesh 152 is disposed on one side of the separator, and the filter 16 is disposed between the air outlet 11 and the separator.

[0060] In this embodiment, under the action of an external negative pressure device, external sewage and water vapor enter the tank 1 through the inlet 12. The sewage is stored in the tank 1, while the water vapor is finally discharged through the outlet 11. During this process, the water vapor undergoes multi-stage sedimentation under its own gravity, the separation action of the separator, and the condensation action of the metal mesh 152, improving the sewage recovery efficiency. In addition to the sedimentation effect, it is also filtered by the filter 16, thus ultimately being discharged as relatively clean gas, avoiding pollution to the external environment.

[0061] In some cases, the separator can be a cyclone separator. A cyclone separator can cause the incoming water vapor to rotate upwards at high speed, thereby causing small droplets in the water vapor to be thrown to the side wall of the separation unit under the action of centrifugal force, and then dripping downwards after converging, thus achieving water vapor separation.

[0062] The metal mesh 152 can be placed above the cyclone separator to further condense water molecules in the air.

[0063] In one specific embodiment, please refer to Figure 3 The separator may include a settling plate 151. The settling plate 151 is connected to the inner wall of the housing 1. A metal mesh 152 is disposed at the bottom of the settling plate 151. The settling plate 151 has multiple guide holes 1511. The air outlet 11 is connected to the inside of the housing 1 through the guide holes 1511. A filter 16 is disposed between the air outlet 11 and the guide holes 1511.

[0064] In actual use, under the action of the external negative pressure device, external sewage and water vapor will enter the housing 1 through the inlet 12. The sewage will be stored in the housing 1, while the water vapor will be discharged from the outlet 11 after passing through the guide hole 1511. During this process, since the metal mesh 152 is set at the bottom of the settling plate 151 and the filter 16 is set between the outlet 11 and the guide hole 1511, the water vapor will first pass through the metal mesh 152 and then through the guide hole 1511, thus forming liquid sewage due to the condensation and settling effect of the metal mesh 152. The remaining water vapor will be further filtered by the filter 16 as it transfers to the outlet 11 after passing through the guide hole 1511, and finally discharged as relatively clean gas, avoiding pollution to the external environment.

[0065] For example, filter 16 may be a filter screen, including but not limited to HEPA filter screen, polyester fiber screen, activated carbon fiber screen, etc.

[0066] In one specific embodiment, please refer to Figures 3 to 5The settling plate 151 has a snap-fit ​​member 1512 on its side wall, and the settling plate 151 is snap-fitted to the inner wall of the housing 1 through the snap-fit ​​member 1512. The top of the housing 1 has a through mounting groove 14, and a sealing cover plate 17 is detachably installed on the top of the mounting groove 14. The filter 16 is installed in the mounting groove 14, and the bottom of the filter 16 is supported by the settling plate 151. The air outlet 11 passes through the mounting groove 14 and the guide hole 1511 in sequence and then communicates with the interior of the housing 1.

[0067] The following is a specific example; please refer to it. Figure 3 and Figure 5 The settling plate 151 has a surrounding fence structure 1513 on its four sides. This fence structure 1513 extends upward and connects to the inner top wall of the housing 1, thereby forming a cavity 18. The upper end of the cavity 18 is connected to the lower end of the mounting groove 14, and the lower end of the cavity 18 is connected to the interior of the housing 1 through a guide hole 1511. The air outlet 11 is connected to the upper end of the mounting groove 14. Thus, in actual use, water vapor will sequentially pass through the guide hole 1511, the cavity 18, the mounting groove 14, and the air outlet 11, and finally be discharged to the outside.

[0068] In one specific embodiment, a protective cover 19 is also included on the top of the housing 1. One side of the protective cover 19 is rotatably connected to the housing 1, and the other side is detachably connected to the housing 1 by a snap-fit. When the protective cover 19 is snap-fitted to the housing 1, it covers the top of the housing 1 for protection. When the detachably connected side of the protective cover 19 is separated from the housing 1, the protective cover 19 can be rotated relative to the housing 1 to expose the top of the housing 1, allowing the operator to open the sealing cover 17 on the top of the housing 1 to replace the filter 16 in the mounting slot 14, making it convenient to use.

[0069] This utility model also provides a cleaning robot, including the sewage tank described in any of the above embodiments.

[0070] In some embodiments, the cleaning robot may be equipped with a negative pressure device and a water pumping pipe. The negative pressure device is connected to the air outlet 11 of the sewage tank to create negative pressure within the tank. One end of the water pumping pipe is connected to the water inlet 12 of the sewage tank, and the other end is connected to the outside, allowing external sewage to enter the sewage tank through the water inlet 12. Additionally, the cleaning robot has a notch at its bottom, corresponding to the docking cavity 4 of the sewage tank, through which an external base station connects to the docking cavity 4 of the sewage tank.

