Liquid recovery system and surface cleaning equipment

Abstract

The utility model provides a liquid recovery system and surface cleaning equipment. The liquid recovery system comprises a suction source, a suction nozzle, a recovery tank container, a hollow vertical pipe and a filter, the suction nozzle is arranged on the cleaning head in fluid communication with the suction source; the recovery tank container comprises a recovery chamber, and the recovery chamber comprises a first cavity and a second cavity communicated with the first cavity; a hollow riser in fluid communication with the suction nozzle, the hollow riser forming a flow channel leading to a recovery chamber within the recovery tank container, the hollow riser comprising an inlet and an outlet; the filter is detachably mounted in the recovery tank container; wherein the filter comprises a shielding cavity, and the shielding cavity is located at an outlet of the hollow vertical pipe; the shielding cavity is located between the first cavity and the second cavity; the shielding cavity comprises a bottom wall, a top wall opposite to the bottom wall and a pair of first side walls connected with the bottom wall and the top wall; wherein a limiting structure is formed on the top wall so as to prevent the liquid from moving towards the gas outlet of the recovery tank container along the top wall when the suction source is started.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a liquid recovery system and a surface cleaning apparatus. BACKGROUND

[0002] A scrubber is a cleaning apparatus suitable for domestic use, mainly used for cleaning and washing the floor surface of a home. The scrubber in the prior art usually has the functions of water spraying and water suction. The scrubber can automatically spray water and wash the floor, and then suck the sewage and residual dirt into the sewage tank of the machine.

[0003] To meet the cleaning needs of users in low space, the scrubber needs to be laid down by 180 degrees for cleaning. Laying down by 180 degrees is easy to cause the sewage to flow back into the fan, causing damage. Therefore, it is necessary to solve the problem of sewage flowing back into the fan when the machine is laid down by 180 degrees or close to 180 degrees.

[0004] Currently, there are two main solutions in the prior art to solve this problem: 1. A separation fan assembly is added between the fan and the sewage tank, and water and gas are separated by the rotation of the fan blade; 2. The separation is realized by taking advantage of the weight difference between solid, liquid and gas, that is, obstacles are set up in the structure to make the airflow upward and the water flow downward, realizing separation.

[0005] However, these separation schemes do not work well in use. CONTENT OF THE INVENTION

[0006] The present disclosure provides a liquid recovery system and a surface cleaning apparatus.

[0007] According to one aspect of the present disclosure, a liquid recovery system is provided, comprising:

[0008] a suction source;

[0009] a suction nozzle disposed on a cleaning head in fluid communication with the suction source;

[0010] a recovery tank container comprising a recovery chamber, the recovery chamber comprising a first cavity and a second cavity in communication with the first cavity;

[0011] a hollow riser in fluid communication with the suction nozzle, the hollow riser forming a flow passage to the recovery chamber within the recovery tank container, the hollow riser comprising an inlet and an outlet, the inlet of the hollow riser being in fluid communication with the suction nozzle; and

[0012] A filter is removably installed in the recycling canister; wherein the filter includes a baffle cavity located at the hollow riser outlet; the baffle cavity is located between the first cavity and the second cavity; the baffle cavity includes a bottom wall, a top wall opposite to the bottom wall, and a pair of first side walls connecting the bottom wall and the top wall; wherein the top wall is formed with a restriction structure for hindering liquid moving along the top wall to the gas outlet of the recycling canister when the suction source is started.

[0013] According to at least one embodiment of the liquid recycling system of the present disclosure, the restriction structure includes a restriction plate located at a free end of the top wall and having a non-0° angle with the axis of the hollow riser.

[0014] According to at least one embodiment of the liquid recycling system of the present disclosure, the restriction structure includes a restriction slot located on the top wall downstream of the restriction plate.

[0015] According to at least one embodiment of the liquid recycling system of the present disclosure, the restriction slot includes a first slot wall and a second slot wall intersecting the first slot wall downstream of the first slot wall, the first slot wall being substantially perpendicular to the axis of the hollow riser, and the second slot wall being inclined to the axis of the hollow riser.

