Liquid recovery system and surface cleaning equipment

Abstract

The invention provides a liquid recovery system and surface cleaning equipment. The liquid recovery system comprises a suction source, a suction nozzle, a recovery tank container and a filter, the filter is detachably mounted in the recovery tank container; the filter comprises a top wall, a bottom wall and a side wall connected with the top wall and the bottom wall, the side walls comprise a first side wall and a second side wall which are provided with drainage holes; the filter comprises a first filter cavity and a second filter cavity, the first filter cavity and the second filter cavity are both located on the gas channel in the recovery chamber, and the second filter cavity is located at the downstream of the first filter cavity; the first filtering cavity is formed by a top wall, a bottom wall, a first side wall and the inner wall of the recycling tank container; the second filtering cavity is formed by the top wall, the bottom wall, the first side wall, the second side wall and the inner wall of the recycling tank container, and the first filtering cavity and the second filtering cavity are in fluid communication through a drainage hole in the first side wall.

Description

Technical Field

[0001] The present disclosure relates to a liquid recovery system and a surface cleaning device. Background Art

[0002] A floor scrubber is a cleaning device suitable for household use, mainly used for cleaning and washing household floor surfaces.

[0003] The floor scrubber can automatically spray water and scrub the floor, and then suck the sewage and residual dirt into the machine's sewage tank. The floor scrubber is easy to use and can provide a thorough cleaning effect. The floor scrubber can self-clean at the base station, and all the user needs to do is empty the sewage tank and clean it. Therefore, whether the sewage tank itself is easy to clean has also become a key factor affecting the user experience.

[0004] In the prior art, floor scrubbers use separation baskets to separate solids from liquids. However, the areas where the separation baskets store solid waste are often in a closed or semi-closed state, making it difficult to clean the solid waste therein. Summary of the invention

[0005] The present disclosure provides a liquid recovery system and a surface cleaning device.

[0006] According to one aspect of the present disclosure, there is provided a liquid recovery system, comprising: Suction source; a suction nozzle disposed on a cleaning head in fluid communication with a suction source; a recovery tank container including a hollow riser forming an inlet flow passage to a recovery chamber defined within the recovery tank container; and A filter, wherein the filter is detachably mounted in the recovery tank container; wherein the filter comprises: a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall; the side wall comprises a first side wall and a second side wall having drainage holes; the filter comprises a first filter cavity and a second filter cavity, wherein the first filter cavity and the second filter cavity are both located on the gas channel in the recovery chamber, and the second filter cavity is located downstream of the first filter cavity; Wherein, the first filter chamber is formed by the top wall, the bottom wall, the first side wall and the inner wall of the recovery tank container; the second filter chamber is formed by the top wall, the bottom wall, the first side wall, the second side wall and the inner wall of the recovery tank container, and the first filter chamber and the second filter chamber are fluidically connected through the drainage hole on the first side wall.

[0007] According to the liquid recovery system of at least one embodiment of the present disclosure, the outlet of the hollow standpipe is located in the first filter cavity.

[0008] According to the liquid recovery system of at least one embodiment of the present disclosure, the outlet of the hollow vertical pipe faces the rear wall of the first filter cavity of the filter.

[0009] According to the liquid recovery system of at least one embodiment of the present disclosure, the first side wall and the second side wall have a common edge, and the first side wall and the second side wall form an angle of 30-90°.

[0010] According to the liquid recovery system of at least one embodiment of the present disclosure, the side wall further includes a closed third side wall, and the third side wall, the second side wall, and the bottom wall form a first airflow duct.

[0011] According to the liquid recovery system of at least one embodiment of the present disclosure, the top wall has a first opening, and the first opening is in fluid communication with the first air flow duct.

[0012] According to the liquid recovery system of at least one embodiment of the present disclosure, the top wall has a second opening, and the second opening is in fluid communication with the second filter cavity.

[0013] According to the liquid recovery system of at least one embodiment of the present disclosure, the first opening is adjacent to the second opening and is spaced apart by the second sidewall.

[0014] According to the liquid recovery system of at least one embodiment of the present disclosure, a guide cover is provided on the top wall, and the guide cover covers the first opening and the second opening; the guide cover has a fluid guide port, and the direction of the fluid guide port is substantially opposite to the direction of the outlet of the hollow riser.

