A surface cleaning apparatus

Abstract

The application discloses a surface cleaning device, comprising a machine body and a floor brush which are pivotally connected with each other, the floor brush comprising a suction port, the machine body being provided with a suction device and a dirty liquid tank, the dirty liquid tank comprising a tank body and a tank cover which are detachably connected, the suction device being capable of sucking dirty water at the suction port to the dirty liquid tank through a suction pipeline, the dirty liquid tank comprising a first cavity and a second cavity, the tank cover being provided with a ventilation cavity, the suction device being communicated with the second cavity through the ventilation cavity, the upper portion of a first partition plate being provided with a first communication port, the second cavity being provided with a suction passage, the inlet of the suction passage being connected with the first communication port, the outlet of the suction passage being arranged on a different plane from the inlet of the suction passage, and the airflow direction on one side of the inlet of the suction passage being different from the airflow direction on one side of the outlet of the suction passage. The suction passage inlet and the outlet are arranged on different planes, so that after the airflow enters the suction passage inlet from the first communication port, the airflow needs to change direction to flow to the outlet and enter the ventilation cavity, thereby reducing the probability of dirty liquid entering the ventilation cavity along with the airflow.

Description

Technical Field

[0001] This application belongs to the technical field of surface cleaning devices, and specifically relates to a surface cleaning device. Background Technology

[0002] Current surface cleaning devices, such as surface cleaning machines, typically clean the surface by rolling the cleaning components and spraying cleaning fluid onto it to aid in removing dirt. Then, a suction device draws the dirty fluid into the waste tank of the surface cleaning device.

[0003] However, in actual cleaning processes, for areas with limited vertical height, such as under tables, beds, and sofas, users need to tilt or even lie flat on the machine to allow the cleaning components to reach deep into low spaces. In this situation, the waste tank will tilt synchronously with the machine, even becoming nearly parallel to the ground, and the vertical height difference between the suction device and the waste tank will be significantly reduced, even approaching the same height. On the one hand, tilting the machine will cause the solid-liquid mixture in the waste tank to shake violently. On the other hand, with the suction device lowered, the shaking solid-liquid mixture and the mist-like waste carried by the airflow can easily break through the existing anti-backflow structure and enter the suction device. This may cause the suction fan to short-circuit or be worn by solid waste, not only shortening the lifespan of the surface cleaning device but also affecting the user experience due to cleaning interruptions. Especially when the machine is completely flat, the waste tank and the suction device are at almost the same height, significantly increasing the risk of waste backflow, which has become a key technical problem that urgently needs to be solved in the industry.

[0004] To alleviate the above problems, targeted improvement solutions have emerged in the prior art. For example, Chinese utility model patent application number 202422747469.3 discloses a design for a wastewater tank with a dual-chamber structure: the wastewater tank includes a first chamber and a second chamber that are interconnected. The first chamber is located above the second chamber. One end of the wastewater inlet pipe is connected to the suction port, and the other end extends upward from the second chamber into the first chamber. The first chamber and the second chamber are connected through a liquid inlet on the top wall of the second chamber. The top of the first chamber is provided with a ventilated chamber connected to a suction device, and a suction channel is configured to connect the suction device to the second chamber. Its solid-liquid separation relies solely on the filter screen and HEPA filter in the lid's containment chamber. That is, after the solid-liquid mixture enters from the suction port, it must first flow through the wastewater inlet pipe into the first chamber, and then flow into the second chamber through the liquid inlet. Finally, only the fine solid waste carried by the airflow is intercepted by the filter screen and HEPA filter at the rear. The design logic of this scheme is as follows: When the suction device is working, on the one hand, it draws gas from the first chamber through the ventilation chamber to create a negative pressure in the first chamber to draw in the solid-liquid mixture at the suction port; on the other hand, it draws gas from the second chamber through the suction channel to reduce the air pressure in the second chamber. By utilizing the pressure difference between the first and second chambers and the effect of gravity, the solid-liquid mixture in the first chamber is introduced into the second chamber for storage through the liquid inlet, thereby reducing the probability that the mixture in the first chamber will enter the suction device due to shaking.

[0005] The above solution reduces the probability of wastewater entering the machine body and contaminating the suction device, and its simple structure makes the wastewater tank easy to clean. However, the ventilation chamber of this solution is directly connected to either the first or second chamber, and the airflow enters the second chamber before entering the ventilation chamber. Since the second chamber is open and its lower part is relatively narrow, with the lower port of the suction channel located at the narrow point, the airflow in the second chamber compresses the liquid flow, inevitably causing local surges in the narrow part of the second chamber. Especially when the user pushes or pulls the machine body back and forth, the severe airflow compression can cause wastewater to accumulate and surge in a local area within the second chamber, or even splash. The tiny droplets generated during splashing, due to their light weight and separation from most of the wastewater, are more easily drawn into the lower port of the suction channel by the airflow and then into the ventilation chamber. Therefore, it still cannot prevent small droplets from being carried into the receiving cavity inside the lid, thus contaminating the HEPA filter. A damp HEPA filter will affect the smoothness of airflow, and poor airflow will affect the suction power of the suction device, resulting in a decrease in the dirt removal effect of the surface cleaning device. Utility Model Content

[0006] This application provides a surface cleaning device to solve the technical problem in traditional surface cleaning machines where the dirty liquid in the first chamber is easily sucked into the lid by the suction device after entering the second chamber, contaminating the HEPA filter, resulting in poor airflow and reduced suction power, which in turn affects the cleaning effect.

[0007] The technical solution adopted in this application is as follows: A surface cleaning device includes a body and a floor brush pivotally connected to each other. The floor brush includes a suction port. The body is equipped with a suction device and a wastewater tank. The wastewater tank includes a detachably connected tank body and a tank lid. The wastewater tank and the suction port are connected via a suction pipe. The suction device can suck wastewater from the suction port to the wastewater tank through the suction pipe. The wastewater tank includes a first cavity and a second cavity separated by a first partition plate. The tank lid has a venting cavity. The suction device is connected to the second cavity through the venting cavity. The upper part of the first partition plate has a first connecting port. The second cavity has a suction channel for connecting the venting cavity and the first connecting port. The inlet of the suction channel is connected to the first connecting port. The outlet of the suction channel is opposite to the inlet of the suction channel, so that the airflow direction on the inlet side of the suction channel is different from the airflow direction on the outlet side of the suction channel.

