Filtering device and underwater cleaning robot

Abstract

The utility model relates to a filtering device and an underwater cleaning robot, the filtering device comprises a frame body and a filtering bag, the frame body is provided with a mounting cavity, and the bottom wall of the mounting cavity is provided with a water inlet; the filter pocket is detachably arranged in the mounting cavity; the filter pocket is provided with an assembly cavity; the filter pocket is detachably connected with the mounting cavity and corresponds to the water inlet, so that the water inlet is communicated with the assembly cavity. Thus, water flow enters the assembly cavity from the water inlet and then is filtered by the filter pocket, and the filtering and cleaning effects on the water flow are achieved. In addition, the filter bag is low in cost and convenient to replace and clean.

Description

Technical Field

[0001] This application relates to the field of cleaning robots, and more particularly to a filtration device and an underwater cleaning robot. Background Technology

[0002] An underwater cleaning robot is an automated cleaning machine that can clean water. For example, a pool cleaning robot can clean a pool underwater. When the underwater cleaning robot is working, the water drawn in through the inlet is processed by a filtration device and then discharged through the outlet, thus cleaning the water in the pool.

[0003] In related technologies, the filtration device of underwater cleaning robots uses nylon filter screens, and in order to improve filtration accuracy, dense filter paper is usually placed on the outside of the nylon filter screen.

[0004] After use, filter devices tend to accumulate dirt and need to be cleaned frequently. However, the filter paper on the outside of the nylon filter screen is not easy to replace and clean. To maintain cleanliness, the entire filter device is usually replaced, which results in higher costs. Utility Model Content

[0005] This application provides a filtration device and an underwater cleaning robot to achieve the goals of reducing costs and facilitating replacement and cleaning.

[0006] In a first aspect, this application provides a filtration device, comprising:

[0007] The frame has a mounting cavity, and the bottom wall of the mounting cavity is provided with a water inlet;

[0008] A filter bag is detachably disposed within the mounting cavity; the filter bag has an assembly cavity; the filter bag is detachably connected to the mounting cavity and is disposed corresponding to the water inlet so that the water inlet communicates with the assembly cavity.

[0009] Furthermore, the end of the filter bag furthest from the water inlet is detachably connected to the frame.

[0010] Alternatively, it may also include a filter screen having a filter chamber; the filter screen is disposed within the assembly chamber, and the end of the filter pocket furthest from the water inlet is detachably connected to the filter screen.

[0011] Furthermore, the filter pocket is provided with a second elastic ring at the end away from the water inlet, and is detachably connected to the frame or the filter screen through the second elastic ring.

[0012] Furthermore, the filter pocket includes:

[0013] The bag body includes a bottom bag and a cylindrical peripheral bag; the bottom bag is connected to one end of the peripheral bag and together with the peripheral bag forms an open assembly cavity; the filter screen is detachably disposed in the assembly cavity; the bottom bag is provided with a water passage hole, and the water passage hole communicates with the assembly cavity;

[0014] The first water inlet cylinder has a first water inlet channel; the first water inlet cylinder is connected to the bottom pocket and is configured corresponding to the water passage hole so that the first water inlet channel communicates with the water passage hole; the end of the first water inlet cylinder away from the bottom pocket is detachably connected to the water inlet of the bottom wall of the mounting cavity.

[0015] Furthermore, the filter bag also includes a second water inlet cylinder, which has a second water inlet channel; the second water inlet cylinder is located inside the assembly cavity; the second water inlet cylinder is connected to the bottom bag and is configured corresponding to the water passage hole, so that the second water inlet channel communicates with the water passage hole;

[0016] The second water inlet cylinder has a counterweight assembly at the end away from the bottom pocket.

[0017] Furthermore, the counterweight assembly includes two counterweight bars and an elastic limiting bar. The two counterweight bars are disposed opposite each other at the end of the second water inlet tube away from the bottom pocket. One end of the elastic limiting bar is connected to one of the counterweight bars, and the other end is connected to the bottom pocket.