[0071] In summary, this utility model provides a sewage tank and a cleaning robot including the same. The sewage tank has a drain pipe with one end located in the lower region near the bottom of the tank, and the other end connected to a docking cavity after passing through the upper region. This design allows sewage to flow upwards from the drain pipe to the docking cavity. When the external base station is not operational, the sewage is less likely to overcome gravity and flow upwards, thus remaining at a lower position and making it difficult to reach the other end of the drain pipe. This prevents prolonged contact between the sewage and the outlet, reducing the likelihood of leakage. Furthermore, the switch design also blocks the connection between the drain pipe and the docking cavity, improving sealing and further reducing the possibility of leakage.

[0072] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this utility model.

[0073] Those skilled in the art will understand that the modules in the apparatus of the implementation scenario can be distributed within the apparatus of the implementation scenario as described, or they can be located in one or more apparatuses different from this implementation scenario, with corresponding changes. The modules of the above-described implementation scenario can be combined into one module, or they can be further divided into multiple sub-modules.

[0074] The serial numbers of the above-mentioned utility models are for descriptive purposes only and do not represent the superiority or inferiority of the implementation scenarios.

[0075] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sump tank characterized in that, Includes a housing, a drain pipe, and a switch assembly disposed within the housing; The side wall of the box is provided with an air outlet and a water inlet. The air outlet is used to connect to an external negative pressure device, and the water inlet is used to draw sewage from the outside into the box under the action of the negative pressure device. The enclosure is provided with a docking cavity for connecting to an external base station. The interior of the enclosure is divided into an adjacent upper region and a lower region. One end of the drain pipe is located in the lower region near the bottom of the enclosure. After passing through the upper region, the other end of the drain pipe is connected to the docking cavity. The switch is disposed in the docking cavity and is used to block or connect the drain pipe and the docking cavity.

2. A sewage tank according to claim 1, characterized in that, The ratio of the length of the upper region in the height direction of the box to the length of the lower region in the height direction of the box is a positive number less than 1.

3. A sewage tank according to claim 1, characterized in that, The drain pipe has an inverted "U" shape, and the top of the drain pipe is located in the upper region near the top wall of the box.

4. A sewage tank as claimed in claim 3, wherein, The drain pipe includes an adapter, a connecting pipe, and a first parallel pipe and a second parallel pipe that are parallel to each other. The outer wall of the first parallel tube is fixedly connected to the inner side wall of the box body. One end of the first parallel tube is close to the bottom of the box body, and the other end is connected to the adapter. One end of the second parallel tube is fixedly connected to the docking cavity, and the other end is connected to the adapter. The two ends of the connecting tube are respectively connected to the first parallel tube and the second parallel tube through the adapter, and the outer wall of the connecting tube abuts against the inner top wall of the box body.

5. A sewage tank according to claim 4, characterized in that, The adapter includes an annular ring and an annular boss disposed on the inner edge of the annular ring. The ends of the first parallel tube and the second parallel tube are connected to their respective annular rings. The annular boss is embedded in the connecting tube by the end of the connecting tube. And / or, a connector is provided on the inner bottom wall of the box, a locking member is provided on the inner side wall of the box, the lower end of the first parallel tube is inserted into the connector, and the outer wall of the first parallel tube is fixedly connected to the locking member.

6. A sewage tank according to claim 1, characterized in that, The switching element includes a baffle and a rotating shaft sleeved with an elastic reset element. The rotating shaft is disposed in the mating cavity. The baffle is rotatably connected to the rotating shaft and is connected to the elastic reset element. The baffle is used to block the drain pipe from the docking cavity when rotated to a preset position, and to connect the drain pipe from the docking cavity when rotated away from the preset position; The elastic reset element is used to drive the baffle to rotate to the preset position.

7. A sewage tank as claimed in claim 1, wherein, The housing is equipped with a separator, a metal mesh, and a filter. The separator is connected to the inner wall of the housing, the metal mesh is disposed on one side of the separator, and the filter is disposed between the air outlet and the separator.

8. A sewage tank according to claim 7, characterized in that, The separator includes a cyclone separator; And / or, the separator includes a settling plate with multiple guide holes, the air outlet is connected to the interior of the housing through the guide holes, and the filter is disposed between the air outlet and the guide holes.

9. A sewage tank according to claim 8, characterized in that, When the separator includes the settling plate, the side wall of the settling plate is provided with a fastening element, and the settling plate is fastened to the inner wall of the housing through the fastening element; the top of the housing is provided with a through mounting groove, and a sealing cover is detachably provided on the top of the mounting groove; the filter is disposed in the mounting groove, and the bottom of the filter is supported by the settling plate; the air outlet passes through the mounting groove and the guide hole in sequence and communicates with the interior of the housing; It also includes a protective cover on the top of the box, one side of which is rotatably connected to the box, and the other side is detachably connected to the box by means of a snap fastener.

10. A cleaning robot, characterized in that, Includes a sewage tank as described in any one of claims 1-9.

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