[0008] The surface cleaning device described in this application also includes the following additional technical features: The surface cleaning device further includes an air inlet chamber located at the lower part of the ventilation chamber and communicating with the ventilation chamber. The air inlet chamber has an air inlet located inside the second chamber. The height of the first connecting port is higher than the height of the air inlet. The first connecting port and the air inlet are connected through the suction channel.

[0009] The suction channel includes a first airflow channel connected to the first communication port, a second airflow channel connected to the air inlet, and a deflection channel connecting the first airflow channel and the second airflow channel. The airflow direction in the first airflow channel is opposite to the airflow direction in the second airflow channel, and the airflow direction in the deflection channel forms an angle with both the airflow direction in the first airflow channel and the airflow direction in the second airflow channel.

[0010] The second cavity has a second partition plate extending from the lid to the bottom wall of the barrel. The second partition plate is spaced apart from the first partition plate. The second partition plate, the first partition plate and the cavity wall of the second cavity cooperate to form a first airflow channel. The second partition plate and the cavity wall of the second cavity cooperate to form a second airflow channel. Above the second airflow channel, there is also a buffer cavity that connects the second airflow channel and the air inlet cavity respectively.

[0011] The buffer chamber is provided with multiple liquid-blocking baffles spaced apart along its extension direction, and the multiple liquid-blocking baffles are staggered to form a bent air extraction channel inside the buffer chamber.

[0012] The lower end of the buffer chamber is provided with a detachable solid-liquid separation structure, which includes a filter plate with mesh.

[0013] The air intake chamber is formed by a portion of the wall of the ventilation chamber extending downwards, and the lower opening of the air intake chamber extends into the second chamber and connects to the upper opening of the buffer chamber.

[0014] The first cavity is divided into a liquid storage sub-cavity and a surge sub-cavity by a solid-liquid separation plate. The upper port of the suction pipe is connected to the surge sub-cavity. The second cavity is connected to the liquid storage sub-cavity through a first connecting port.

[0015] The solid-liquid separation plate includes a first plate extending along the width direction of the barrel and a second plate extending along the height direction of the barrel. The first plate and the second plate are respectively provided with a plurality of filter holes, and the upper port of the suction pipe extending into the first cavity is located above the first plate.

[0016] The first partition includes an upper partition connected to the bucket lid and a lower partition connected to the bucket body. An elastic sealing element is provided between the upper partition and the lower partition. The bucket lid is connected to the bucket body, and the elastic sealing element abuts against the upper partition and the lower partition respectively.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows: This application divides the wastewater tank into a first chamber and a second chamber using a first partition plate, and only provides a first connecting port at the upper part of the first partition plate connecting the two chambers. When the suction device is working, it draws gas from the second chamber through the venting chamber to create a stable negative pressure. This negative pressure only exerts a suction effect on the first chamber through the first connecting port, ensuring that the wastewater from the suction port preferentially enters the first chamber and becomes the primary storage area. Only when the wastewater level in the first chamber rises to the height of the first connecting port, or when the machine body is tilted causing the liquid level to approach the connecting port, will a small amount of wastewater slowly flow into the second chamber, minimizing the amount of wastewater in the second chamber. This reduces the probability that excessive wastewater in the second chamber may enter the venting chamber due to machine shaking or other factors, causing contamination to the machine components, including the suction device.

[0018] Furthermore, due to the symmetrical design of the inlet and outlet of the suction channel, the airflow entering the suction channel from the first connecting port must change direction along this symmetrical path before flowing to the outlet and into the ventilation chamber. Miscellaneous liquids carried in the airflow, such as tiny droplets splashed up when the machine is tilted, have significant inertia and cannot follow the airflow to change direction; most of them will settle back into the second chamber and cannot enter the ventilation chamber with the airflow. The HEPA filter is located inside the ventilation chamber. This design directly and significantly reduces the probability of liquids contacting the HEPA filter, thereby reducing the probability of the HEPA filter losing its filtering capacity due to moisture and blockage. This prevents airflow obstruction caused by HEPA filter contamination, ensuring a stable suction force and guaranteeing effective waste removal.

[0019] Furthermore, the waste liquid tank design of this application is adaptable to various operating states of the surface cleaning device. When the waste liquid tank is upright, the waste liquid in the first chamber is concentrated at the bottom, with only a small amount flowing into the second chamber when the liquid level is high. The second chamber is always at a low liquid level, and the suction device mainly extracts gas, with almost no possibility of the HEPA filter coming into contact with the waste liquid. When the waste liquid tank is tilted or lying flat, the first connecting port is still located above the first partition plate. The waste liquid needs to reach a relatively high level after tilting before entering the second chamber. Even if a small amount of waste liquid enters, the non-directional design of the suction channel can still intercept most of the mist-like waste liquid, reducing the risk of HEPA filter contamination. This adaptability design can prevent HEPA filter failure in the long term, avoid the decrease in suction power caused by HEPA filter problems, and ensure that the surface cleaning device can maintain stable suction efficiency in different cleaning scenarios. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the surface cleaning device of this application in different positional states; Figure 2 This is a schematic diagram of the structure of the wastewater tank according to one embodiment of this application; Figure 3 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 1 ; Figure 4 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 2 ; Figure 5 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 3 ; Figure 6 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 4 ; Figure 7 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 5 ; Figure 8 This is a cross-sectional view of a wastewater tank according to one embodiment of this application. Figure 6 ; Figure 9 for Figure 8 Enlarged view of part A; Figure 10 This is a schematic diagram of the structure of the wastewater tank in one embodiment of this application.