[0018] Furthermore, the frame includes:

[0019] frame;

[0020] A base plate is rotatably connected to one end of the frame and forms the mounting cavity with the frame; the base plate has the water inlet; the first water inlet cylinder is detachably connected to the base plate.

[0021] Furthermore, a mounting ring protrudes from the side of the base plate facing the mounting cavity, and the mounting ring surrounds the water inlet; a retaining ring protrudes from the peripheral wall of the mounting ring.

[0022] The first water inlet cylinder is connected to the bottom plate at one end and is provided with a first elastic ring. The first elastic ring is sleeved on the mounting ring platform and snapped into the retaining ring.

[0023] Furthermore, the mounting ring platform is provided with at least two supporting members; after the first water inlet cylinder is connected to the mounting ring platform, the supporting members are located in the first water inlet channel.

[0024] Secondly, this application provides a cleaning robot, comprising:

[0025] The cleaning robot itself has a filtration space;

[0026] The filtration device described above is installed within the filtration space.

[0027] The technical solution provided in this application has the following advantages compared with the prior art:

[0028] The filtration device provided in this application includes a frame and a filter bag. The frame has a mounting cavity, and the bottom wall of the mounting cavity has a water inlet. The filter bag is detachably disposed within the mounting cavity. The filter bag has an assembly cavity. The filter bag is detachably connected to the bottom wall of the mounting cavity and is positioned corresponding to the water inlet so that the water inlet communicates with the assembly cavity. Thus, in this application, water flows into the assembly cavity from the water inlet and then passes through the filter bag, achieving a filtration and cleaning effect on the water flow. Furthermore, the filter bag in this application is low in cost and can be easily replaced and cleaned. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0032] Figure 1 This is a schematic diagram of the structure of a filtration device provided in an embodiment of this application;

[0033] Figure 2 for Figure 1 Another angle view of the middle filter bag;

[0034] Figure 3 for Figure 1 Schematic diagram of the middle frame;

[0035] Figure 4 for Figure 3 A schematic diagram of the mid-base plate.

[0036] Explanation of reference numerals in the attached figures:

[0037] Filter device 100,

[0038] Frame 1, mounting cavity 1a, water inlet 1b, frame 11, handle 111, sealing strip 112, frame strip 113, upper frame 114, lower frame 115, snap-fit ​​block 116, base plate 12, mounting ring platform 121, retaining ring 122, support piece 123, fastener 124, handle part 125, rotating shaft 126.

[0039] Filter screen 21, filter chamber 21a, filter pocket 22, pocket body 221, bottom pocket 2211, peripheral pocket 2212, assembly cavity 221a, water passage hole 221b, first water inlet cylinder 222, second water inlet cylinder 223, second water inlet channel 223a, counterweight assembly 224, counterweight bar 2241, elastic limiting bar 2242, first elastic ring 225, second elastic ring 226. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0042] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0043] To address the technical problems of inconvenient replacement and cleaning, and high cost of existing filter devices, this application provides a filter device that can reduce costs and facilitate replacement and cleaning.

[0044] The filtration device 100 can be applied to an underwater cleaning robot. The underwater cleaning robot includes a shell, a walking mechanism, a cleaning device, the filtration device 100, and a pump. The walking mechanism is mounted on the bottom of the shell. The cleaning device includes a roller brush and is also mounted on the bottom of the shell. A filtration space is provided inside the shell, and the filtration device 100 is detachably installed within this space. Specifically, the bottom of the shell has a water inlet, and the upper part of the shell has a cover. The cover is detachably or rotatably connected to the shell to facilitate the removal and placement of the filtration device 100. The shell also has an outlet. Driven by the pump, water enters through the inlet, is filtered by the filtration device 100 within the filtration space, and then flows out through the outlet.