[0016] According to at least one embodiment of the liquid recycling system of the present disclosure, the restriction structure includes a restriction protrusion located on the top wall upstream of the restriction plate.

[0017] According to at least one embodiment of the liquid recycling system of the present disclosure, the first cavity accommodates the bottom wall, the second cavity accommodates the top wall, and the first side walls extend from the first cavity to the second cavity.

[0018] According to at least one embodiment of the liquid recycling system of the present disclosure, an air flow opening is formed between the top wall and the pair of first side walls to communicate the first cavity and the second cavity.

[0019] According to at least one embodiment of the liquid recycling system of the present disclosure, the filter further includes a pair of second side walls proximate to the right end, the pair of second side walls respectively extend laterally in the first cavity in a direction substantially perpendicular to the first side walls.

[0020] According to at least one embodiment of the liquid recycling system of the present disclosure, the second side walls include a sealing strip thereon, the sealing strip abuts against an inner wall of the first cavity to form a sealed isolation section proximate to the right end.

[0021] According to another aspect of the present disclosure, a surface cleaning apparatus is provided, comprising:

[0022] an upright body;

[0023] a cleaning head mounted on the upright body, the cleaning head being movable over a 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;

[0024] a liquid supply tank assembly provided on the upright body or the cleaning head for supplying cleaning liquid to the cleaning head;

[0025] a fluid distributor mounted on the cleaning head, wherein the fluid distributor is in fluid communication with the liquid supply tank assembly for supplying cleaning liquid in the liquid supply tank assembly to the cleaning head; and

[0026] the liquid recovery system as described above for recovering and storing cleaning liquid after cleaning the surface to be cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure.

[0028] Figure 1 is a schematic view of a surface cleaning apparatus according to an embodiment of the present disclosure.

[0029] Figure 2 is a schematic view of a cleaning head according to an embodiment of the present disclosure.

[0030] Figure 3 is a schematic view of a recovery tank container and a filter in an assembled state according to an embodiment of the present disclosure.

[0031] Figure 4 is a schematic view of a recovery tank container and a filter in an assembled state according to an embodiment of the present disclosure.

[0032] Figure 5 is a schematic view of a recovery tank container and a filter in an assembled state according to an embodiment of the present disclosure.

[0033] Figure 6 is a schematic view of a recovery tank container and a filter in an assembled state according to an embodiment of the present disclosure.

[0034] Figure 7 is a schematic view of a recovery tank container and a filter in an assembled state according to an embodiment of the present disclosure.

[0035] Figure 8is a structure diagram of another angle of the filter according to an embodiment of the present disclosure.

[0036] The reference numerals in the drawings are specifically:

[0037] 100 handle portion

[0038] 200 main body portion

[0039] 300 liquid supply tank assembly

[0040] 400 recovery tank container

[0041] 410 first cavity

[0042] 420 second cavity

[0043] 500 connecting portion

[0044] 600 cleaning head

[0045] 610 roller brush

[0046] 620 suction nozzle

[0047] 700 hollow standpipe

[0048] 800 filter

[0049] 810 bottom wall

[0050] 820 top wall

[0051] 830 first side wall

[0052] 840 restriction structure

[0053] 841 restriction plate

[0054] 842 restriction groove

[0055] 842A first groove wall

[0056] 842B second groove wall

[0057] 843 restriction protrusion

[0058] 850 second side wall

[0059] 860 sealing strip

[0060] 870 detection needle

[0061] 880 baffle

[0062] 890 air flow opening. DETAILED DESCRIPTION

[0063] The present disclosure will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are merely exemplary and are not limiting to the present disclosure. In addition, it should also be understood that for the convenience and clarity of the description, only parts of the relevant are shown in the drawings.

[0064] It should be noted that the embodiments and features of the present disclosure can be combined with each other if there is no conflict. The technical solutions of the present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0065] Unless otherwise specified, the exemplary embodiments / examples shown will be understood as providing exemplary features of various details that can implement the technical concepts of the present disclosure in practice. Therefore, unless otherwise specified, the features of various embodiments / examples can be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of the present disclosure.