[0021] List of components and reference numerals: 1. Fuselage; 2 floor brushes, 21 cleaning components; 3. Wastewater tank; 31. Tank lid; 311. Upper shell; 312. Lower shell; 313. Vent chamber; 33. Tank body; 331. First chamber; 3311. Liquid storage sub-chamber; 3312. Surge sub-chamber; 332. Second chamber; 34. Sewage suction pipe; 341. Sewage suction tube; 342. Connecting pipe; 3421. Sealing ring; 39. Solid-liquid separation plate; 391. First plate body; 392. Second plate body; 393. Filter hole; 5. First connecting port; 6 suction channel, 61 first airflow channel, 62 second airflow channel, 63 deflection channel; 7. Suction device; 8. Intake chamber, 81. Intake port, 82. First end, 83. Second end; 9 First partition plate, 91 Upper partition plate, 911 Sealing boss, 92 Lower partition plate; 10. Second partition plate; 110 buffer chamber, 1101 liquid-resistant baffle; 120 filter plate; 130 flexible seal; 140 HPa. Detailed Implementation

[0022] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0024] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0027] Surface cleaning devices include handheld cleaning machines such as floor scrubbers and vacuum cleaners, and self-propelled cleaning machines such as robotic vacuum cleaners and mopping robots. This first embodiment uses a floor scrubber as an example to illustrate the solution; however, those skilled in the art will understand that this solution can also be applied to any of the aforementioned surface cleaning devices.

[0028] As a surface cleaning device of this utility model, such as Figures 1 to 4 As shown, the device includes a water supply system, a vacuum system, a pivotally connected body 1 and a floor brush 2. In this embodiment, the body 1 has three working states: upright stop state, tilted working state, and flat working state, as shown below. Figure 1The diagram illustrates the machine body 1 in an inclined working state and a horizontal working state. The waste tank 3 also has two states, inclined and horizontal, following the machine body 1. The floor brush 2 is equipped with a suction port and a cleaning component 21. Above the suction port is a scraping component and a water supply port connected to the water supply system. The suction system includes a suction device 7, a waste tank 3, and a suction pipe 34 connecting the suction port and the waste tank 3. The suction port is located behind the cleaning component 21. The machine body 1 contains the suction device 7 and a battery pack. The waste tank 3 is located on the machine body 1 and has a suction pipe 341. In this embodiment, the suction pipe 341 is located inside the waste tank 3. In this embodiment, the suction device 7 is a vacuum motor. The cleaning component 21 includes a roller and a cleaning cloth covering the roller. The cleaning component 21 has bristles. The waste tank 3 is divided into a first chamber 331 and a second chamber 332. The waste tank 3 and the suction port are connected by suction. Pipeline 34 is connected, and suction device 7 can suck sewage from the suction port to sewage tank 3 through suction pipe 34. Sewage tank 3 includes a first cavity 331 and a second cavity 332 separated by a first partition plate 9. A venting cavity 313 is provided on the lid 31. Suction device 7 is connected to the second cavity 332 through venting cavity 313. A first connecting port 5 is provided on the upper part of the first partition plate 9. A suction channel 6 is provided in the second cavity 332 to connect venting cavity 313 and first connecting port 5. The inlet of suction channel 6 is connected to the first connecting port 5. The outlet of suction channel 6 is opposite to the inlet of suction channel 6 so that the airflow direction on the inlet side of suction channel 6 is different from the airflow direction on the outlet side of suction channel 6. When the surface cleaning machine is working, the water supply system supplies water through the water inlet to wet the cleaning cloth on the cleaning component 21. The cleaning component 21 rotates, and the cleaning cloth and its bristles continuously wipe the surface to be cleaned. The scraping component scrapes the dirt off the cleaning cloth and its bristles. The suction device 7 works to draw airflow from the second chamber 332, creating a negative pressure inside the dirt tank 3. The dirt is then sprayed out through the suction port and suction pipe 34 and falls into the first chamber 331. The tank cover 31 includes an upper shell 311 and a lower shell 312. The lower shell 312 has an upward opening. The upper shell 311 has a downwardly recessed receiving cavity in the middle. The HEPA filter 140 is placed in the receiving cavity. The upper shell 311 covers the lower shell 312. The recessed part matches the bottom wall of the lower shell 312 to form a ventilation cavity 313 that communicates with the receiving cavity.

[0029] This embodiment does not limit the structural form of the suction pipe 34. In one specific example, the suction pipe 34 consists of a suction pipe 341 and a connecting pipe 342. The suction pipe 341 is connected to the suction port, and one end of the connecting pipe 342 extends into the surge chamber 3312, while the other end is connected to the suction pipe 341, thus forming the suction pipe 34. A sealing ring 3421 is provided at the connection end between the connecting pipe 342 and the suction pipe 341. When the suction pipe 341 and the connecting pipe 342 are connected, the sealing ring 3421 is fitted onto the outer wall of the suction pipe 341. In another example, the suction pipe 34 consists of an independent pipe with one end connected to the suction port and the other end directly extending into the surge chamber 3312.

[0030] In this embodiment, the suction device 7 is installed inside the machine body 1, and the waste liquid tank 3 is installed at the rear of the machine body 1. The waste liquid tank 3 includes a lid 31 and a body 33. Figure 3 As shown, the upper end of the suction pipe 34 extends into the tank 33. The sewage tank 3 includes a first cavity 331 and a second cavity 332 separated by a first partition plate 9. The first cavity 331 is divided into a liquid storage sub-cavity 3311 and a surge sub-cavity 3312 that are interconnected by a solid-liquid separation plate 39. The upper end of the suction pipe 34 is connected to the surge sub-cavity 3312. The upper part of the first partition plate 9 is provided with a first connecting port 5 for connecting the liquid storage sub-cavity 3311 and the second cavity 332. The suction device 7 is connected to the second cavity 332.

[0031] Figure 3 , Figure 4 The diagram shows the airflow path within the wastewater tank 3. The dotted lines with arrows represent the airflow path. After the airflow in the suction pipe 34 is drawn into the surge chamber 3312, it sequentially passes through the surge chamber 3312 and the storage chamber 3311 before entering the second chamber 332 through the first connecting port 5.