[0045] Firstly, Figure 1 and Figure 2A filtration device 100 is provided in this application embodiment. The filtration device 100 includes a frame 1 and a filter bag 22. The frame 1 has a mounting cavity 1a, and the bottom wall of the mounting cavity 1a is provided with a water inlet 1b. When the filtration device 100 is installed in the filtration space of an underwater cleaning robot, the water inlet 1b is correspondingly arranged with the water inlet of the underwater cleaning robot. The filter bag 22 is detachably disposed in the mounting cavity 1a. The filter bag 22 has an assembly cavity 221a. The filter bag 22 is detachably connected to the bottom wall of the mounting cavity 1a and is arranged corresponding to the water inlet 1b so that the water inlet 1b communicates with the assembly cavity 221a. In this way, water flows into the assembly cavity from the water inlet and then passes through the filter bag to achieve a filtration and cleaning effect on the water flow. Moreover, the filter bag in this application is low in cost and can be easily replaced and cleaned.

[0046] In one embodiment, the end of the filter bag 22 furthest from the inlet 1b is detachably connected to the frame. The top of the filter bag is connected to the top of the frame, and the frame secures the filter bag. Preferably, the end of the filter bag 22 furthest from the inlet 1b is provided with a second elastic ring 226, and is detachably connected to the frame 1 via the second elastic ring 226.

[0047] refer to Figure 1 In another embodiment, a filter screen 21 is also included, which has a filter chamber 21a. The filter screen 21 is disposed within the assembly chamber 221a, and the end of the filter pocket 22 away from the water inlet 1b is detachably connected to the filter screen 21. Preferably, the end of the filter pocket 22 away from the water inlet 1b is provided with a second elastic ring 226, and is detachably connected to the filter screen 21 through the second elastic ring 226. In this way, the filter pocket and the filter screen are combined into a filter assembly, which allows for convenient simultaneous removal and insertion of the filter pocket and the filter screen.

[0048] It is understood that the frame 1 provides installation support for the filter assembly 2. Water flows into the filter chamber 21a from the inlet 1b, and then undergoes dual filtration through the filter screen 21 and filter bag 22 to achieve a filtration and cleaning effect on the water flow. Furthermore, in this application, the filter bag 22 and the filter screen 21 are two separable components. This allows for easy replacement and cleaning of the filter bag 22. The filter screen 21 can be repeatedly cleaned and reused, and the filter bag 22 can also be cleaned and reused multiple times. To improve the cleaning effect, the filter bag 22 can also be directly replaced. Compared to replacing the filter device 100, this application only requires replacing the filter bag 22, thus reducing costs.

[0049] Preferably, the filtration accuracy of the filter bag 22 is higher than that of the filter screen 21; thus, larger particles can be filtered through the filter screen 21, while finer particles can be filtered through the filter bag 22. Optionally, in this application, the filter bag 22 is made of non-woven fabric, which is easy to clean after removal and has low cost.

[0050] The filter screen 21 can be made of nylon or non-woven fabric. The pore size of the filter screen 21 is larger than that of the filter bag 22. The filter screen 21 is easier to clean than the filter bag 22. Therefore, the filter screen 21 does not need to be replaced when the filter bag 22 is replaced.

[0051] like Figure 1 As shown, the filter screen 21 can be formed into a plate-like structure in one process, and then the ends of the plate-like structure are connected to form a cylindrical filter screen 21, with the filter chamber 21a of the filter screen 21 being open from top to bottom.

[0052] like Figure 1 As shown, in the technical solution of this embodiment, the filter bag 22 includes a bag body 221 and a first water inlet cylinder 222. The bag body 221 includes a bottom bag 2211 and a cylindrical peripheral bag 2212. The bottom bag 2211 is connected to one end of the peripheral bag 2212 and together with the peripheral bag 2212 forms an open assembly cavity 221a. The filter screen 21 is detachably disposed in the assembly cavity 221a. The assembly cavity 221a of the bag body 221 is adapted to the filter screen 21. (Reference) Figure 1 By connecting the side pocket 2212 and the bottom pocket 2211, the bottom pocket 2211 can be placed against the lower part of the filter screen 21. Thus, during the assembly process of the filter pocket 22 and the filter screen 21, the filter screen 21 being in contact with the bottom pocket 2211 indicates that it is installed in place.