[0066] In the drawings, cross-hatching and / or shading are generally used to indicate that a portion of one component is positioned above another component, or that the portion of one component is positioned below another component. As such, unless otherwise specified, the presence of cross-hatching or shading is not a requirement for any particular material, material property, size, proportion, commonality of the illustrated components, or any other characteristic, attribute, property, or the like of the components. In addition, the dimensions and the relative dimensions of the portions in the drawings are chosen primarily for convenience and clarity of presentation and are not necessarily shown to scale. When exemplary embodiments can be practiced differently, a specific process sequence can be performed in a different order than the described order. For example, two consecutively described processes can be performed substantially simultaneously or in the reverse order of the described order. Furthermore, like reference numerals denote like parts throughout the specification.

[0067] When a component is referred to as being “on” or “above” another component, “connected to” or “coupled to” another component, it can be directly on, directly connected to, or directly coupled to the other component, or intervening components can be present. However, when a component is referred to as being “directly on” or “directly connected to” or “directly coupled to” another component, there are no intervening components present. For this reason, the term “connected” can refer to a physical connection, an electrical connection, or the like, with or without intervening components.

[0068] For descriptive purposes, the present disclosure can use spatial or relative terms, such as "below," "lower," "under," "lessor," "above," "upper" "on," "over," "higher," and "side" (e.g., as in "sidewall") to describe the relative relationship between one element to another as shown in the figures. The spatial or 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 figures. For example, if the device in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Moreover, the device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatial or relative descriptors used herein interpreted accordingly.

[0069] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including," "includes," "having," "has," "with," or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising." It is also noted that the terms "substantial," "approximately," and other similar terms, as used herein, are used in a relative sense and not in an absolute sense. Thus, they are used to indicate that a value, calculation, and / or provided value is close to a true value, but not exact.

[0070] Figure 1 is a structural schematic view of a surface cleaning apparatus according to an embodiment of the present disclosure. Figure 2 is a structural schematic view of a cleaning head according to an embodiment of the present disclosure.

[0071] The surface cleaning apparatus of the present disclosure is configured to enable wet cleaning of a surface to be cleaned, which can be a floor surface, preferably a domestic floor surface. At the same time, dirt and liquid (sullage) after cleaning the surface to be cleaned can be recovered to the surface cleaning apparatus after the surface cleaning apparatus performs wet cleaning of the floor surface.

[0072] The surface cleaning apparatus of the present disclosure can include an upright main body, in particular, the upright main body of the present disclosure can 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, a user can operate the surface cleaning apparatus by operating the handle portion 100, and the upright main body can work in a manner substantially parallel to the surface to be cleaned during the working process of the surface cleaning apparatus.

[0073] The handle portion 100 can be provided with a user interaction key, and the user can control the surface cleaning apparatus by triggering the user interaction key, for example, to control the start and stop of the surface cleaning apparatus, and to control the liquid supply speed and suction power of the suction source of the surface cleaning apparatus.

[0074] The main body portion 200 is pivotally connected to the cleaning head 600 through the connecting portion 500; thus, 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.

[0075] In one example, the connecting portion 500 can include a universal joint so that the main body portion 200 can rotate in two directions relative to the cleaning head 600. In another example, the connecting portion 500 can include a multi-axis joint that can couple the main body portion 200 with the cleaning head 600 so as to allow the main body portion 200 to rotate relative to the cleaning head 600 along a first direction and a second direction.

[0076] The main body portion 200 can be pivoted to an upright position (also referred to as a storage position) through the connecting portion 500, in which position, the included angle between the main body portion 200 and the surface of the cleaning head 600 (or the ground on which it is placed) is 80°~90°, preferably about 80°. In this position, the surface cleaning apparatus is in a self-supporting posture (also referred to as an upright posture), that is, the main body portion 200 and the like can be supported by the cleaning head 600, and the upright posture can be achieved without the aid of other objects.