[0032] The surface cleaning device of this embodiment includes a waste liquid tank 3. The tank body 33 of the waste liquid tank 3 is provided with a first cavity 331 and a second cavity 332 separated by a first partition plate 9. The first cavity 331 and the second cavity 332 are connected by a first connecting port 5 at the upper part of the first partition plate 9. The first cavity 331 is divided into a liquid storage sub-cavity 3311 and a surge sub-cavity 3312 that are interconnected by a solid-liquid separation plate 39. The upper port of the suction pipe 34 is connected to the surge sub-cavity 3312, and the suction device 7 is connected to the second cavity 332. The waste liquid tank 3 is divided into the first cavity 331 and the second cavity 332 by the first partition plate 9, and the first connecting port 5 connecting the two cavities is only provided at the upper part of the first partition plate 9. When the suction device 7 is working, it draws gas from the second cavity 332 through the venting chamber 313 to form a stable negative pressure. This negative pressure only produces a suction effect on the first cavity 331 through the first connecting port 5, ensuring that the waste liquid from the suction port preferentially enters the first cavity 331 and the first cavity 331 becomes the main storage area. Only when the level of the contaminated liquid in the first chamber 331 rises to the height of the first connecting port 5, or when the body 1 is tilted causing the liquid level to approach the connecting port, will a small amount of contaminated liquid slowly flow into the second chamber 332, minimizing the amount of contaminated liquid remaining in the second chamber 332. This reduces the probability that excessive contaminated liquid in the second chamber 332 may enter the ventilation chamber 313 due to shaking of the body 1 or other factors, causing contamination to the components of the body 1, including the suction device 7.

[0033] Furthermore, due to the symmetrical arrangement of the inlet and outlet of the suction channel 6, the airflow entering the suction channel 6 from the first connecting port 5 must change direction along the symmetrical path before flowing to the outlet and entering the ventilation chamber 313. Miscellaneous liquids carried in the airflow, such as tiny droplets splashed up when the machine body 1 is tilted, have significant inertia and cannot follow the airflow to change direction. Most of them will settle back into the second chamber 332 and cannot enter the ventilation chamber 313 with the airflow. The HEPA filter 140 is located within the ventilation chamber 313. This design directly and significantly reduces the probability of liquids contacting the HEPA filter 140, thereby reducing the probability of the HEPA filter 140 losing its filtering capacity due to moisture or blockage. This prevents airflow obstruction caused by HEPA filter 140 contamination, ensuring that the suction force of the suction device 7 remains stable and guaranteeing the suction effect.

[0034] Furthermore, the waste liquid tank 3 of this application is designed to adapt to various operating states of the surface cleaning device. When the waste liquid tank 3 is in an upright position, the waste liquid in the first chamber 331 is concentrated at the bottom, with only a small amount flowing into the second chamber 332 when the liquid level is high. The second chamber 332 is always at a low liquid level, and the suction device 7 mainly extracts gas, so the HEPA 140 has almost no chance of contacting the waste liquid. When the waste liquid tank 3 is in an inclined or flat position, the first connecting port 5 is still located above the first partition plate 9. The waste liquid needs to reach a relatively high position after the inclination before entering the second chamber 332. Even if a small amount of waste liquid enters, the opposite-plane deflection design of the suction channel 6 can still intercept most of the mist-like waste liquid, reducing the risk of contamination of the HEPA 140. This adaptability design can prevent the HEPA 140 from failing in the long term, avoid the decrease in suction power caused by HEPA 140 problems, and ensure that the surface cleaning device can maintain stable waste suction efficiency in different cleaning scenarios.

[0035] Specifically, in this embodiment, the first partition plate 9 extends vertically, and the first cavity 331 and the second cavity 332 are arranged side by side laterally. The volume of the first cavity 331 is larger than that of the second cavity 332, so that the first cavity 331 can hold more waste liquid, and the waste liquid in the first cavity 331 is less likely to enter the second cavity 332 through the first connecting port 5. The solid-liquid separation plate 39 is located above the first cavity 331, and the solid-liquid separation plate 39 is spaced apart from the cavity wall of the first cavity 331 to form a receiving groove. The surface cleaning device also includes a liquid level electrode partially located in the receiving groove. The liquid level electrode is used to detect the liquid level height in the first cavity 331. When the liquid level height in the first cavity 331 is higher than a preset value, the liquid level electrode will transmit a signal to the controller, and the controller will issue a warning signal.

[0036] As a preferred embodiment of this example, Figure 3 As shown, the surface cleaning device also includes an air inlet chamber 8 located at the lower part of the ventilation chamber 313 and connected to the ventilation chamber 313. The air inlet chamber 8 has an air inlet 81 located inside the second chamber 332. The height of the first connecting port 5 is higher than the height of the air inlet 81. The first connecting port 5 and the air inlet 81 are connected through a suction channel 6.

[0037] Specifically, the venting chamber 313 is located on the lid 31 and above the first chamber 331 and the second chamber 332. The HEPA filter 140 is located inside the venting chamber 313, filtering and separating the airflow through it, separating liquid or solid contaminants, and acting as the final barrier protecting the suction device 7. In this embodiment, the air intake chamber 88 is formed by a top plate, a bottom plate, and a side plate. The top plate has a first opening communicating with the venting chamber, and the bottom plate has a second opening communicating with the second chamber 332. That is, the air intake chamber 8 in this embodiment is generally square. Even if a small amount of contaminant follows the airflow through the second chamber 332 into the air intake chamber 8, it will fall onto the bottom plate of the air intake chamber 8 under gravity, and move due to the airflow and the shaking of the machine body, thus falling back into the second chamber 332 through the second opening.

[0038] The suction device 7 draws gas from the air intake chamber 8 through the ventilation chamber 313. The air intake chamber 8 then introduces airflow from the suction channel 6 through the air inlet 81. Since the first connecting port 5 is higher than the air inlet 81, if there is a small amount of dirty liquid inside the second chamber 332, it will accumulate in the area below the air inlet 81 under the action of gravity, and is unlikely to follow the airflow to the height of the air inlet 81. This physically prevents the dirty liquid from entering the air intake chamber 8 through the air inlet 81. Based on this, the design of the air intake chamber 8 can further optimize the flow path of the suction airflow. The air intake chamber 8 can concentrate and guide the airflow, so that the airflow flows steadily into the air intake chamber 8 from the suction channel 6, and then enters the ventilation chamber 313 in a directional manner. It will not diffuse disorderly in the second chamber 332, and will not disturb the dirty liquid at the bottom of the second chamber 332, reducing the probability that the dirty liquid at the bottom of the second chamber 332 will be entrained by the airflow. Meanwhile, the suction channel 6 connects the first connecting port 5 and the air inlet 81, which ensures that the airflow flows only along the path of the first connecting port 5, the suction channel 6, the air inlet 81, the air inlet chamber 8, and the ventilation chamber 313. This avoids the vortex phenomenon caused by the chaotic flow direction of the airflow in the second chamber 332, thereby preventing the vortex from easily stirring up the bottom dirt liquid and further reducing the probability of dirt liquid contacting the suction device 7.