[0053] The bottom pocket 2211 is provided with a water passage hole 221b, which communicates with the assembly cavity 221a, that is, the water passage hole 221b communicates with the filter cavity 21a of the filter screen 21; the first water inlet cylinder 222 has a first water inlet channel; the first water inlet cylinder 222 is connected to the bottom pocket 2211 and is set corresponding to the water passage hole 221b so that the first water inlet channel communicates with the water passage hole 221b; the end of the first water inlet cylinder 222 away from the bottom pocket 2211 is detachably connected to the water inlet 1b on the bottom wall of the mounting cavity 1a. It can be understood that by connecting the first water inlet cylinder 222 to the water inlet 1b of the frame 1, the position of the first water inlet cylinder 222 can be fixed, and the water inlet 1b can communicate with the filter cavity 21a through the first water inlet channel, ensuring that the water flows smoothly into the filter cavity 21a, and then flows out after passing through the filter screen 21 and the filter pocket 22 in sequence, achieving the filtration and cleaning effect.

[0054] It should be noted that after the filter device 100 of this application is installed in the filter space of the underwater cleaning robot, the cover of the underwater cleaning robot presses onto the filter assembly 2, which will block the opening at the top of the filter screen 21, ensuring that the water flows out after filtration.

[0055] like Figure 2As shown, in the technical solution of this embodiment, the filter bag 22 further includes a second water inlet cylinder 223, which has a second water inlet channel 223a; the second water inlet cylinder 223 is located in the assembly cavity 221a; the second water inlet cylinder 223 is connected to the bottom bag 2211 and is provided corresponding to the water passage hole 221b, so that the second water inlet channel 223a communicates with the water passage hole 221b;

[0056] The second water inlet tube 223 is equipped with a counterweight component 224 at the end away from the bottom pocket 2211.

[0057] Understandably, when the underwater cleaning robot is working, the pump assembly drives the water flow, and the water flow has a certain water pressure. During the process of entering the filter chamber 21a from the inlet 1b, it will generate an impact force on the second inlet cylinder 223, which will drive the counterweight assembly 224 to move away from the bottom bag 2211, so as to achieve the purpose of driving the second inlet cylinder 223 to extend. At this time, the water flow can smoothly pass through the second inlet cylinder 223 and enter the filter chamber 21a.

[0058] When the underwater cleaning robot does not need to perform filtration, the pump assembly stops working. Without water pressure impact, the counterweight assembly 224 falls to the bottom pocket 2211 under its own weight, and drives the second water inlet tube 223 to cover the water passage hole 221b, which can prevent debris in the filter chamber 21a from falling out of the filter chamber 21a.

[0059] like Figure 1 and Figure 2 As shown, the first water inlet cylinder 222 is located outside the assembly cavity 221a, and the second water inlet cylinder 223 is located inside the assembly cavity 221a.

[0060] like Figure 2 As shown, in this embodiment, the counterweight assembly 224 includes two counterweight bars 2241 and an elastic limiting bar 2242. The two counterweight bars 2241 are positioned opposite each other at the end of the second water inlet cylinder 223 away from the bottom pocket 2211. One end of the elastic limiting bar 2242 is connected to one of the counterweight bars 2241, and the other end is connected to the bottom pocket 2211. Thus, the elastic limiting bar 2242 can restrict the falling direction of the counterweight bars 2241, ensuring that the second water inlet cylinder 223 tilts to one side, thereby ensuring that the second water inlet cylinder 223 can cover the water passage hole 221b. The design of two opposing counterweight bars 2241 ensures that after falling, they can compact the end of the second water inlet cylinder 223, preventing the second water inlet cylinder 223 from shaking and causing the water passage hole 221b to remain unsealed.

[0061] It is understandable that the elastic limit bar 2242 is elastic and can deform under the impact of water pressure. When the force generated by the water pressure impact disappears, the elastic limit bar 2242 returns to its original position, causing the counterweight bar 2241 to fall to one side.