[0015] According to another aspect of the present disclosure, there is provided a surface cleaning device comprising: Upright body; a cleaning head mounted on the upright body, the cleaning head being movable over the surface to be cleaned, the upright body being operable in a manner substantially parallel to the surface to be cleaned during operation of the surface cleaning apparatus; A liquid supply tank assembly, the liquid supply tank assembly being disposed on the upright body or the cleaning head and being used for providing cleaning liquid to the cleaning head; a fluid distributor mounted on the cleaning head, wherein the fluid distributor is in fluid communication with the liquid supply tank assembly to provide the cleaning liquid in the liquid supply tank assembly to the cleaning head; and The above-mentioned liquid recovery system is at least used to recover and store the cleaning liquid after cleaning the surface to be cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0017] Figure 1 is a schematic structural diagram of a surface cleaning device according to an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic structural diagram of a cleaning head according to one embodiment of the present disclosure.

[0019] Figure 3 It is a schematic diagram of the assembly state of a recovery tank container and a filter according to one embodiment of the present disclosure.

[0020] Figure 4 is a schematic structural diagram of a recovery tank container according to one embodiment of the present disclosure.

[0021] Figure 5 is a schematic structural diagram of a filter according to one embodiment of the present disclosure.

[0022] Figure 6 It is a schematic structural diagram of a filter from another angle according to an embodiment of the present disclosure.

[0023] Figure 7 It is a structural schematic diagram of a part of the structure of a filter according to one embodiment of the present disclosure.

[0024] The specific reference numerals in the figure are: 100 handle part 200 Main body 300 Fluid Supply Tank Assembly 400 Recycling Tank Container 410 Cabinet 420 Hollow Standpipe 500 Connection 600 Cleaning Head 610 Roller Brush 620 nozzle 800 Filters 810 Top wall 811 First Opening 812 Second Opening 820 bottom wall 830 First side wall 840 Second side wall 850 First filter chamber 860 Second filter chamber 870 Third side wall 880 Guide cover 881 Fluid guide port 890 rear wall. DETAILED DESCRIPTION

[0025] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0028] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0029] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0030] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0031] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0032] Figure 1 is a schematic structural diagram of a surface cleaning device according to an embodiment of the present disclosure. Figure 2 It is a schematic structural diagram of a cleaning head according to one embodiment of the present disclosure.

[0033] The surface cleaning device of the present disclosure is configured to perform wet cleaning on a surface to be cleaned, wherein the surface to be cleaned may be a floor surface, preferably a household floor surface. At the same time, after the surface cleaning device performs wet cleaning on the floor surface, dirt and liquid (sewage) after cleaning the surface to be cleaned can be recovered to the surface cleaning device.

[0034] The surface cleaning device of the present disclosure may include an upright body. Specifically, the upright body of the present disclosure may include a handle portion 100 and a main body portion 200; wherein the handle portion 100 is detachably arranged on the main body portion 200, and the user can operate the surface cleaning device by operating the handle portion 100, and enable the upright body to operate in a manner substantially parallel to the surface to be cleaned during the operation of the surface cleaning device.

[0035] A user interaction button may be provided on the handle portion 100, and the user may control the surface cleaning device by triggering the user interaction button, such as controlling the start and stop of the surface cleaning device, and controlling the liquid supply speed of the surface cleaning device and the suction power of the suction source.

[0036] The main body 200 is pivotally connected to the cleaning head 600 via the connecting portion 500 ; therefore, when the user operates the handle portion 100 , the cleaning head 600 can be moved on the surface to be cleaned, and the surface to be cleaned can be cleaned by the cleaning head 600 .

[0037] In one example, the connection portion 500 may include a universal joint so that the main body 200 can rotate in two directions relative to the cleaning head 600. In another example, the connection portion 500 may include a multi-axis joint that can couple the main body 200 with the cleaning head 600 to allow the main body 200 to rotate relative to the cleaning head 600 along the first direction and the second direction.