[0039] Furthermore, when the body 1 is in an upright position, the small amount of contaminant in the second chamber 332 is concentrated at the bottom of the chamber, with a significant height difference from the air inlet 81, preventing the contaminant from contacting the air inlet 81. When the body 1 is in a lying position or at a large tilt angle, the contaminant in the second chamber 332 will accumulate at a lower position. Since the air inlet 81 is located inside the second chamber 332 and is lower than the first connecting port 5, the area where the contaminant accumulates is still lower than the air inlet 81, preventing it from easily overflowing into the air inlet 81. In this way, the purity of the airflow entering the ventilation chamber 313 can be improved, significantly reducing the risk of damage to the suction device 7 due to contact with contaminant or dirt, and ensuring the working stability of the surface cleaning device when cleaning in low spaces.

[0040] As a preferred example of this implementation, such as Figure 3As shown, the suction channel 6 includes a first airflow channel 61 connected to the first connecting port 5, a second airflow channel 62 connected to the air inlet 81, and a deflection channel 63 connecting the first airflow channel 61 and the second airflow channel 62. The airflow direction in the first airflow channel 61 is opposite to the airflow direction in the second airflow channel 62, and the airflow direction in the deflection channel 63 forms an angle with both the airflow direction in the first airflow channel 61 and the airflow direction in the second airflow channel 62.

[0041] Specifically, the first airflow channel 61 extends downwards vertically, and the first connecting port 5 is located at the top side of the first airflow channel 61. The second airflow channel 62 extends upwards vertically, and the deflecting channel 63 is located at the bottom of the first airflow channel 61 and the second airflow channel 62, connecting to the first airflow channel 61 and the second airflow channel 62 respectively, and forming a 90° angle with the first airflow channel 61 and the second airflow channel 62 respectively. It should be explained that the airflow direction in the first airflow channel 61 being opposite to the airflow direction in the second airflow channel 62, as stated in this solution, means that the first airflow channel 61 and the second airflow channel 62 extend in opposite directions to guide the airflow within them to move in opposite directions. The angle between the airflow directions in the two airflow channels is not 180°. In actual operation, the airflow in the first airflow channel 61 and the second airflow channel 62 may be deflected to some extent due to the shaking of the machine body 1 or the influence of contaminants in the airflow, but as long as the angle between the airflow directions in the first airflow channel 61 and the second airflow channel 62 is ≥90°, it is within the protection scope of this solution.

[0042] Airflow enters the first airflow channel 61 through the first connecting port 5, flows in a specific direction to the deflector channel 63, and after being turned by the deflector channel 63, flows into the second airflow channel 62 in the opposite direction, finally entering the intake chamber 8 through the air inlet 81. The airflow undergoes at least two turns in its path through the first airflow channel 61, the deflector channel 63, and the second airflow channel 62. During each turn, the entrained liquid in the airflow separates from the airflow due to inertia and settles inside the second chamber 332. Based on this, the reverse airflow direction and the angled deflector design achieve multiple liquid-blocking effects. Compared to the single-direction suction channel 6, the at least two turns provide double interception of the liquid. Even if a small amount of liquid passes through the first airflow channel 61, it will be separated within the deflector channel 63 and is unlikely to enter the second airflow channel 62. Simultaneously, the independent division of the first airflow channel 61 and the second airflow channel 62 avoids airflow turbulence within the channels, ensuring that the airflow flows in the preset direction and further reducing the possibility of airflow disturbing the liquid. In addition, when the body 1 is in a flat position, the dirty liquid in the second chamber 332 may flow along the chamber wall, but the angled structure of the baffle channel 63 can prevent the dirty liquid from entering the second airflow channel 62 with the airflow. Even if the dirty liquid comes into contact with the channel wall, it will settle at the turning point and will not be able to follow the airflow into the air inlet 81, effectively protecting the suction device 7.

[0043] As a preferred solution in this example, such as Figure 5 As shown, the second cavity 332 has a second partition plate 10 extending from the lid 31 to the bottom wall of the body 33. The second partition plate 10 is spaced apart from the first partition plate 9. The second partition plate 10, the first partition plate 9 and the cavity wall of the second cavity 332 cooperate to form a first airflow channel 61. The second partition plate 10 and the cavity wall of the second cavity 332 cooperate to form a second airflow channel 62. Above the second airflow channel 62, there is also a buffer cavity 110 that connects the second airflow channel 62 and the air inlet cavity 8 respectively.

[0044] Specifically, the first partition plate 9 and the second partition plate 10 are connected by a rear panel on the side opposite to the suction pipe 34. The first partition plate 9, the rear panel, the second partition plate 10, and the cavity wall of the second cavity 332 form a first airflow channel 61. The side of the first airflow channel 61 is sealed, the top end is connected to the first connecting port 5, and the bottom end is connected to the baffle channel 63. The second partition plate 10 extends vertically to separate the first airflow channel 61 and the second airflow channel 62 into two vertical channels. The top ends of both the first partition plate 9 and the second partition plate 10 are connected to the bucket lid 31. When the bucket lid 31 is pulled out from the bucket body 33, the first partition plate 9 and the second partition plate 10 are also pulled out simultaneously to facilitate cleaning of the components inside the first partition plate 9, the second partition plate 10, and the second cavity 332. The buffer chamber 110 is located at the bottom of the air intake chamber 8. The first chamber 331, the first connecting port 5, the suction channel 6, the buffer chamber 110, the air intake chamber 8, and the ventilation chamber 313 are connected in sequence. The buffer chamber 110 can buffer and filter the small amount of dirty liquid that enters the air intake chamber 8 with the airflow, reducing the probability of dirty liquid entering the air intake chamber 8.