[0062] like Figure 1 and Figure 3 As shown, in the technical solution of this embodiment, the frame 1 includes a frame 11 and a base plate 12. The base plate 12 is rotatably connected to one end of the frame 11 and forms an installation cavity 1a with the frame 11. The base plate 12 has a water inlet 1b. The first water inlet cylinder 222 is detachably connected to the base plate 12.

[0063] It is understandable that setting the base plate 12 to be rotatably connected to the frame 11 facilitates the installation of the first water inlet cylinder 222 and the base plate 12. After the filter bag 22 and the filter screen 21 are assembled to form the filter assembly 2, the filter assembly 2 is installed into the mounting cavity 1a of the frame 1. The base plate 12 is rotated to open in the direction away from the frame 11, which facilitates the assembly of the first water inlet cylinder 222 and the base plate 12. After the first water inlet cylinder 222 and the base plate 12 are assembled, the base plate 12 is rotated back in the opposite direction.

[0064] like Figure 3 As shown, the base plate 12 is provided with a rotating shaft 126, and the base plate 12 is rotatably connected to the frame 11 through the rotating shaft 126.

[0065] To improve the connection stability between the base plate 12 and the frame 11, the base plate 12 is also provided with a fastener 124, and the frame 11 is provided with a snap-fit ​​block 116. The base plate 12 and the frame 11 are stably connected by snapping the fastener 124 and the snap-fit ​​block 116.

[0066] In order to make it easier to separate the fastener 124 from the buckle block 116, a buckle handle 125 is provided on the fastener 124.

[0067] like Figure 1 and 3 As shown, in the technical solution of this embodiment, the bottom plate 12 has a mounting ring platform 121 protruding on the side facing the mounting cavity 1a, and the mounting ring platform 121 is arranged around the water inlet 1b; the peripheral wall of the mounting ring platform 121 has a retaining ring 122 protruding; the first water inlet cylinder 222 is connected to the bottom plate 12 at one end and has a first elastic ring 225, which is sleeved on the mounting ring platform 121 and engaged with the retaining ring 122.

[0068] It is understandable that the first water inlet cylinder 222 is connected to the base plate 12 through the first elastic ring 225. Furthermore, the design of the retaining ring 122 prevents the first elastic ring 225 from falling off, thus improving connection stability.

[0069] like Figure 1 and 3 As shown, in the technical solution of this embodiment, the mounting ring platform 121 is provided with at least two supporting members 123; after the first water inlet cylinder 222 is connected to the mounting ring platform 121, the supporting members 123 are located in the first water inlet channel.

[0070] Understandably, after the first water inlet cylinder 222 is installed on the mounting ring 121, the support member 123 can open the first water inlet cylinder 222 to ensure smooth water intake.

[0071] like Figure 1 As shown, in the technical solution of this embodiment, a second elastic ring 226 is provided at the end of the peripheral pocket 2212 away from the bottom pocket 2211. This facilitates the installation and removal of the filter pocket 22.

[0072] like Figure 1 As shown, in this embodiment, the frame 11 includes an upper frame 114, a frame strip 113, and a lower frame 115. The upper frame 114 and the lower frame 115 are spaced apart and connected by the frame strip 113. The lower frame 115 is rotatably connected to the base plate 12. The upper frame 114 is also rotatably connected to a handle 111 for easy lifting of the filter assembly 2. To improve the sealing between the cover and the filter assembly 2, the upper frame 114 is also provided with a sealing strip 112, which presses against the sealing strip 112 when the cover is pressed onto the filter assembly 2.

[0073] Secondly, this application also provides an underwater cleaning robot, including a cleaning robot body and the above-described filtration device 100. The specific structure of the filtration device 100 is as described in the above embodiments. Since this underwater cleaning robot adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The cleaning robot body has a filtration space; the filtration device 100 is installed within the filtration space.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; 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.