[0038] The main body 200 can be pivoted to an upright position (also referred to as a storage position) through the connection portion 500, in which the angle between the main body 200 and the surface (or the ground on which the cleaning head 600 is placed) is 80° to 90°, preferably about 80°. In this position, the surface cleaning device is in a self-supporting posture (also referred to as an upright posture), that is, the main body 200 can be supported by the cleaning head 600, and the upright posture can be achieved without the aid of other objects.

[0039] The main body 200 can also accommodate components such as the liquid supply box assembly 300 and the recovery tank container 400. In the present disclosure, the liquid supply box assembly 300 can be detachably mounted to the side of the main body 200, and the mounting position can be located at the front side of the main body 200. The recovery tank container 400 can be detachably mounted to the side of the main body 200, and the mounting position can be located at the rear side of the main body. In another embodiment, the liquid supply box assembly 300 of the present disclosure can also be set on the cleaning head 600.

[0040] In one example, the thickness of the recovery tank container 400 is set to be smaller than the width, and the height of the liquid supply box assembly 300 is set to be smaller than the width, so that sufficient capacity can be ensured and the overall height of the surface cleaning equipment can be less than a predetermined height, such as 120 mm, after the main body 200 is laid flat.

[0041] The liquid supply box assembly 300 is used to store the cleaning liquid to be distributed. Accordingly, the liquid supply box assembly 300 can be connected to a fluid dispenser and fluidly connected (not shown in the figure), so that the cleaning liquid in the liquid supply box assembly 300 can be pressurized by the fluid dispenser and provided to the cleaning head 600, or provided to the surface to be cleaned near the cleaning head 600, thereby enabling wet cleaning of the surface to be cleaned to be achieved by the cleaning liquid.

[0042] In one example, the fluid dispenser may include a liquid supply pump that can draw cleaning liquid from the liquid supply tank assembly 300, pressurize the cleaning liquid, and provide it to the liquid outlet component, and then provide the pressurized cleaning liquid to the roller brush 610 of the cleaning head 600 or to the surface to be cleaned near the roller brush 610 through the liquid outlet component.

[0043] In the present disclosure, the cleaning liquid can be one or more of any suitable liquids, including but not limited to cleaning water, concentrated detergent, diluted detergent, or mixtures thereof, etc. In addition, the cleaning liquid can be a room temperature cleaning liquid or a high temperature cleaning liquid.

[0044] The main body 200 is formed with a accommodating space, and the recovery tank container 400 is detachably arranged on the main body 200 and is located in the accommodating space, so that when the liquid stored in the recovery tank container 400 is large, the user can remove the recovery tank container 400, pour out the sewage inside and clean up the solid garbage. At this time, part of the outer surface of the recovery tank container 400 forms part of the outer surface of the surface cleaning device.

[0045] like Figure 2 As shown, the cleaning head 600 of the present disclosure may include a roller brush 610 and a suction nozzle 620; wherein the suction nozzle 620 is located behind the roller brush 610, thereby, the used cleaning liquid and dirt can enter the recovery pipeline through the suction nozzle 620 and further flow to the recovery tank container 400.

[0046] Based on the above structure, in the surface cleaning device of the present disclosure, a liquid recovery system can be formed with the recovery tank container 400 as the center.

[0047] Specifically, the liquid recovery system of the present disclosure may include components such as a suction source, a suction nozzle, a recovery tank container 400 and a filter 800 .

[0048] The suction source of the present disclosure may be an electric suction source, which can generate negative pressure when working, and the negative pressure can be applied to the recovery tank container 400. Further, the negative pressure can be provided to the suction nozzle 620 via the hollow standpipe 420 and the recovery pipe. In other words, the suction nozzle 620 of the present disclosure can be in fluid communication with the suction source.

[0049] Figure 3 It is a schematic diagram of the assembly state of a recovery tank container and a filter according to one embodiment of the present disclosure. Figure 4 is a schematic structural diagram of a recovery tank container according to one embodiment of the present disclosure.

[0050] like Figure 3 and Figure 4 As shown, the recovery tank container 400 of the present disclosure includes a box body 410 and a hollow standpipe 420, wherein the hollow standpipe 420 forms an inlet flow passage leading to a recovery chamber defined in the recovery tank container 400; in a preferred embodiment, the box body 410 can be integrally formed with the hollow standpipe 420.