[0045] The second partition plate 10 divides the internal space of the second cavity 332 into independent first airflow channel 61 and second airflow channel 62. After the airflow enters the first airflow channel 61 from the first connecting port 5, it can only flow along the path between the first partition plate 9 and the second partition plate 10, and will not diffuse disorderly in the second cavity 332, reducing the disturbance of the airflow to the small amount of dirty liquid at the bottom of the second cavity 332. After the airflow enters the second airflow channel 62 through the deflection channel 63, it flows into the buffer cavity 110 above. The buffer cavity 110 can decelerate and stabilize the airflow. The buffer chamber 110 further enhances the liquid blocking effect: after the airflow enters the buffer chamber 110, the speed decreases, and the residual fine liquid particles will settle in the buffer chamber 110 and will not directly enter the air intake chamber 8 with the airflow; in addition, when the body 1 is tilted, the second partition plate 10 can block the liquid from flowing laterally in the second chamber 332, reducing the probability of liquid rushing into the air intake chamber 8, while the buffer chamber 110 can block the liquid that may splash when tilted. With double protection, the probability of the suction device 7 coming into contact with the liquid is greatly reduced.

[0046] As a preferred approach under this scheme, such as Figure 6 As shown, multiple liquid-blocking baffles 1101 are spaced apart along the extension direction inside the buffer cavity 110. The multiple liquid-blocking baffles 1101 are staggered to form a bent air extraction channel inside the buffer cavity 110.

[0047] In this configuration, the buffer chamber 110 extends vertically, and liquid-blocking baffles 1101 are arranged sequentially and spaced along the opposite side walls of the buffer chamber 110, with the ends of the liquid-blocking baffles 1101 spaced apart from the other side wall of the buffer chamber 110. After the airflow enters the buffer chamber 110 from the second airflow channel 62, it needs to flow along the tortuous suction channel. Each time the airflow passes through the liquid-blocking baffles 1101, the airflow will impact the liquid-blocking baffles 1101, and the entrained contaminants will adhere to the surface of the liquid-blocking baffles 1101, and then drip back into the second chamber 332 under the action of gravity. The staggered liquid-blocking baffles 1101 form a multi-layer interception, so even if a small amount of contaminants passes through the previous liquid-blocking baffle 1101, it will be blocked by the next liquid-blocking baffle 1101 and cannot easily enter the air intake chamber 8. Furthermore, the spaced arrangement of the liquid-blocking baffles 1101 ensures sufficient flow space for airflow within the buffer chamber 110, preventing channel blockage and extending the residence time of the airflow within the buffer chamber 110, allowing the contaminated liquid more time to settle. The curved suction channel, compared to a straight channel, increases the number of contacts between the airflow and the liquid-blocking baffles 1101, improving liquid-blocking efficiency. For example, when airflow carrying mist-like contaminated liquid enters the buffer chamber 110, the mist-like contaminated liquid can be almost completely intercepted after passing through multiple staggered liquid-blocking baffles 1101. Additionally, when the unit 1 is in a flat position, the curved channel within the buffer chamber 110 prevents contaminated liquid from splashing into the air intake chamber 8 due to shaking. When contaminated liquid splashes, it is blocked by the liquid-blocking baffles 1101 and cannot enter the air intake 81 in a straight line, further reducing the risk of the suction device 7 being damaged by contaminated liquid.

[0048] As another preferred approach under this scheme, such as Figure 7 As shown, the lower end of the buffer chamber is provided with a detachable solid-liquid separation structure, which includes a filter plate 120 with mesh.

[0049] Before entering the bend in the buffer chamber 110, the airflow must pass through the filter plate 120 to further filter out solid contaminants in the second airflow channel 62, reducing the probability of solid contaminants passing through the inlet chamber 8 and the venting chamber 313 and entering the suction device 7. At the same time, the filter plate 120 can also filter residual liquid in the airflow. The liquid that gathers into droplets on the surface of the filter plate 120 will drip back into the second chamber 332 under its own gravity.

[0050] Specifically, the buffer chamber 110 is surrounded by a surrounding plate extending into the second chamber 332. The filter plate 120 is detachably connected to the bottom end of the surrounding plate by means of snap-fit ​​or bolt connection, which makes it easy to disassemble the filter plate 120 for cleaning, and also makes it easy to clean the cavity wall inside the buffer chamber 110 and the liquid blocking baffle 1101.

[0051] As another preferred option under this scheme, such as Figure 8As shown, the air intake chamber 8 is formed by a portion of the cavity wall of the ventilation chamber 313 extending downwards. The lower opening of the air intake chamber 8 extends into the second cavity 332 and connects to the upper opening of the buffer cavity 110.

[0052] The air intake chamber 8, enclosed by the walls of the ventilation chamber 313, allows airflow to flow only within the chamber wall structure, preventing leakage to other areas of the second chamber 332. This ensures that airflow enters the ventilation chamber 313 directly from the buffer chamber 110 via the air intake chamber 8, avoiding airflow leakage that could lead to unstable negative pressure in the second chamber 332. Unstable negative pressure can easily cause backflow of waste liquid, while the sealed air intake chamber 8 maintains a stable negative pressure environment, ensuring efficient waste suction. Simultaneously, the direct connection between the buffer chamber 110 and the second chamber 332 via the ventilation chamber 313 shortens the airflow path, reducing the probability of waste liquid being carried along during airflow. After entering the air intake chamber 8 from the buffer chamber 110, the airflow quickly flows to the ventilation chamber 313 without stagnating within the air intake chamber 8. As a preferred embodiment of this application, such as Figures 3 to 8 As shown, the first cavity 331 is divided into a liquid storage sub-cavity 3311 and a surge sub-cavity 3312 that are interconnected by the solid-liquid separation plate 39. The upper port of the suction pipe 34 is connected to the surge sub-cavity 3312. The second cavity 332 is connected to the liquid storage sub-cavity 3311 through the first connecting port 5.