[0077] The main body portion 200 can also accommodate components such as the liquid supply tank assembly 300 and the recovery tank container 400, in the present disclosure, the liquid supply tank assembly 300 is detachably mounted to the side of the main body portion 200, and the mounting position can be located on the front side of the main body portion 200. The recovery tank container 400 is detachably mounted to the side of the main body portion 200, and the mounting position can be located on the rear side of the main body portion. In another embodiment, the liquid supply tank assembly 300 of the present disclosure can also be arranged on the cleaning head 600.

[0078] In one example, the thickness of the recycling tank container 400 is set to be less than its width, and the height of the liquid supply tank assembly 300 is set to be less than its width. This ensures sufficient capacity and allows the overall height of the surface cleaning equipment to be less than a predetermined height, such as 120mm, after the main body 200 is laid flat.

[0079] The liquid supply tank assembly 300 is used to store the cleaning liquid to be dispensed. Accordingly, the liquid supply tank assembly 300 can be connected and fluidly communicated with a fluid distributor (not shown in the figure), so that the cleaning liquid in the liquid supply tank assembly 300 can be pressurized by the fluid distributor and supplied to the cleaning head 600, or to the surface to be cleaned near the cleaning head 600, thereby enabling wet cleaning of the surface to be cleaned by the cleaning liquid.

[0080] In one example, the fluid dispenser may include a supply pump capable of drawing cleaning liquid from the supply tank assembly 300, pressurizing the cleaning liquid, and supplying it to the outlet component, which then supplies 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.

[0081] In this disclosure, the cleaning liquid can be one or more of any suitable liquid, including but not limited to cleaning water, concentrated detergent, diluted detergent, or mixtures thereof. Furthermore, the cleaning liquid can be a room-temperature cleaning liquid or a high-temperature cleaning liquid.

[0082] The main body 200 has a receiving space. The recycling tank container 400 is detachably installed in the main body 200 and located in the receiving space. When the recycling tank container 400 contains a large amount of liquid, the user can remove the recycling tank container 400, pour out the sewage inside, and clean up the solid waste. At this time, part of the outer surface of the recycling tank container 400 forms part of the outer surface of the surface cleaning device.

[0083] like Figure 2 As shown, the cleaning head 600 of this 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 allowing used cleaning liquid and dirt to enter the recycling pipe through the suction nozzle 620 and further flow to the recycling tank container 400.

[0084] Based on the above structure, the surface cleaning equipment disclosed herein can form a liquid recovery system with the recovery tank container 400 at its center.

[0085] Specifically, the liquid recovery system disclosed herein may include components such as a suction source, a suction nozzle 620, a recovery tank container 400, a hollow riser 700, and a filter 800.

[0086] The suction source of the present disclosure can be an electric suction source, which is capable of generating negative pressure when in operation, the negative pressure being capable of being applied to the recycling tank container 400. Further, the negative pressure can be provided to the suction nozzle 620 via the hollow riser 700 and the recycling pipe. In other words, the suction nozzle 620 of the present disclosure can be in fluid communication with the suction source.

[0087] Figure 3 is a structure schematic diagram of the recycling tank container and the filter in an assembled state according to one embodiment of the present disclosure. Figure 4 is a structure schematic diagram of the recycling tank container and the filter in an assembled state according to one embodiment of the present disclosure. Figure 5 is a structure schematic diagram of the recycling tank container and the filter in an assembled state according to one embodiment of the present disclosure. Figure 6 is a structure schematic diagram of the recycling tank container and the filter in an assembled state according to one embodiment of the present disclosure.

[0088] As shown in Figures 3 to 6 , the recycling tank container 400 of the present disclosure comprises a recycling chamber, which comprises a first cavity 410 and a second cavity 420 in communication with the first cavity 410. In the direction shown by Figure 5 , the first cavity 410 is located below the second cavity 420.

[0089] As shown in Figure 5 and Figure 6 , in the present disclosure, the hollow riser 700 is in fluid communication with the suction nozzle 620, and the hollow riser 700 forms a flow passage to the recycling chamber in the recycling tank container 400. In a preferred embodiment, the hollow riser 700 can be integrally formed with the recycling tank container 400.