[0051] The hollow riser 420 of the present disclosure has an inlet and an outlet. Figure 4 In the direction shown, the lower end of the hollow vertical pipe 420 is formed as an inlet, and correspondingly, the upper end of the hollow vertical pipe 420 is formed as an outlet. The inlet of the hollow vertical pipe 420 is communicated with the suction nozzle 620 through a recovery pipe.

[0052] Figure 5 is a schematic structural diagram of a filter according to one embodiment of the present disclosure. Figure 6 It is a schematic structural diagram of a filter from another angle according to an embodiment of the present disclosure. Figure 7 It is a structural schematic diagram of a part of the structure of a filter according to one embodiment of the present disclosure.

[0053] like Figures 3 to 7 As shown, the filter 800 of the present disclosure is detachably installed in the recovery tank container 400; wherein the filter 800 includes: a top wall 810, a bottom wall 820 and a side wall connecting the top wall 810 and the bottom wall 820; the side wall includes a first side wall 830 with a drainage hole and a second side wall 840 with a drainage hole; the filter 800 includes a first filter chamber 850 and a second filter chamber 860, the first filter chamber 850 and the second filter chamber 860 are both located on the gas channel in the recovery chamber, and the second filter chamber 860 is located downstream of the first filter chamber 850.

[0054] That is, when the mixture of gas, liquid and solid waste flows out of the hollow riser 420, it will first flow to the first filter chamber 850, which can filter the solid waste in the mixture, and at least a portion of the filtered mixture will flow to the second filter chamber 860, which can filter the solid waste in the mixture.

[0055] Accordingly, the outlet of the hollow standpipe 420 of the present disclosure is located in the first filter cavity 850, so that the mixture discharged from the hollow standpipe 420 can flow directly into the first filter cavity 850. In a preferred embodiment, the outlet of the hollow standpipe 420 is toward the inner wall of the recovery tank container 400 (i.e., toward the rear wall of the first filter cavity of the filter), so that the mixture discharged from the hollow standpipe 420 can be sprayed toward the rear wall of the first filter cavity of the filter, thereby facilitating the deposition of liquid and the filtration of solid.

[0056] In the present disclosure, the first filter chamber 850 is formed by a top wall 810, a bottom wall 820, a rear wall 890, a first side wall 830 and an inner wall of the recovery tank container 400; in the present disclosure, there are two first side walls 830, and both of these first side walls 830 are used to define the first filter chamber 850; that is, the first filter chamber 850 of the present disclosure is formed in the space between the two first side walls 830.

[0057] The second filter cavity 860 is formed by the top wall 810 , the bottom wall 820 , the first side wall 830 , the second side wall 840 and the inner wall of the recovery tank container 400 , and the first filter cavity 850 and the first filter cavity 850 are fluidically connected through the drainage hole on the first side wall 830 .

[0058] Specifically, the second filter cavity 860 of the present disclosure is formed in two, and the two second filter cavities 860 are located on both sides of the first filter cavity 850 .

[0059] Refer to Figure 5 The first side wall 830 and the second side wall 840 of the present disclosure have a common edge, and the first side wall 830 and the second side wall 840 are at an angle of 30-90 degrees, so that the second filter cavity 860 can have a preset size and can contain some solid waste.

[0060] like Figure 7 As shown, the side wall of the present disclosure further includes a closed third side wall 870, and the third side wall 870, the second side wall 840, and the bottom wall 820 form a first airflow duct. At this time, the airflow will flow upward along the first airflow duct and then flow out from the first opening 811 described below.

[0061] Specifically, the top wall 810 of the present disclosure has a first opening 811, and the first opening 811 is in fluid communication with the first airflow duct. Moreover, the top wall 810 has a second opening 812, and the second opening 812 is in fluid communication with the second filter cavity 860. That is, the gas in the second filter cavity 860 of the present disclosure can flow to the first airflow duct, and flow from the first airflow duct to the first opening 811, and then be discharged; or it can be discharged directly through the second opening 812.