[0053] The sewage from the suction port first enters the surge chamber 3312 through the suction pipe 34. The surge chamber 3312 can directly serve as an initial buffer zone for the sewage. Even if a large amount of sewage rushes in in a short period of time, it can be temporarily stored in the surge chamber 3312 to prevent the sewage from directly impacting other areas of the first chamber 331 and causing violent shaking. This reduces the probability of sewage accumulating and splashing into the second chamber 332 from the source. At the same time, the solid-liquid separation plate 39 can also perform initial solid-liquid separation on the sewage in the surge chamber 3312, intercepting solid dirt such as hair and debris in the sewage. These dirt will be confined within the surge chamber 3312 and will not flow with the liquid to the storage chamber 3311, nor will they enter the second chamber 332 through the first connecting port 5. On the one hand, it avoids the problem of large solid waste flowing with the sewage to the connection port and causing blockage, ensuring that the flow path between the liquid storage sub-cavity 3311 and the second cavity 332 is always unobstructed; on the other hand, it eliminates the possibility of large solid waste entering the second cavity 332 and coming into contact with the suction device 7, thereby avoiding the risk of large solid waste scratching the components of the suction device 7 and blocking the airflow channel, which helps to extend the service life of the suction device 7.

[0054] Meanwhile, the liquid storage sub-cavity 3311, as the main liquid storage area of ​​the first cavity 331, works with the surge sub-cavity 3312 to achieve liquid storage and buffering functions. After solid-liquid separation, the liquid flows from the surge sub-cavity 3312 to the liquid storage sub-cavity 3311. The volume of the liquid storage sub-cavity 3311 can meet the liquid storage needs of most cleaning scenarios. Only when the liquid level in the liquid storage sub-cavity 3311 rises to the height of the first connecting port 5, or when the body 1 is tilted and the liquid level is close to the first connecting port 5, will a small amount of liquid slowly flow into the second cavity 332 through the first connecting port 5, further reducing the amount of liquid in the second cavity 332 and reducing the probability of the suction device 7 coming into contact with the liquid.

[0055] Furthermore, when the machine body 1 is in an upright position, the waste liquid in the storage sub-cavity 3311 is concentrated at the bottom of the chamber under the influence of gravity, and the liquid level needs to continuously rise to approach the first connecting port 5. Solid waste is intercepted by the solid-liquid separation plate 39 and remains in the surge sub-cavity 3312, without clogging the first connecting port 5 with the liquid sedimentation. When the machine body 1 is in a flat position or at a large tilt angle, the waste liquid tank 3 tilts synchronously with the machine body 1, and the solid-liquid separation plate 39 can still confine large-volume solid waste in the surge sub-cavity 3312, preventing it from sliding and scratching the cavity wall or blocking the channel in the first cavity 331. At the same time, the buffering effect of the surge sub-cavity 3312 can reduce the amplitude of waste liquid sloshing when the machine body 1 is pushed and pulled, reducing the probability of waste liquid rushing into the second cavity 332 in large quantities through the first connecting port 5 due to violent sloshing. The storage sub-cavity 3311 can stably store liquid, ensuring that the waste liquid in the first cavity 331 is always within a controllable range, further ensuring the working stability of the suction device 7. It needs to be explained that the solid-liquid separation plate 39 can filter and intercept at least some of the solid contaminants in the sewage. For small solid contaminants in the sewage, there is still a certain probability that they can pass through the solid-liquid separation plate 39 and enter the liquid storage sub-cavity 3311. However, these solid contaminants are small in size and have a low probability of blocking the first connecting port 5. The first connecting port 5 can still ensure smooth airflow.

[0056] As a preferred embodiment of this implementation, such as Figure 10 As shown, the solid-liquid separation plate 39 includes a first plate 391 extending along the width direction of the barrel 33 and a second plate 392 extending along the height direction of the barrel 33. The first plate 391 and the second plate 392 are respectively provided with a plurality of filter holes 393. The upper port of the suction pipe 34 extending into the first cavity 331 is located above the first plate 391.

[0057] When the body 1 is in an upright position, the sewage introduced by the suction pipe 341 first falls on the top of the first plate 391. The liquid flows through the filter hole 393 of the first plate 391 to the lower liquid storage chamber 3311, while solid dirt such as hair and debris is intercepted by the first plate 391. When the body 1 is in an inclined or lying position, more sewage entering the surge chamber 3312 from the upper port of the suction pipe 34 will drip onto the second plate 392 under the action of gravity. After being filtered through the filter hole 393 on the second plate 392, the liquid flows into the liquid storage chamber 3311, while solid dirt remains in the surge chamber 3312. The solid-liquid separation plate 39 is configured to include a first plate 391 and a second plate 392, both of which can perform solid-liquid separation and filtration. This ensures that the sewage entering the surge chamber 3312 through the suction pipe 34 can be quickly and effectively separated, regardless of whether the machine body 1 is upright, tilted, or lying flat. This prevents the sewage from accumulating in the surge chamber 3312 due to untimely filtration, thus avoiding backflow into the suction pipe 34 caused by sewage accumulation and ensuring the working stability of the surface cleaning device.

[0058] As a preferred embodiment of this example, Figure 8 , Figure 9 As shown, the first partition plate 9 includes an upper partition plate 91 connected to the barrel lid 31 and a lower partition plate 92 connected to the barrel body 33. An elastic sealing element 130 is provided between the upper partition plate 91 and the lower partition plate 92. The barrel lid 31 is connected to the barrel body 33, and the elastic sealing element 130 abuts against the upper partition plate 91 and the lower partition plate 92 respectively.

[0059] The elastic seal 130 seals the gap between the upper partition 91 and the lower partition 92, preventing sewage from the first chamber 331 from leaking into the second chamber 332. If there is a gap between the upper partition 91 and the lower partition 92, sewage in the first chamber 331 may leak into the second chamber 332, increasing the amount of sewage in the second chamber 332 and thus increasing the risk of damage to the suction device 7. At the same time, the seal prevents the negative pressure in the second chamber 332 from leaking through the gap, ensuring that the negative pressure is stably transmitted to the first chamber 331, guaranteeing the sewage suction efficiency and sewage diversion effect. In addition, the abutment seal of the elastic seal 130 can adapt to the installation error of the lid 31 and the body 33. The lid 31 and the body 33 are detachably connected. After multiple disassemblies, an installation gap may appear between the upper partition 91 and the lower partition 92. The elastic seal 130 can fill the gap through its own deformation, always maintaining a good sealing effect and avoiding seal failure due to installation errors. In addition, when the body 1 is tilted or lying flat, the sewage in the first chamber 331 will exert a certain pressure on the first partition plate 9. The elastic seal 130 can further fit the upper and lower partition plates 92 under pressure, improve the sealing performance, and prevent sewage leakage. Compared with the rigid sealing structure, the elastic seal 130 is more durable and can maintain the sealing effect after long-term use, ensuring that the first chamber 331 and the second chamber 332 work independently, reducing the amount of sewage in the second chamber 332, and protecting the suction device 7 from damage.