[0078] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0079] In the description of this specification, the references to terms such as "one 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. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0080] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0081] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A filtration device (100), characterized in that, include: The frame (1) has a mounting cavity (1a), and the bottom wall of the mounting cavity (1a) is provided with a water inlet (1b); A filter bag (22) is detachably disposed in the mounting cavity (1a); the filter bag (22) has an assembly cavity (221a); ​​the filter bag (22) is detachably connected to the bottom wall of the mounting cavity (1a) and is disposed corresponding to the water inlet (1b) so that the water inlet (1b) communicates with the assembly cavity (221a).

2. The filtration device (100) according to claim 1, characterized in that, The end of the filter bag (22) away from the water inlet (1b) is detachably connected to the frame; Alternatively, it may also include a filter screen (21) having a filter chamber (21a); ​​the filter screen (21) is disposed in the assembly chamber (221a), and the end of the filter pocket (22) away from the water inlet (1b) is detachably connected to the filter screen (21).

3. The filtration device (100) according to claim 2, characterized in that, The filter pocket (22) is provided with a second elastic ring (226) at the end away from the water inlet (1b), and is detachably connected to the frame (1) or the filter screen (21) through the second elastic ring (226).

4. The filtration device (100) according to claim 1, characterized in that, The filter bag (22) includes: The main body (221) includes a bottom pocket (2211) and a cylindrical peripheral pocket (2212); the bottom pocket (2211) is connected to one end of the peripheral pocket (2212) and together with the peripheral pocket (2212) forms an open assembly cavity (221a); ​​the bottom pocket (2211) is provided with a water passage hole (221b), which communicates with the assembly cavity (221a); The first water inlet tube (222) has a first water inlet channel; the first water inlet tube (222) is connected to the bottom pocket (2211) and is provided corresponding to the water passage hole (221b) so that the first water inlet channel communicates with the water passage hole (221b); the end of the first water inlet tube (222) away from the bottom pocket (2211) is detachably connected to the water inlet (1b) of the bottom wall of the mounting cavity (1a).

5. The filtration device (100) according to claim 4, characterized in that, The filter bag (22) further includes a second water inlet cylinder (223), which has a second water inlet channel (223a); the second water inlet cylinder (223) is located inside the assembly cavity (221a); ​​the second water inlet cylinder (223) is connected to the bottom bag (2211) and is provided corresponding to the water passage hole (221b) so that the second water inlet channel (223a) communicates with the water passage hole (221b); The second water inlet tube (223) is provided with a counterweight assembly (224) at the end away from the bottom bag (2211).

6. The filtration device (100) according to claim 5, characterized in that, The counterweight assembly (224) includes two counterweight bars (2241) and an elastic limiting bar (2242). The two counterweight bars (2241) are disposed opposite to each other at the end of the second water inlet tube (223) away from the bottom pocket (2211). One end of the elastic limiting bar (2242) is connected to one of the counterweight bars (2241), and the other end is connected to the bottom pocket (2211).

7. The filtration device (100) according to any one of claims 4 to 6, characterized in that, The frame (1) includes: Frame (11); The base plate (12) is rotatably connected to one end of the frame (11) and forms the mounting cavity (1a) with the frame (11); the base plate (12) has the water inlet (1b); the first water inlet cylinder (222) is detachably connected to the base plate (12).

8. The filtration device (100) according to claim 7, characterized in that, The base plate (12) has a mounting ring platform (121) protruding on the side facing the mounting cavity (1a), and the mounting ring platform (121) is arranged around the water inlet (1b); the peripheral wall of the mounting ring platform (121) has a retaining ring (122) protruding. The first water inlet cylinder (222) is connected to the bottom plate (12) at one end and is provided with a first elastic ring (225). The first elastic ring (225) is sleeved on the mounting ring platform (121) and snapped into the retaining ring (122).

9. The filtration device (100) according to claim 8, characterized in that, The mounting ring (121) is provided with at least two support members (123); after the first water inlet cylinder (222) is connected to the mounting ring (121), the support members (123) are located in the first water inlet channel.

10. An underwater cleaning robot, characterized in that, include: The cleaning robot itself has a filtration space; The filter device (100) as described in any one of claims 1 to 9 is installed within the filter space.

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