[0090] The hollow riser 700 of the present disclosure has an inlet and an outlet, in the direction shown by Figure 5 , the left end of the hollow riser 700 is formed as an inlet, and correspondingly, the right end of the hollow riser 700 is formed as an outlet.

[0091] Figure 7 is a structure schematic diagram of the filter according to one embodiment of the present disclosure.

[0092] As shown in Figure 7 , the filter 800 of the present disclosure is detachably installed in the recycling tank container 400; wherein the filter 800 comprises a shielding cavity, which is located at the outlet of the hollow riser 700; the shielding cavity is located between the first cavity 410 and the second cavity 420; in terms of structure, the shielding cavity comprises a bottom wall 810, a top wall 820 opposite to the bottom wall 810, and a pair of first side walls 830 connecting the bottom wall 810 and the top wall 820 (in the direction shown by Figure 5The direction shown); wherein a restriction structure 840 is formed on the top wall 820 to restrict the liquid from moving along the top wall 820 back to the gas outlet of the recycling tank container when the suction source is started. Specifically, the gas outlet of the recycling tank container is the gas outlet of the whole formed after the recycling tank container is assembled with the filter (the whole can be referred to as a recycling tank assembly).

[0093] When the liquid recycling system of the present disclosure is in use, sewage and dirt will enter the shielding cavity through the hollow riser 700, solid waste and part of the sewage will fall into the sewage basket, and gas and part of the sewage will continue to rise. The sewage travels along the inner surface of the top wall 820, and through the arrangement of the restriction structure 840, the deposition of the sewage is completed, and the deposited sewage is stored in the recycling tank container 400. The gas will continue to move to the suction source, so that as little sewage as possible is sucked into the suction source, thereby prolonging the service life of the suction source.

[0094] Referring again to Figure 5 The restriction structure 840 of the present disclosure includes a restriction plate 841 located at the free end of the top wall 820 and at a non-0° angle with the axis of the hollow riser 700. Thus, by arranging the restriction plate 841, the flow direction of the flowing fluid (i.e. the mixture of gas and liquid) can be forcibly changed, thereby facilitating the adhesion of the fluid on the restriction plate 841, and accordingly reducing the liquid content in the fluid.

[0095] In the present disclosure, the restriction structure 840 includes a restriction groove 842 located downstream of the restriction plate 841 on the top wall 820; that is, along the fluid flow direction in the recycling tank container 400, the restriction groove 842 is located on the downstream side of the restriction plate 841.

[0096] Specifically, the restriction groove 842 of the present disclosure includes a first groove wall 842A and a second groove wall 842B intersecting the first groove wall 842A downstream of the first groove wall 842A, the first groove wall 842A is substantially perpendicular to the axis of the hollow riser 700, and the second groove wall 842B is inclined to the axis of the hollow riser 700. Accordingly, the cross section of the restriction groove 842 of the present disclosure can be triangular.

[0097] Referring again to Figure 5 The restriction structure 840 of the present disclosure further includes a restriction protrusion 843 located upstream of the restriction plate 841 on the top wall 820; that is, along the fluid flow direction in the recycling tank container 400, the restriction protrusion 843 is located on the upstream side of the restriction plate 841.

[0098] In a preferred embodiment, the position where the limiting protrusion 843 is formed on the top wall 820 corresponds to the position of the limiting groove 842. In other words, when the top wall 820 has a substantially uniform wall thickness, the groove formed on the upper surface of the top wall 820 corresponds to the protrusion formed on the lower surface.

[0099] Referring again to Figure 5 In the present disclosure, the first cavity 410 accommodates the bottom wall 810, the second cavity 420 accommodates the top wall 820, and the first side wall 830 extends from the first cavity 410 to the second cavity 420.

[0100] The top wall 820 and the pair of first side walls 830 form a gas flow opening 890 that communicates the first cavity 410 and the second cavity 420, and enables gas exchange between the first cavity 410 and the second cavity 420 through the gas flow opening 890.

[0101] The filter 800 of the present disclosure further includes a pair of second side walls 850 near the right end, which respectively extend transversely in the first cavity 410 in a direction substantially perpendicular to the first side wall 830.