[0060] Preferably, such as Figure 9 As shown, the upper partition 91 has a sealing boss 911 on one side facing the first cavity 331. The bottom of the sealing boss 911 has a sealing groove with a width slightly larger than the thickness of the lower partition 92. The elastic sealing element 130 is installed in the sealing groove. When the barrel cover 31 is installed on the barrel body 33, the top of the second vertical plate abuts against the elastic sealing element 130 to seal.

[0061] This application does not limit the structural form of the first partition plate. In another embodiment, the first partition plate is installed on the bucket lid, and the elastic seal is installed on the end of the first partition plate away from the bucket lid. When the bucket lid is installed on the bucket body, the elastic seal abuts against the bottom wall of the second cavity for sealing. That is, in this embodiment, the first partition plate is an integral structure installed on the bucket lid, and is not composed of an upper partition plate and a lower partition plate as in Embodiment 1.

[0062] This application does not limit the structural form of the suction channel. In another embodiment, at least one secondary partition plate is provided in the second cavity. Secondary airflow channels are formed between the secondary partition plate and the second partition plate, and between adjacent secondary partition plates. The second airflow channel and the secondary airflow channel, and between adjacent secondary airflow channels, are connected by a baffle channel. The first airflow channel, the baffle channel, the second airflow channel, and the secondary airflow channel together form a bent suction channel. The number of secondary airflow channels depends on the lateral space of the second cavity. It can be understood that the more secondary airflow channels there are, the more bends the airflow makes when moving in the second cavity. The sewage is more likely to be deposited on the bottom wall of the second cavity during the continuous bends, thereby reducing the probability of sewage flowing back into the ventilation cavity from the second cavity.

[0063] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0064] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0065] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A surface cleaning device, comprising a body and a floor brush pivotally connected to each other, the floor brush including a suction port, the body being provided with a suction device and a wastewater tank, the wastewater tank including a detachably connected tank body and a tank lid, the wastewater tank and the suction port being connected via a suction pipe, the suction device being capable of suctioning wastewater from the suction port to the wastewater tank through the suction pipe, characterized in that... The waste tank includes a first chamber and a second chamber separated by a first partition plate. The tank lid is provided with a venting chamber. The suction device communicates with the second chamber through the venting chamber. The upper part of the first partition plate is provided with a first connecting port. The second chamber is provided with a suction channel for communicating with the venting chamber and the first connecting port. The inlet of the suction channel is connected to the first connecting port. The outlet of the suction channel is arranged opposite to the inlet of the suction channel, so that the airflow direction on the inlet side of the suction channel is different from the airflow direction on the outlet side of the suction channel.

2. The surface cleaning device according to claim 1, characterized in that, The surface cleaning device further includes an air inlet chamber located at the lower part of the ventilation chamber and communicating with the ventilation chamber. The air inlet chamber has an air inlet located inside the second chamber. The height of the first connecting port is higher than the height of the air inlet. The first connecting port and the air inlet are connected through the suction channel.

3. The surface cleaning device according to claim 2, characterized in that, The suction channel includes a first airflow channel connected to the first communication port, a second airflow channel connected to the air inlet, and a deflection channel connecting the first airflow channel and the second airflow channel. The airflow direction in the first airflow channel is opposite to the airflow direction in the second airflow channel, and the airflow direction in the deflection channel forms an angle with both the airflow direction in the first airflow channel and the airflow direction in the second airflow channel.

4. The surface cleaning device according to claim 3, characterized in that, The second cavity has a second partition plate extending from the lid to the bottom wall of the barrel. The second partition plate is spaced apart from the first partition plate. The second partition plate, the first partition plate and the cavity wall of the second cavity cooperate to form a first airflow channel. The second partition plate and the cavity wall of the second cavity cooperate to form a second airflow channel. Above the second airflow channel, there is also a buffer cavity that connects the second airflow channel and the air inlet cavity respectively.

5. The surface cleaning device according to claim 4, characterized in that, The buffer chamber is provided with multiple liquid-blocking baffles spaced apart along its extension direction, and the multiple liquid-blocking baffles are staggered to form a bent air extraction channel inside the buffer chamber.

6. The surface cleaning device according to claim 4, characterized in that, The lower end of the buffer chamber is provided with a detachable solid-liquid separation structure, which includes a filter plate with mesh.

7. The surface cleaning device according to claim 4, characterized in that, The air intake chamber is formed by a portion of the wall of the ventilation chamber extending downwards, and the lower opening of the air intake chamber extends into the second chamber and connects to the upper opening of the buffer chamber.

8. The surface cleaning device according to claim 1, characterized in that, The first cavity is divided into a liquid storage sub-cavity and a surge sub-cavity by a solid-liquid separation plate. The upper port of the suction pipe is connected to the surge sub-cavity. The second cavity is connected to the liquid storage sub-cavity through the first connecting port.

9. The surface cleaning device according to claim 8, characterized in that, The solid-liquid separation plate includes a first plate extending along the width direction of the barrel and a second plate extending along the height direction of the barrel. The first plate and the second plate are respectively provided with a plurality of filter holes, and the upper port of the suction pipe extending into the first cavity is located above the first plate.

10. The surface cleaning device according to claim 1, characterized in that, The first partition includes an upper partition connected to the bucket lid and a lower partition connected to the bucket body. An elastic sealing element is provided between the upper partition and the lower partition. The bucket lid is connected to the bucket body, and the elastic sealing element abuts against the upper partition and the lower partition respectively.

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