[0062] In a preferred embodiment, the first opening 811 is adjacent to the second opening 812 and is separated by the second side wall 840 .

[0063] In some embodiments, a guide cover 880 is disposed on the top wall 810 , and the guide cover 880 covers the first opening 811 and the second opening 812 ; the guide cover 880 has a fluid guide port 881 , and the direction of the fluid guide port 881 is substantially opposite to the direction of the outlet of the hollow riser 420 .

[0064] That is, the fluid guide port 881 of the guide cover 880 of the present disclosure can communicate with the first opening 811 and the second opening 812 , so that the gas flowing through the first opening 811 and the second opening 812 will be discharged through the fluid guide port 881 of the guide cover 880 .

[0065] In the liquid recovery system disclosed in the present invention, the first side wall 830 and the second side wall 840 are provided to confine most of the solid waste in the first filter chamber 850. After the user has dumped the waste, the filter can be cleaned by simply rinsing it under the faucet. Moreover, the first filter chamber 850 disclosed in the present invention is transparent from left to right, which facilitates the user's cleaning operation. Accordingly, the liquid recovery system disclosed in the present invention improves the user experience without increasing the cost.

[0066] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A liquid recovery system, characterized in that: include: Suction source; a suction nozzle disposed on a cleaning head in fluid communication with a suction source; a recovery tank container including a hollow riser forming an inlet flow passage to a recovery chamber defined within the recovery tank container; as well as A filter, wherein the filter is detachably mounted in the recovery tank container; wherein the filter comprises: a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall; the side wall comprises a first side wall and a second side wall having drainage holes; the filter comprises a first filter cavity and a second filter cavity, wherein the first filter cavity and the second filter cavity are both located on the gas channel in the recovery chamber, and the second filter cavity is located downstream of the first filter cavity; Wherein, the first filter chamber is formed by the top wall, the bottom wall, the first side wall and the inner wall of the recovery tank container; the second filter chamber is formed by the top wall, the bottom wall, the first side wall, the second side wall and the inner wall of the recovery tank container, and the first filter chamber and the second filter chamber are fluidically connected through the drainage hole on the first side wall.

2. The liquid recovery system according to claim 1, characterized in that: The outlet of the hollow standpipe is located in the first filter cavity.

3. The liquid recovery system according to claim 2, characterized in that: The outlet of the hollow vertical pipe faces the rear wall of the first filter cavity of the filter.

4. The liquid recovery system according to claim 1, characterized in that: The first side wall and the second side wall have a common edge, and the first side wall and the second side wall form an angle of 30-90 degrees.

5. The liquid recovery system according to claim 1, characterized in that: The side wall further includes a closed third side wall, and the third side wall, the second side wall, and the bottom wall form a first air flow duct.

6. The liquid recovery system according to claim 5, characterized in that: The top wall has a first opening, and the first opening is in fluid communication with the first air flow duct.

7. The liquid recovery system according to claim 6, characterized in that: The top wall is provided with a second opening, and the second opening is in fluid communication with the second filter cavity.

8. The liquid recovery system according to claim 7, characterized in that: The first opening is adjacent to the second opening and is spaced apart by the second sidewall.

9. The liquid recovery system according to claim 7, characterized in that: The top wall is provided with a guide cover, which covers the first opening and the second opening; the guide cover has a fluid guide port, and the direction of the fluid guide port is substantially opposite to the direction of the outlet of the hollow riser.

10. A surface cleaning device, characterized in that: include: Upright body; a cleaning head mounted on the upright body, the cleaning head being movable over the surface to be cleaned, the upright body being operable in a manner substantially parallel to the surface to be cleaned during operation of the surface cleaning apparatus; A liquid supply tank assembly, the liquid supply tank assembly being disposed on the upright body or the cleaning head and being used for providing cleaning liquid to the cleaning head; a fluid distributor, the fluid distributor being mounted on the cleaning head, wherein the fluid distributor is in fluid communication with the liquid supply tank assembly to provide the cleaning liquid in the liquid supply tank assembly to the cleaning head; as well as The liquid recovery system according to any one of claims 1 to 9, wherein the liquid recovery system is at least used to recover and store cleaning liquid after cleaning the surface to be cleaned.

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