[0102] More preferably, the second side wall 850 includes a sealing strip 860, which abuts the inner wall of the first cavity 410 to form a sealed isolation section near the right end. Thus, when the liquid recovery system of the present disclosure is in use, the sealing strip 860 can be sealed with the side wall and prevent the liquid in the recovery tank container 400 from climbing up the wall and being sucked into the suction source when the recovery tank container 400 is in a negative pressure environment, thereby preventing damage to the suction source.

[0103] In an embodiment, the filter 800 of the present disclosure further includes a detection needle 870, wherein the detection needle 870 can be disposed below the second side wall 850, and a baffle 880 is provided near the left end of the detection needle 870 (i.e., the detection end of the detection needle 870), and blocks the liquid to prevent a large amount of sewage from flowing in to conduct the water full detection needle when surging, causing false water full.

[0104] In the description of the specification, the description of the terms "one embodiment / way", "some embodiments / ways", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the specification and the features of the different embodiments / ways or examples, without contradiction.

[0105] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0106] The person skilled in the art should understand that the above-mentioned embodiments are only for clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. Based on the above disclosure, other changes or modifications can also be made by those skilled in the art, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A liquid recovery system, characterized by, The liquid recovery system comprises: a suction source; a suction nozzle disposed on a cleaning head in fluid communication with the suction source; a recovery tank container comprising a recovery chamber, the recovery chamber comprising a first cavity and a second cavity in communication with the first cavity; a hollow riser in fluid communication with the suction nozzle, the hollow riser forming a flow passage to the recovery chamber within the recovery tank container, the hollow riser comprising an inlet and an outlet, the inlet of the hollow riser being in fluid communication with the suction nozzle; and a filter removably mounted within the recovery tank container, wherein the filter comprises a baffle cavity located at the outlet of the hollow riser, the baffle cavity being located between the first cavity and the second cavity, the baffle cavity comprising a bottom wall, a top wall opposite to the bottom wall, and a pair of first side walls connecting the bottom wall and the top wall, wherein the top wall forms a restriction structure thereon for hindering liquid moving along the top wall towards a gas outlet of the recovery tank container when the suction source is activated. The restriction structure comprises a restriction plate located at a free end of the top wall and having a non-0° angle with respect to an axis of the hollow riser.

2. The liquid recovery system of claim 1, wherein, The restriction structure comprises a restriction groove located on the top wall downstream of the restriction plate.

3. The liquid recovery system of claim 2, wherein, The restriction groove comprises a first groove wall substantially perpendicular to the axis of the hollow riser and a second groove wall intersecting the first groove wall downstream of the first groove wall.

4. The liquid recovery system of claim 3, wherein, The restriction structure comprises a restriction protrusion located on the top wall upstream of the restriction plate.

5. The liquid recovery system of claim 3, wherein, The first cavity accommodates the bottom wall, the second cavity accommodates the top wall, and the first side walls extend from the first cavity to the second cavity.

6. The liquid recovery system of claim 1, wherein, An air flow opening is formed between the top wall and the pair of first side walls to communicate the first cavity and the second cavity.

7. The liquid recovery system of claim 1, wherein, The filter further comprises a pair of second side walls proximate to a right end of the filter, the pair of second side walls respectively extend laterally within the first cavity in a direction substantially perpendicular to the first side walls.

8. The liquid recovery system of claim 1, wherein, The second side walls comprise a sealing strip thereon abutting against an inner wall of the first cavity to form a sealed isolation section proximate to the right end of the filter.

9. The liquid recovery system of claim 8, wherein, The surface cleaning apparatus comprises:

10. A surface cleaning apparatus characterized by, a standing main body; a cleaning head mounted on the standing main body, the cleaning head being movable on a surface to be cleaned, the standing main 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 disposed on the standing main body or the cleaning head 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 within the liquid supply tank assembly to the cleaning head; and the liquid recovery system of any one of claims 1-9 for recovering and storing the cleaning liquid after cleaning the surface to be cleaned. ​ ​

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